SEC Filing - United Airlines Holdings, Inc.

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Form 8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): June 26, 2007

UAL CORPORATION

(Exact name of registrant as specified in its charter)


Delaware	1-6033	36-2675207
(State of Incorporation)	(Commission File Number)	(IRS Employer Identification Number)

77 W. Wacker Drive, Chicago, IL 60601

(Address of principal executive offices)

Registrant’s telephone number, including area code: (312) 997-8000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written communications pursuant to Rule 425 under the Securities Act

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act

Item 1.01.

Entry into a Material Definitive Agreement.

On June 26, 2007, United Air Lines, Inc. (“United”) and Wilmington Trust Company, as subordination agent and pass through trustee under three pass through trusts newly formed by United (the “Trustee”) entered into the Note Purchase Agreement, dated as of June 26, 2007 (the “Note Purchase Agreement”). The Note Purchase Agreement provides for the issuance by United of equipment notes (the “Equipment Notes”) in the aggregate principal amount of $693,657,000 to finance thirteen aircraft owned by United. The payment obligations of United under the equipment notes are fully and unconditionally guaranteed by UAL Corporation (the “Company”). Pursuant to the Note Purchase Agreement, the Trustee for each pass through trust agreed to purchase Equipment Notes issued under a Trust Indenture and Mortgage (each, an “Indenture” and, collectively, the “Indentures”) with respect to each aircraft entered into by United and Wilmington Trust Company, as Mortgagee.

Each Indenture contemplates the issuance of Equipment Notes in three series: Series A, bearing interest at the rate of 6.636% per annum, Series B, bearing interest at the rate of 7.336% per annum, and Series C, bearing interest at the rate of Six-Month LIBOR plus 2.25% per annum, in the aggregate principal amount equal to $485,086,000, in the case of Series A Equipment Notes, $106,835,000 in the case of Series B Equipment Notes, and $101,736,000, in the case of Series C Equipment Notes. The Equipment Notes will be purchased by the Trustee for each pass through trust using the proceeds from the sale of Pass Through Certificates, Series 2007-1A, Pass Through Certificates, Series 2007-1B, and Pass Through Certificates, Series 2007-1C (collectively, the “Certificates”).

The interest on the Equipment Notes is payable semiannually on each January 2 and July 2, beginning on January 2, 2008. The principal payments on the Equipment Notes are scheduled on January 2 and July 2 in certain years, beginning on January 2, 2008. The final payments will be due on July 2, 2022, in the case of the Series A Equipment Notes, July 2, 2019, in the case of the Series B Equipment Notes, and July 2, 2014, in the case of the Series C Equipment Notes. Maturity of the Equipment Notes may be accelerated upon the occurrence of certain Events of Default, including failure by United to make payments under the applicable Indenture when due or to comply with certain covenants, as well as certain bankruptcy events involving United. The Equipment Notes issued with respect to each aircraft will be secured by a lien on such aircraft and will also be cross-collateralized by the other aircraft financed pursuant to the Note Purchase Agreement.

The Certificates were registered for offer and sale pursuant to the Securities Act of 1933, as amended (the “Securities Act”), under the Company’s automatic shelf registration statement on Form S-3 (File No. 333-143865) (the “Registration Statement”). For a more detailed description of the agreements and instruments entered into by United with respect to the Certificates, see the disclosure under the captions “Description of the Certificates”, “Description of the Liquidity Facilities for Class A and B Certificates”, “Description of the Intercreditor Agreement”, “Description of the Equipment Notes” and “Underwriting” contained in the Company’s final Prospectus Supplement, dated June 19, 2007 (the “Prospectus Supplement”), to the Prospectus, dated June 19, 2007, filed with the Securities and Exchange Commission on June 21, 2007 pursuant to Rule 424(b) under the Securities Act, which disclosure is hereby incorporated herein by reference.

This Current Report is also being filed for the purpose of filing as exhibits to the Registration Statement the documents listed in Item 9.01 below, which are hereby incorporated by reference in the Registration Statement.

Item 2.03.

Creation of Direct Financial Obligation.

See Item 1.01.

Item 9.01.

Financial Statements and Exhibits.

(d) Exhibits. The Exhibit Index attached to this Current Report is hereby incorporated by reference. The documents listed on the Exhibit Index are filed as Exhibits with reference to the Registration Statement. The Registration Statement and the final Prospectus Supplement, dated June 19, 2007, to the Prospectus, dated June 19, 2007, relate to the offering of the Certificates.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.


UAL CORPORATION

By:	/s/ Frederic F. Brace
	Name:	Frederic F. Brace
	Title:	Executive Vice President and Chief Financial Officer

Date: June 27, 2007

EXHIBIT INDEX


Exhibit No.		Description
1.1		Underwriting Agreement, dated June 19, 2007, between Morgan Stanley & Co. Incorporated, Credit Suisse Securities (USA) LLC, United Air Lines, Inc. and UAL Corporation (filed as Exhibit 1.1 to the Company’s Current Report on Form 8-K dated June 19, 2007 (filed with the SEC on June 21, 2007) and incorporated herein by reference)

4.4*		Pass Through Trust Agreement, dated as of June 26, 2007, between Wilmington Trust Company, as Trustee, and United Air Lines, Inc.

4.5*		Trust Supplement No. 2007-1A, dated as of June 26, 2007, between Wilmington Trust Company, as Trustee, and United Air Lines, Inc. to Pass Through Trust Agreement, dated as of June 26, 2007

4.6*		Trust Supplement No. 2007-1B, dated as of June 26, 2007, between Wilmington Trust Company, as Trustee, and United Air Lines, Inc. to Pass Through Trust Agreement, dated as of June 26, 2007

4.7*		Trust Supplement No. 2007-1C, dated as of June 26, 2007, between Wilmington Trust Company, as Trustee, and United Air Lines, Inc. to Pass Through Trust Agreement, dated as of June 26, 2007

4.8*		Revolving Credit Agreement (2007-1A), dated as of June 26, 2007, between Wilmington Trust Company, as Subordination Agent, as Agent and Trustee for the United Air Lines Pass Through Trust 2007-1A, as Borrower, and Morgan Stanley Senior Funding, Inc., as Liquidity Provider

4.9*		Revolving Credit Agreement (2007-1B), dated as of June 26, 2007, between Wilmington Trust Company, as Subordination Agent, as Agent and Trustee for the United Air Lines Pass Through Trust 2007-1B, as Borrower, and Morgan Stanley Senior Funding, Inc., as Liquidity Provider

4.10*		Morgan Stanley Liquidity Facility Guarantee, dated June 26, 2007

4.11*		Intercreditor Agreement, dated as of June 26, 2007, among Wilmington Trust Company, as Trustee, Morgan Stanley Senior Funding, Inc., as Liquidity Provider, and Wilmington Trust Company, as Subordination Agent and Trustee

4.12*		Note Purchase Agreement, dated as of June 26, 2007, among United Air Lines, Inc., Wilmington Trust Company, as Pass Through Trustee under each of the Pass Through Trust Agreements, and Wilmington Trust Company, as Subordination Agent

4.13*		Form of Participation Agreement (Participation Agreement between United Air Lines, Inc. and Wilmington Trust Company, as Mortgagee, Subordination Agent and Pass Through Trustee)

4.14*		Form of Indenture (Trust Indenture and Mortgage between United Air Lines, Inc. and Wilmington Trust Company, as Mortgagee)

4.15*		Form of United Air Lines, Inc. Pass Through Certificate, Series 2007-1A (included in Exhibit 4.5)

4.16*		Form of United Air Lines, Inc. Pass Through Certificate, Series 2007-1B (included in Exhibit 4.6)

4.17*		Form of United Air Lines, Inc. Pass Through Certificate, Series 2007-1C (included in Exhibit 4.7)

4.18*		UAL Corporation Guarantee, dated June 26, 2007

99.1*		Schedule I (1)

*	Filed herewith electronically

(1)

Documents substantially identical in all material respects to those filed as Exhibits 4.13 and 4.14 hereto have been entered into with respect to each aircraft. Pursuant to Instruction 2 of Item 601 of Regulation S-K, Exhibit 99.1 hereto sets forth the terms whereby such substantially identical documents differ from those filed as Exhibit 4.13 and 4.14 hereto.

Pass Through Trust Agreement, dated as of June 26, 2007

Exhibit 4.4

PASS THROUGH TRUST AGREEMENT

dated as of June 26, 2007

between

UNITED AIR LINES, INC.

and

WILMINGTON TRUST COMPANY,

as Trustee

Vedder, Price, Kaufman & Kammholz, P.C.

Chicago, Illinois

TABLE OF CONTENTS


		Page
ARTICLE I	DEFINITIONS	2

Section 1.01.	Definitions	2
Section 1.02.	Compliance Certificates and Opinions	9
Section 1.03.	Form of Documents Delivered to Trustee	10
Section 1.04.	Directions of Certificateholders	10

ARTICLE II	ORIGINAL ISSUANCE OF CERTIFICATES: ACQUISITION OF TRUST PROPERTY	12

Section 2.01.	Amount Unlimited; Issuable in Series	12
Section 2.02.	Acquisition of Equipment Notes	14
Section 2.03.	Acceptance by Trustee	14
Section 2.04.	Limitation of Powers	14

ARTICLE III	THE CERTIFICATES	14

Section 3.01.	Form, Denomination and Execution of Certificates	14
Section 3.02.	Authentication of Certificates	15
Section 3.03.	Temporary Certificates	15
Section 3.04.	Transfer and Exchange	16
Section 3.05.	Book-Entry and Definitive Certificates	16
Section 3.06.	Mutilated, Destroyed, Lost or Stolen Certificates	18
Section 3.07.	Persons Deemed Owners	19
Section 3.08.	Cancellation	19
Section 3.09.	Limitation of Liability for Payments	19

ARTICLE IV	DISTRIBUTIONS; STATEMENTS TO CERTIFICATEHOLDERS	20

Section 4.01.	Certificate Account and Special Payments Account	20
Section 4.02.	Distributions from Certificate Account and Special Payments Account	20
Section 4.03.	Statements to Certificateholders	22
Section 4.04.	Investment of Special Payment Moneys	23

ARTICLE V	THE COMPANY	23

Section 5.01.	Maintenance of Corporate Existence	23
Section 5.02.	Consolidation, Merger, Etc	23

ARTICLE VI	DEFAULT	24

Section 6.01.	Events of Default	24
Section 6.02.	Incidents of Sale of Equipment Notes	25
Section 6.03.	Judicial Proceedings Instituted by Trustee; Trustee May Bring Suit	26
Section 6.04.	Control by Certificateholders	26
Section 6.05.	Waiver of Past Defaults	27

TABLE OF CONTENTS

(continued)


		Page
Section 6.06.	Right of Certificateholders to Receive Payments Not to Be Impaired	27
Section 6.07.	Certificateholders May Not Bring Suit Except Under Certain Conditions	27
Section 6.08.	Remedies Cumulative	28
Section 6.09.	Undertaking for Costs	28

ARTICLE VII	THE TRUSTEE	28

Section 7.01.	Certain Duties and Responsibilities	28
Section 7.02.	Notice of Defaults	29
Section 7.03.	Certain Rights of Trustee	29
Section 7.04.	Not Responsible for Recitals or Issuance of Certificates	30
Section 7.05.	May Hold Certificates	31
Section 7.06.	Money Held in Trust	31
Section 7.07.	Compensation and Reimbursement	31
Section 7.08.	Corporate Trustee Required; Eligibility	32
Section 7.09.	Resignation and Removal; Appointment of Successor	32
Section 7.10.	Acceptance of Appointment by Successor	33
Section 7.11.	Merger, Conversion, Consolidation or Succession to Business	34
Section 7.12.	Maintenance of Agencies	34
Section 7.13.	Money for Certificate Payments to be Held in Trust	36
Section 7.14.	Registration of Equipment Notes in Trustee’s Name	36
Section 7.15.	Representations and Warranties of Trustee	36
Section 7.16.	Withholding Taxes; Information Reporting	37
Section 7.17.	Trustee’s Liens	37
Section 7.18.	Preferential Collection of Claims	38

ARTICLE VIII	CERTIFICATEHOLDERS’ LISTS AND REPORTS BY TRUSTEE	38

Section 8.01.	The Company to Furnish Trustee with Names and Addresses of Certificateholders	38
Section 8.02.	Preservation of Information; Communications to Certificateholders	38
Section 8.03.	Reports by Trustee	38
Section 8.04.	Reports by the Company	38

ARTICLE IX	SUPPLEMENTAL AGREEMENTS	39

Section 9.01.	Supplemental Agreements Without Consent of Certificateholders	39
Section 9.02.	Supplemental Agreements with Consent of Certificateholders	41
Section 9.03.	Documents Affecting Immunity or Indemnity	42
Section 9.04.	Execution of Supplemental Agreements	42
Section 9.05.	Effect of Supplemental Agreements	42
Section 9.06.	Conformity with Trust Indenture Act	42

TABLE OF CONTENTS

(continued)


		Page
Section 9.07.	Reference in Certificates to Supplemental Agreements	42

ARTICLE X	AMENDMENTS TO INDENTURE AND NOTE DOCUMENTS	43

Section 10.01.	Amendments and Supplements to Indenture and other Note Documents	43

ARTICLE XI	TERMINATION OF TRUSTS	44

Section 11.01.	Termination of the Trusts	44

ARTICLE XII	MISCELLANEOUS PROVISIONS	45

Section 12.01.	Limitation on Rights of Certificateholders	45
Section 12.02.	Liabilities of Certificateholders	45
Section 12.03.	Registration of Equipment Notes in Name of Subordination Agent	45
Section 12.04.	Notices	45
Section 12.05.	Governing Law	46
Section 12.06.	Severability of Provisions	47
Section 12.07.	Trust Indenture Act Controls	47
Section 12.08.	Effect of Headings and Table of Contents	47
Section 12.09.	Successors and Assigns	47
Section 12.10.	Benefits of Agreement	47
Section 12.11.	Legal Holidays	47
Section 12.12.	Counterparts	47
Section 12.13.	Communication by Certificateholders with other Certificateholders	47
Section 12.14.	Intention of Parties	48

iii

Reconciliation and tie between United Air Lines Pass Through Trust Agreement, dated as of June 26, 2007 and the Trust Indenture Act of 1939. This reconciliation does not constitute part of the Pass Through Trust Agreement.


Trust Indenture Act of 1939 Section		Pass Through Trust Agreement Section
310(a)(1)		7.08
(a)(2)		7.08
312(a)		3.05; 8.01; 8.02
313(a)		8.03
314(a)		8.04(a) - (c)
(a)(4)		8.04(d)
(c)(1)		1.02
(c)(2)		1.02
(e)		1.02
315(b)		7.02
316(a)(last sentence)		1.01
(a)(1)(A)		6.04
(a)(1)(B)		6.05
(b)		6.06
(c)		1.04(d)
317(a)(1)		6.03
(b)		7.13
318(a)		12.05

PASS THROUGH TRUST AGREEMENT

This PASS THROUGH TRUST AGREEMENT, dated as of June 26, 2007 (the “Basic Agreement”), between UNITED AIR LINES, INC., a Delaware corporation (the “Company”), and WILMINGTON TRUST COMPANY, a Delaware trust company, as Trustee, is made with respect to the formation from time to time of separate United Air Lines Pass Through Trusts, and the issuance from time to time of separate series of Pass Through Certificates representing fractional undivided interests in the respective Trusts.

W I T N E S S E T H:

WHEREAS, from time to time, the Company and the Trustee may enter into a Trust Supplement (this and certain other defined terms used herein are defined in Section 1.01) pursuant to which the Trustee shall declare the creation of a separate Trust for the benefit of the Holders of the series of Certificates to be issued in respect of such Trust, and the initial Holders of the Certificates of such series, as the grantors of such Trust, by their respective acceptances of the Certificates of such series, shall join in the creation of such Trust with the Trustee;

WHEREAS, all Certificates to be issued in respect of each separate Trust will be issued as a separate series pursuant to this Agreement, will evidence fractional undivided interests in such Trust and will have no rights, benefits or interests in respect of any other separate Trust or the property held therein, subject, however, to the provisions of any Intercreditor Agreement to which one or more Trusts may be a party;

WHEREAS, from time to time, pursuant to the terms and conditions of this Agreement with respect to each separate Trust formed hereunder, the Trustee on behalf of such Trust shall purchase one or more issues of Equipment Notes having the same interest rate as, and final maturity dates not later than the final Regular Distribution Date of, the series of Certificates issued in respect of such Trust and, subject to the terms of any related Intercreditor Agreement, shall hold such Equipment Notes in trust for the benefit of the Certificateholders of such Trust;

WHEREAS, to facilitate the sale of Equipment Notes to, and the purchase of Equipment Notes by, the Trustee on behalf of each Trust created from time to time pursuant to this Agreement, the Company as the “issuer”, as such term is defined in and solely for purposes of the Securities Act of 1933, as amended, of the Certificates to be issued in respect of each Trust and as the “obligor”, as such term is defined in and solely for purposes of the Trust Indenture Act of 1939, as amended, has duly authorized the execution and delivery of this Basic Agreement and each Trust Supplement with respect to all such Certificates and is undertaking to perform certain administrative and ministerial duties hereunder and is also undertaking to pay the fees and expenses of the Trustee; and

WHEREAS, this Basic Agreement, as supplemented from time to time, is subject to the provisions of the Trust Indenture Act of 1939, as amended, and shall, to the extent applicable, be governed by such provisions;

NOW, THEREFORE, in consideration of the mutual agreements herein contained, and of other good and valuable consideration the receipt and adequacy of which are hereby acknowledged, the parties hereto agree as follows:

[Pass Through Trust Agreement]

ARTICLE I

DEFINITIONS

Section 1.01. Definitions. For all purposes of this Basic Agreement, except as otherwise expressly provided or unless the context otherwise requires:

(1) the terms used herein that are defined in this Article I have the meanings assigned to them in this Article I, and include the plural as well as the singular;

(2) all other terms used herein which are defined in the Trust Indenture Act, either directly or by reference therein, or by the rules promulgated under the Trust Indenture Act, have the meanings assigned to them therein;

(3) all references in this Basic Agreement to designated “Articles”, “Sections”, “Subsections” and other subdivisions are to the designated Articles, Sections, Subsections and other subdivisions of this Basic Agreement;

(4) the words “herein”, “hereof” and “hereunder” and other words of similar import refer to this Basic Agreement as a whole and not to any particular Article, Section, Subsection or other subdivision;

(5) unless the context otherwise requires, whenever the words “including”, “include” or “includes” are used herein, it shall be deemed to be followed by the phrase “without limitation”; and

(6) the term “this Agreement” (as distinguished from “this Basic Agreement”) refers, unless the context otherwise requires, to this Basic Agreement as supplemented by the Trust Supplement creating a particular Trust and establishing the series of Certificates issued or to be issued in respect thereof, with reference to such Trust and such series of Certificates, as this Basic Agreement as so supplemented may be further supplemented with respect to such Trust and such series of Certificates.

Act: Has the meaning, with respect to any Certificateholder, specified in Section 1.04(a).

Affiliate: Means, with respect to any specified Person, any other Person directly or indirectly controlling or controlled by or under direct or indirect common control with such Person. For the purposes of this definition, “control”, when used with respect to any specified Person, means the power, directly or indirectly, to direct the management and policies of such Person, whether through the ownership of voting securities or by contract or otherwise, and the terms “controlling” and “controlled” have meanings correlative to the foregoing.

Aircraft: Means one or more aircraft, including engines therefor, owned by the Company and securing one or more Equipment Notes.

[Pass Through Trust Agreement]

Authorized Agent: Means, with respect to the Certificates of any series, any Paying Agent or Registrar for the Certificates of such series.

Avoidable Tax: Means a state or local tax: (i) upon (w) a Trust, (x) Trust Property, (y) Certificateholders or (z) a Trustee for which such Trustee is entitled to seek reimbursement from Trust Property, and (ii) which would be avoided if the Trustee were located in another state, or jurisdiction within a state, within the United States of America. A tax shall not be an Avoidable Tax in respect of any Trust if the Company shall agree to pay, and shall pay, such tax.

Basic Agreement: Means this Pass Through Trust Agreement, as the same may from time to time be supplemented, amended or modified, but does not include any Trust Supplement.

Book-Entry Certificates: Means, with respect to the Certificates of any series, a beneficial interest in the Certificates of such series, ownership and transfers of which shall be made through book entries as described in Section 3.05.

Break Amount: Has the meaning set forth in any Intercreditor Agreement.

Business Day: Means, with respect to the Certificates of any series, any day other than a Saturday, a Sunday or a day on which commercial banks are required or authorized to close in Chicago, Illinois, New York, New York, or, so long as any Certificate of such series is outstanding, the city and state in which the Trustee or any related Loan Trustee maintains its Corporate Trust Office or receives and disburses funds.

Certificate: Means any one of the certificates executed and authenticated by the Trustee, substantially in the form attached to the Trust Supplement establishing such series of Certificates.

Certificate Account: Means, with respect to the Certificates of any series, the account or accounts created and maintained for such series pursuant to Section 4.01(a) and the related Trust Supplement.

Certificateholder or Holder: Means, with respect to the Certificates of any series, the Person in whose name a Certificate of such series is registered in the Register for Certificates of such series.

Certificate Owner: Means, with respect to the Certificates of any series, for purposes of Section 3.05, the Person who owns a Book-Entry Certificate of such series.

Clearing Agency: Means an organization registered as a “clearing agency” pursuant to Section 17A of the Securities Exchange Act of 1934, as amended.

Clearing Agency Participant: Means a broker, dealer, bank, other financial institution or other Person for whom from time to time a Clearing Agency effects, directly or indirectly, book-entry transfers and pledges of securities deposited with the Clearing Agency.

[Pass Through Trust Agreement]

Closing Date: Has the meaning assigned to that term in a Note Purchase Agreement, and in any event refers to any such date as it may be changed from time to time in accordance with the terms of such Note Purchase Agreement.

Company: Means United Air Lines, Inc., a Delaware corporation, or its successor in interest pursuant to Section 5.02, or (only in the context of provisions hereof, if any, when such reference is required for purposes of compliance with the Trust Indenture Act) any other “obligor” (within the meaning of the Trust Indenture Act) with respect to the Certificates of any series.

Controlling Party: Means the Person entitled to act as such pursuant to the terms of any Intercreditor Agreement.

Corporate Trust Office: Means, with respect to the Trustee or any Loan Trustee, the office of such trustee in the city at which at any particular time its corporate trust business shall be principally administered.

Cut-off Date: Means, with respect to the Certificates of any series, the date designated as such in the Trust Supplement establishing such series.

Definitive Certificates: Has the meaning, with respect to the Certificates of any series, specified in Section 3.05.

Direction: Has the meaning specified in Section 1.04(a).

Distribution Date: Means any Regular Distribution Date or Special Distribution Date as the context requires.

Equipment Notes: Means, with respect to the Certificates of any series, all of the equipment notes issued under the Indentures related to such series of Certificates.

ERISA: Means the Employee Retirement Income Security Act of 1974, as amended from time to time, or any successor federal statute.

Event of Default: Means, in respect of any Trust, an Indenture Event of Default under any Indenture pursuant to which Equipment Notes held by such Trust were issued.

Fractional Undivided Interest: Means the fractional undivided interest in a Trust that is evidenced by a Certificate relating to such Trust.

Indenture: Means, with respect to any Trust, each of the one or more separate trust indenture and security agreements or trust indenture and mortgages or similar documents described in, or on a schedule attached to, the Note Purchase Agreement, as each such indenture may be amended or supplemented in accordance with its respective terms; and “Indentures” means all of such agreements.

[Pass Through Trust Agreement]

Indenture Event of Default: Means, with respect to any Indenture, any Indenture Event of Default (as such term is defined in such Indenture).

Initial Regular Distribution Date: Means, with respect to the Certificates of any series, the first Regular Distribution Date on which a Scheduled Payment is to be made.

Intercreditor Agreement: Means any agreement by and among the Trustee, as trustee hereunder with respect to one or more Trusts, one or more Liquidity Providers and a Subordination Agent providing, among other things, for the distribution of payments made in respect of Equipment Notes held by such Trusts.

Issuance Date: Means, with respect to the Certificates of any series, the date of the issuance of such Certificates.

Letter of Representations: Means, with respect to the Certificates of any series, an agreement among the Company, the Trustee and the initial Clearing Agency.

Liquidity Facility: Means, with respect to the Certificates of any series, any revolving credit agreement, letter of credit or similar facility relating to the Certificates of such series between a bank or other financial institution and a Subordination Agent, as amended, replaced, supplemented or otherwise modified from time to time in accordance with its terms and the terms of any Intercreditor Agreement.

Liquidity Provider: Means, with respect to the Certificates of any series, a bank or other financial institution that agrees to provide a Liquidity Facility for the benefit of the holders of Certificates of such series.

Loan Trustee: Means, with respect to any Equipment Note or the Indenture applicable thereto, the bank or trust company designated as loan or indenture trustee under such Indenture, and any successor to such Loan Trustee as such trustee; and “Loan Trustees” means all of the Loan Trustees under the Indentures.

Note Documents: Means, with respect to the Certificates of any series, the Equipment Notes with respect to such Certificates and, with respect to such Equipment Notes, the related Indenture, the related Participation Agreement, the related Note Purchase Agreement and if the Equipment Notes are guaranteed by the Parent, the related Parent Guarantee.

Note Purchase Agreement: Means, with respect to the Certificates of any series, any note purchase, refunding, participation or similar agreement providing for, among other things, the purchase of Equipment Notes by the Trustee on behalf of the relevant Trust; and Note Purchase Agreements means all such agreements.

Officer’s Certificate: Means a certificate signed, (a) in the case of the Company, by the Chairman or Vice Chairman of the Board of Directors, the President, any Vice President or the Treasurer of the Company, signing alone, or (b) in the case of the Trustee or an Owner Trustee or a Loan Trustee, a Responsible Officer of the Trustee or such Owner Trustee or such Loan Trustee, as the case may be.

[Pass Through Trust Agreement]

Opinion of Counsel: Means a written opinion of legal counsel who (a) in the case of counsel for the Company may be (i) a senior attorney of the Company one of whose principal duties is furnishing advice as to legal matters, (ii) Vedder, Price, Kaufman & Kammholz, P.C., (iii) Cravath, Swaine & Moore or (iv) such other counsel designated by the Company and reasonably acceptable to the Trustee and (b) in the case of any Loan Trustee, may be such counsel as may be designated by any of them whether or not such counsel is an employee of any of them, and who shall be reasonably acceptable to the Trustee.

Other Agreements: Has the meaning specified in Section 6.01(b).

Outstanding: When used with respect to Certificates of any series, means, as of the date of determination, all Certificates of such series theretofore authenticated and delivered under this Agreement, except:

(i) Certificates of such series theretofore cancelled by the Registrar or delivered to the Trustee or the Registrar for cancellation;

(ii) All of the Certificates of such series if money in the full amount required to make the final distribution with respect to such series pursuant to Section 11.01 hereof has been theretofore deposited with the Trustee in trust for the Holders of the Certificates of such series as provided in Section 4.01 pending distribution of such money to such Certificateholders pursuant to payment of such final distribution payment; and

(iii) Certificates of such series in exchange for or in lieu of which other Certificates of such series have been authenticated and delivered pursuant to this Agreement.

Parent Guarantor: Means, UAL Corporation, a Delaware corporation, or its successor and assigns.

Parent Guarantee: Means, with respect to any Equipment Note, the guarantee thereof pursuant to the terms of the related Indenture or pursuant to the terms of a separate guarantee agreement, as such guarantee or guarantee agreement may be amended, supplemented or otherwise modified in accordance with its terms.

Participation Agreement: With respect to an Aircraft, means the Participation Agreement referred to in the related Indenture.

Paying Agent: Means, with respect to the Certificates of any series, the paying agent maintained and appointed for the Certificates of such series pursuant to Section 7.12.

[Pass Through Trust Agreement]

Permitted Investments: Means obligations of the United States of America or agencies or instrumentalities thereof for the payment of which the full faith and credit of the United States of America is pledged, maturing in not more than 60 days after the date of acquisition thereof or such lesser time as is required for the distribution of any Special Payments on a Special Distribution Date.

Person: Means any person, including any individual, corporation, limited liability company, partnership, joint venture, association, joint-stock company, trust, trustee, unincorporated organization, or government or any agency or political subdivision thereof.

Pool Balance: Means, with respect to each Trust or the Certificates of any series as of any date, (i) the original aggregate face amount of the Certificates of such series less (ii) the aggregate amount of all payments made in respect of such Certificates other than payments made in respect of interest, Break Amount or premium thereon or reimbursement of any costs or expenses incurred in connection therewith. The Pool Balance as of any Distribution Date shall be computed after giving effect to the payment of principal, if any, on the Equipment Notes or other Trust Property held in the Trust and the distribution thereof to be made on such Distribution Date.

Pool Factor: Means, with respect to any series of Certificates as of any date, the quotient (rounded to the seventh decimal place) computed by dividing (i) the Pool Balance of such series as at such date by (ii) the original aggregate face amount of the Certificates of such series. The Pool Factor as of any Distribution Date shall be computed after giving effect to the payment of principal, if any, on the Equipment Notes or other Trust Property held in the Trust and the distribution thereof to be made on such Distribution Date.

Potential Purchaser: Has the meaning, with respect to any Certificateholder, specified in Section 6.01(b).

Purchasing Certificateholder: Has the meaning, with respect to any Certificateholder, specified in Section 6.01(b).

Record Date: Means, with respect to any Trust or the related series of Certificates, (i) for Scheduled Payments to be distributed on any Regular Distribution Date, other than the final distribution with respect to such series, the 15th day (whether or not a Business Day) preceding such Regular Distribution Date, and (ii) for Special Payments to be distributed on any Special Distribution Date, other than the final distribution with respect to such series, the 15th day (whether or not a Business Day) preceding such Special Distribution Date.

Register and Registrar: Means, each with respect to the Certificates of any series, the register maintained and the registrar appointed pursuant to Sections 3.04 and 7.12.

Regular Distribution Date: Means, with respect to distributions of Scheduled Payments in respect of any series of Certificates, each date designated as such in such Certificates, until payment of all the Scheduled Payments to be made under the Equipment Notes held in the related Trust have been made; provided, that if any such day is not a Business Day, the related distribution shall be made on the next succeeding Business Day.

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Request: Means a request by the Company setting forth the subject matter of the request accompanied by an Officer’s Certificate and an Opinion of Counsel as provided in Section 1.02 of this Basic Agreement.

Responsible Officer: Means, with respect to any Trustee, any Loan Trustee and any Owner Trustee, any officer in the corporate trust department of the Trustee, Loan Trustee or Owner Trustee or any other officer customarily performing functions similar to those performed by the persons who at the time shall be such officers, respectively, or to whom any corporate trust matter is referred because of his knowledge of and familiarity with a particular subject.

Responsible Party: Means, with respect to the Certificates of any series, the Company.

Scheduled Payment: Means, with respect to any Equipment Note, (i) any payment of principal or interest on such Equipment Note (other than any such payment which is not in fact received by the Trustee or any Subordination Agent within ten (10) Business Days of the date on which such payment is scheduled to be made) or (ii) any payment of interest on the Certificates of any series with funds drawn under the Liquidity Facility for such series, which payment represents the installment of principal on such Equipment Note at the stated maturity of such installment, the payment of regularly scheduled interest accrued on the unpaid principal amount of such Equipment Note, or both; provided, however, that any payment of principal, Break Amount, premium, if any, or interest resulting from the redemption or purchase of any Equipment Note shall not constitute a Scheduled Payment.

SEC: Means the Securities and Exchange Commission, as from time to time constituted or created under the Securities Exchange Act of 1934, as amended, or, if at any time after the execution of this instrument such Commission is not existing and performing the duties now assigned to it under the Trust Indenture Act, then the body performing such duties on such date.

Selling Certificateholder: Has the meaning, with respect to any Certificateholder, specified in Section 6.01(b).

Special Distribution Date: Means, with respect to the Certificates of any series, each date on which a Special Payment is to be distributed as specified in this Agreement; provided, that if any such day is not a Business Day, the related distribution shall be made on the next succeeding Business Day.

Special Payment: Means any payment (other than a Scheduled Payment) in respect of, or any proceeds of, any Equipment Note or Trust Indenture Estate (as defined in each Indenture).

Special Payments Account: Means, with respect to the Certificates of any series, the account or accounts created and maintained for such series pursuant to Section 4.01(b) and the related Trust Supplement.

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Subordination Agent: Has the meaning specified therefor in any Intercreditor Agreement.

Triggering Event: Has the meaning specified therefor in any Intercreditor Agreement.

Trust: Means, with respect to the Certificates of any series, the trust under this Agreement.

Trustee: Means Wilmington Trust Company, or its successor in interest, and any successor or other trustee appointed as provided herein.

Trust Indenture Act: Except as otherwise provided in Section 9.06, means, with respect to any particular Trust, the United States Trust Indenture Act of 1939, as in force at the date as of which the related Trust Supplement was executed.

Trust Property: Means, with respect to any Trust, (i) subject to any related Intercreditor Agreement, the Equipment Notes held as the property of such Trust, the related Parent Guarantee, if any, all monies at any time paid thereon and all monies due and to become due thereunder, (ii) funds from time to time deposited in the related Certificate Account and the related Special Payments Account and, subject to the related Intercreditor Agreement, any proceeds from the sale by the Trustee pursuant to Article VI hereof of any such Equipment Note, (iii) all rights of such Trust and the Trustee, on behalf of the Trust, under any Intercreditor Agreement or Note Purchase Agreement, including, without limitation, all monies receivable in respect of such rights, and (iv) all monies receivable under any Liquidity Facility for such Trust.

Trust Supplement: Means an agreement supplemental hereto pursuant to which (i) a separate Trust is created for the benefit of the Holders of the Certificates of a series, (ii) the issuance of the Certificates of such series representing fractional undivided interests in such Trust is authorized and (iii) the terms of the Certificates of such series are established.

Section 1.02. Compliance Certificates and Opinions. Upon any application or request by the Company or any Loan Trustee to the Trustee to take any action under any provision of this Basic Agreement or, in respect of the Certificates of any series, this Agreement, the Company or such Loan Trustee, as the case may be, shall furnish to the Trustee (i) an Officer’s Certificate stating that, in the opinion of the signers, all conditions precedent, if any, provided for in this Basic Agreement or this Agreement relating to the proposed action have been complied with and (ii) an Opinion of Counsel stating that in the opinion of such counsel all such conditions precedent, if any, have been complied with, except that in the case of any such application or request as to which the furnishing of such documents is specifically required by any provision of this Basic Agreement or this Agreement relating to such particular application or request, no additional certificate or opinion need be furnished.

Every certificate or opinion with respect to compliance with a condition or covenant provided for in this Basic Agreement or, in respect of the Certificates of any series, this Agreement (other than a certificate provided pursuant to Section 8.04(d)) or any Trust Supplement shall include:

(1) a statement that each individual signing such certificate or opinion has read such covenant or condition and the definitions in this Basic Agreement or this Agreement relating thereto;

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(2) a brief statement as to the nature and scope of the examination or investigation upon which the statements or opinions contained in such certificate or opinion are based;

(3) a statement that, in the opinion of each such individual, he has made such examination or investigation as is necessary to enable him to express an informed opinion as to whether or not such covenant or condition has been complied with; and

(4) a statement as to whether, in the opinion of each such individual, such condition or covenant has been complied with.

Section 1.03. Form of Documents Delivered to Trustee. In any case where several matters are required to be certified by, or covered by an opinion of, any specified Person, it is not necessary that all such matters be certified by, or covered by the opinion of, only one such Person, or that they be so certified or covered by only one document, but one such Person may certify or give an opinion with respect to some matters and one or more other such Persons as to other matters and any such Person may certify or give an opinion as to such matters in one or several documents.

Where any Person is required to make, give or execute two or more applications, requests, consents, certificates, statements, opinions or other instruments under this Basic Agreement or, in respect of the Certificates of any series, this Agreement, they may, but need not, be consolidated and form one instrument.

Section 1.04. Directions of Certificateholders. (a) Any direction, consent, request, demand, authorization, notice, waiver or other action provided by this Agreement in respect of the Certificates of any series to be given or taken by Certificateholders (a “Direction”) may be embodied in and evidenced by one or more instruments of substantially similar tenor signed by such Certificateholders in person or by an agent or proxy duly appointed in writing; and, except as herein otherwise expressly provided, such action shall become effective when such instrument or instruments are delivered to the Trustee and, when it is hereby expressly required pursuant to this Agreement, to the Company or any Loan Trustee. Such instrument or instruments (and the action embodied therein and evidenced thereby) are herein sometimes referred to as the “Act” of the Certificateholders signing such instrument or instruments. Proof of execution of any such instrument or of a writing appointing any such agent or proxy shall be sufficient for any purpose of this Trust Agreement and conclusive in favor of the Trustee, the Company and the related Loan Trustee, if made in the manner provided in this Section 1.04.

(b) The fact and date of the execution by any Person of any such instrument or writing may be proved by the certificate of any notary public or other officer of any jurisdiction authorized to take acknowledgments of deeds or administer oaths that the Person executing such

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instrument acknowledged to him the execution thereof, or by an affidavit of a witness to such execution sworn to before any such notary or such other officer, and where such execution is by an officer of a corporation or association or a member of a partnership, on behalf of such corporation, association or partnership, such certificate or affidavit shall also constitute sufficient proof of his authority. The fact and date of the execution of any such instrument or writing, or the authority of the Person executing the same, may also be proved in any other reasonable manner which the Trustee deems sufficient.

(c) In determining whether the Certificateholders of the requisite Fractional Undivided Interests of Certificates of any series Outstanding have given any Direction under this Agreement, Certificates owned by the Company or any Affiliate thereof shall be disregarded and deemed not to be Outstanding for purposes of any such determination. In determining whether the Trustee shall be protected in relying upon any such Direction, only Certificates which the Trustee knows to be so owned shall be so disregarded. Notwithstanding the foregoing, (i) if any such Person (i.e., the Company or any Affiliate thereof) owns 100% of the Certificates of any series Outstanding, such Certificates shall not be so disregarded, and (ii) if any amount of Certificates of any series so owned by any such Person have been pledged in good faith, such Certificates shall not be disregarded if the pledgee establishes to the satisfaction of the Trustee the pledgee’s right so to act with respect to such Certificates and that the pledgee is not the Company or any Affiliate thereof.

(d) The Company may, at its option, by delivery of an Officer’s Certificate to the Trustee, set a record date to determine the Certificateholders in respect of the Certificates of any series, entitled to give any Direction. Notwithstanding Section 316(c) of the Trust Indenture Act, such record date shall be the record date specified in such Officer’s Certificate, which shall be a date not more than 30 days prior to the first solicitation of Certificateholders of the applicable series in connection therewith. If such a record date is fixed, such Direction may be given before or after such record date, but only the Certificateholders of record of the applicable series at the close of business on such record date shall be deemed to be Certificateholders for the purposes of determining whether Certificateholders of the requisite proportion of Outstanding Certificates of such series have authorized or agreed or consented to such Direction, and for that purpose the Outstanding Certificates shall be computed as of such record date; provided, however, that no such Direction by the Certificateholders on such record date shall be deemed effective unless it shall become effective pursuant to the provisions of this Agreement not later than one year after such record date.

(e) Any Direction by the Holder of any Certificate shall bind the Holder of every Certificate issued upon the transfer thereof or in exchange therefor or in lieu thereof, whether or not notation of such Direction is made upon such Certificate.

(f) Except as otherwise provided in Section 1.04(c), Certificates of any series owned by or pledged to any Person shall have an equal and proportionate benefit under the provisions of this Agreement, without preference, priority or distinction as among all of the Certificates of such series.

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ARTICLE II

ORIGINAL ISSUANCE OF CERTIFICATES:

ACQUISITION OF TRUST PROPERTY

Section 2.01. Amount Unlimited; Issuable in Series. (a) The aggregate principal amount of Certificates which may be authenticated and delivered under this Basic Agreement is unlimited. The Certificates may be issued from time to time in one or more series and shall be designated generally as the “Pass Through Certificates”, with such further designations added or incorporated in such title for the Certificates of each series as specified in the related Trust Supplement. Each Certificate shall bear upon its face the designation so selected for the series to which it belongs. All Certificates of the same series shall be substantially identical except that the Certificates of a series may differ as to denomination and as may otherwise be provided in the Trust Supplement establishing the Certificates of such series. Each series of Certificates issued pursuant to this Agreement will evidence fractional undivided interests in the related Trust and, except as may be contained in any Intercreditor Agreement, will have no rights, benefits or interests in respect of any other Trust or the Trust Property held therein. All Certificates of the same series shall be in all respects equally and ratably entitled to the benefits of this Agreement without preference, priority or distinction on account of the actual time or times of authentication and delivery, all in accordance with the terms and provisions of this Agreement.

(b) The following matters shall be established with respect to the Certificates of each series issued hereunder by a Trust Supplement executed and delivered by and among the Company and the Trustee:

(1) the formation of the Trust as to which the Certificates of such series represent fractional undivided interests and its designation (which designation shall distinguish such Trust from each other Trust created under this Basic Agreement and a Trust Supplement);

(2) the specific title of the Certificates of such series (which title shall distinguish the Certificates of such series from each other series of Certificates created under this Basic Agreement and a Trust Supplement);

(3) any limit upon the aggregate principal amount of the Certificates of such series which may be authenticated and delivered (which limit shall not pertain to Certificates authenticated and delivered upon registration of transfer of, or in exchange for, or in lieu of, other Certificates of the series pursuant to Sections 3.03, 3.04 and 3.06);

(4) the Cut-off Date with respect to the Certificates of such series;

(5) the Regular Distribution Dates applicable to the Certificates of such series;

(6) the Special Distribution Dates applicable to the Certificates of such series;

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(7) if other than as provided in Section 7.12(b), the Registrar or the Paying Agent for the Certificates of such series, including any Co-Registrar or additional Paying Agent;

(8) if other than as provided in Section 3.02, the denominations in which the Certificates of such series shall be issuable;

(9) if other than United States dollars, the currency or currencies (including currency units) in which the Certificates of such series shall be denominated;

(10) the specific form of the Certificates of such series (including the interest rate applicable thereto) and whether or not Certificates of such series are to be issued as Book-Entry Certificates and, if such Certificates are to be Book-Entry Certificates, the form of Letter of Representations, if any (or, in the case of any Certificates denominated in a currency other than United States dollars and if other than as provided in Section 3.05, whether and the circumstances under which beneficial owners of interests in such Certificates in permanent global form may exchange such interests for Certificates of such series and of like tenor of any authorized form and denomination);

(11) a description of the Equipment Notes to be acquired and held in the related Trust and of the related Aircraft and Note Documents;

(12) provisions with respect to the terms for which the definitions set forth in Article I hereof or the terms of Section 11.01 hereof require further specification in the related Trust Supplement;

(13) any restrictions (including legends) in respect of ERISA;

(14) whether such series will be subject to an Intercreditor Agreement and, if so, the specific designation of such Intercreditor Agreement;

(15) whether such series will have the benefit of a Liquidity Facility and, if so, the specific designation of such Liquidity Facility; and

(16) any other terms of the Certificates of such series (which terms shall not be inconsistent with the provisions of the Trust Indenture Act), including any terms of the Certificates of such series which may be required or advisable under United States laws or regulations or advisable in connection with the marketing of Certificates of the series.

(c) At any time and from time to time after the execution and delivery of this Basic Agreement and a Trust Supplement forming a Trust and establishing the terms of Certificates of a series, Certificates of such series shall be executed, authenticated and delivered by the Trustee to the Person or Persons specified by the Company upon request of the Company and upon satisfaction or waiver of any conditions precedent set forth in such Trust Supplement.

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Section 2.02. Acquisition of Equipment Notes. Unless otherwise specified in the related Trust Supplement, on or prior to the Issuance Date of the Certificates of a series, the Trustee shall execute and deliver the related Note Purchase Agreements in the form delivered to the Trustee by the Company and shall, subject to the respective terms thereof, perform its obligations under such Note Purchase Agreements. The Trustee shall issue and sell such Certificates, in authorized denominations and in such Fractional Undivided Interests, so as to result in the receipt of consideration in an amount equal to the aggregate purchase price of the Equipment Notes contemplated to be purchased by the Trustee under the related Note Purchase Agreements and, concurrently therewith, the Trustee shall purchase, pursuant to the terms and conditions of the Note Purchase Agreements, such Equipment Notes at a purchase price equal to the amount of such consideration so received. Except as provided in Sections 3.03, 3.04 and 3.06 hereof, the Trustee shall not execute, authenticate or deliver Certificates of such series in excess of the aggregate amount specified in this paragraph.

Section 2.03. Acceptance by Trustee. The Trustee, upon the execution and delivery of a Trust Supplement creating a Trust and establishing a series of Certificates, shall acknowledge its acceptance of all right, title and interest in and to the Trust Property to be acquired pursuant to Section 2.02 hereof and the related Note Purchase Agreements and shall declare that the Trustee holds and will hold such right, title and interest for the benefit of all then present and future Certificateholders of such series, upon the trusts herein and in such Trust Supplement set forth. By the acceptance of each Certificate of such series issued to it under this Agreement, each initial Holder of such series as grantor of such Trust shall thereby join in the creation and declaration of such Trust.

Section 2.04. Limitation of Powers. Each Trust shall be constituted solely for the purpose of making the investment in the Equipment Notes provided for in the related Trust Supplement, and, except as set forth herein, the Trustee shall not be authorized or empowered to acquire any other investments or engage in any other activities and, in particular, the Trustee shall not be authorized or empowered to do anything that would cause such Trust to fail to qualify as a “grantor trust” for federal income tax purposes.

ARTICLE III

THE CERTIFICATES

Section 3.01. Form, Denomination and Execution of Certificates. The Certificates of each series shall be issued in fully registered form without coupons and shall be substantially in the form attached to the related Trust Supplement, with such omissions, variations and insertions as are permitted by this Agreement, and may have such letters, numbers or other marks of identification and such legends or endorsements placed thereon as may be required to comply with the rules of any securities exchange on which such Certificates may be listed or to conform to any usage in respect thereof, or as may, consistently herewith, be determined by the Trustee or the officers executing such Certificates, as evidenced by the Trustee’s or respective officers’ execution of the Certificates.

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Except as provided in Section 3.05, the definitive Certificates of such series shall be typed, printed, lithographed or engraved or produced by any combination of these methods or may be produced in any other manner permitted by the rules of any securities exchange on which the Certificates may be listed, all as determined by the officers executing such Certificates, as evidenced by their execution of such Certificates.

Except as otherwise provided in the related Trust Supplement, the Certificates of each series shall be issued in minimum denominations of $1,000 or integral multiples thereof except that one Certificate of such series may be issued in a different denomination.

The Certificates of such series shall be executed on behalf of the Trustee by manual or facsimile signature of a Responsible Officer of the Trustee. Certificates of any series bearing the manual or facsimile signature of an individual who was, at the time when such signature was affixed, authorized to sign on behalf of the Trustee shall be valid and binding obligations of the Trustee, notwithstanding that such individual has ceased to be so authorized prior to the authentication and delivery of such Certificates or did not hold such office at the date of such Certificates.

Section 3.02. Authentication of Certificates. (a) On the Issuance Date, the Trustee shall duly execute, authenticate and deliver Certificates of each series in authorized denominations equaling in the aggregate the aggregate principal amount of the Equipment Notes that may be purchased by the Trustee pursuant to the related Note Purchase Agreements, and evidencing the entire ownership of the related Trust. Thereafter, the Trustee shall duly execute, authenticate and deliver the Certificates of such series as herein provided.

(b) No Certificate of any series shall be entitled to any benefit under this Agreement, or be valid for any purpose, unless there appears on such Certificate a certificate of authentication substantially in the form attached to the Trust Supplement establishing such series of Certificates executed by the Trustee by manual signature, and such certificate of authentication upon any Certificate shall be conclusive evidence, and the only evidence, that such Certificate has been duly authenticated and delivered hereunder. All Certificates of any series shall be dated the date of their authentication.

Section 3.03. Temporary Certificates. Until definitive Certificates are ready for delivery, the Trustee shall execute, authenticate and deliver temporary Certificates of each series. Temporary Certificates of each series shall be substantially in the form of definitive Certificates of such series but may have insertions, substitutions, omissions and other variations determined to be appropriate by the officers executing the temporary Certificates of such series, as evidenced by their execution of such temporary Certificates. If temporary Certificates of any series are issued, the Trustee will cause definitive Certificates of such series to be prepared without unreasonable delay. After the preparation of definitive Certificates of such series, the temporary Certificates shall be exchangeable for definitive Certificates upon surrender of such temporary Certificates at the office or agency of the Trustee designated for such purpose pursuant to Section 7.12, without charge to the Certificateholder. Upon surrender for cancellation of any one or more temporary Certificates, the Trustee shall execute, authenticate and deliver in exchange

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therefor a like face amount of definitive Certificates of like series, in authorized denominations and of a like Fractional Undivided Interest. Until so exchanged, such temporary Certificates shall be entitled to the same benefits under this Agreement as definitive Certificates.

Section 3.04. Transfer and Exchange. The Trustee shall cause to be kept at the office or agency to be maintained by it in accordance with the provisions of Section 7.12 a register (the “Register”) for each series of Certificates in which, subject to such reasonable regulations as it may prescribe, the Trustee shall provide for the registration of Certificates of such series and of transfers and exchanges of such Certificates as herein provided. The Trustee shall initially be the registrar (the “Registrar”) for the purpose of registering such Certificates of each series and transfers and exchanges of such Certificates as herein provided.

All Certificates issued upon any registration of transfer or exchange of Certificates of any series shall be valid obligations of the applicable Trust, evidencing the same interest therein, and entitled to the same benefits under this Agreement, as the Certificates of such series surrendered upon such registration of transfer or exchange.

Upon surrender for registration of transfer of any Certificate at the Corporate Trust Office or such other office or agency, the Trustee shall execute, authenticate and deliver, in the name of the designated transferee or transferees, one or more new Certificates of like series, in authorized denominations of a like aggregate Fractional Undivided Interest.

At the option of a Certificateholder, Certificates may be exchanged for other Certificates of like series, in authorized denominations and of a like aggregate Fractional Undivided Interest, upon surrender of the Certificates to be exchanged at any such office or agency. Whenever any Certificates are so surrendered for exchange, the Trustee shall execute, authenticate and deliver the Certificates that the Certificateholder making the exchange is entitled to receive. Every Certificate presented or surrendered for registration of transfer or exchange shall be duly endorsed or accompanied by a written instrument of transfer in form satisfactory to the Trustee and the Registrar duly executed by the Certificateholder thereof or its attorney duly authorized in writing.

No service charge shall be made to a Certificateholder for any registration of transfer or exchange of Certificates, but the Trustee shall require payment of a sum sufficient to cover any tax or governmental charge that may be imposed in connection with any transfer or exchange of Certificates. All Certificates surrendered for registration of transfer or exchange shall be cancelled and subsequently destroyed by the Trustee.

Section 3.05. Book-Entry and Definitive Certificates. (a) The Certificates of any series may be issued in the form of one or more typewritten Certificates representing the Book-Entry Certificates of such series, to be delivered to The Depository Trust Company, the initial Clearing Agency, by, or on behalf of, the Company. In such case, the Certificates of such series delivered to The Depository Trust Company shall initially be registered on the Register in the name of CEDE & Co., the nominee of the initial Clearing Agency, and no Certificate Owner will receive a definitive certificate representing such Certificate Owner’s interest in the Certificates of

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such series, except as provided above and in Subsection (d) below. As to the Certificates of any series, unless and until definitive, fully registered Certificates (the “Definitive Certificates”) have been issued pursuant to Subsection (d) below:

(i) the provisions of this Section 3.05 shall be in full force and effect;

(ii) the Company, the Paying Agent, the Registrar and the Trustee may deal with the Clearing Agency Participants for all purposes (including the making of distributions on the Certificates) as the authorized representatives of the Certificate Owners;

(iii) to the extent that the provisions of this Section 3.05 conflict with any other provisions of this Agreement (other than the provisions of any Trust Supplement expressly amending this Section 3.05 as permitted by this Basic Agreement), the provisions of this Section 3.05 shall control;

(iv) the rights of Certificate Owners shall be exercised only through the Clearing Agency and shall be limited to those established by law and agreements between such Certificate Owners and the Clearing Agency Participants; and until Definitive Certificates are issued pursuant to Subsection (d) below, the Clearing Agency will make book-entry transfers among the Clearing Agency Participants and receive and transmit distributions of principal, interest and premium, if any, on the Certificates to such Clearing Agency Participants; and

(v) whenever this Agreement requires or permits actions to be taken based upon instructions or directions of Certificateholders of such series holding Certificates of such series evidencing a specified percentage of the Fractional Undivided Interests in the related Trust, the Clearing Agency shall be deemed to represent such percentage only to the extent that it has received instructions to such effect from Clearing Agency Participants owning or representing, respectively, such required percentage of the beneficial interest in Certificates of such series and has delivered such instructions to the Trustee. The Trustee shall have no obligation to determine whether the Clearing Agency has in fact received any such instructions.

(b) Whenever notice or other communication to the Certificateholders of such series is required under this Agreement, unless and until Definitive Certificates shall have been issued pursuant to Subsection (d) below, the Trustee shall give all such notices and communications specified herein to be given to Certificateholders of such series to the Clearing Agency.

(c) Unless and until Definitive Certificates of a series are issued pursuant to Subsection (d) below, on the Record Date prior to each applicable Regular Distribution Date and Special Distribution Date, the Trustee will request from the Clearing Agency a securities position listing setting forth the names of all Clearing Agency Participants reflected on the Clearing Agency’s books as holding interests in the Certificates on such Record Date.

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(d) If with respect to the Certificates of any series (i) the Company advises the Trustee in writing that the Clearing Agency is no longer willing or able to discharge properly its responsibilities and the Trustee or the Company is unable to locate a qualified successor, (ii) the Company, at its option, advises the Trustee in writing that it elects to terminate the book-entry system through the Clearing Agency or (iii) after the occurrence of an Event of Default, Certificate Owners of Book-Entry Certificates of such series evidencing Fractional Undivided Interests aggregating not less than a majority in interest in the related Trust, by Act of such Certificate Owners delivered to the Company and the Trustee, advise the Company, the Trustee and the Clearing Agency through the Clearing Agency Participants in writing that the continuation of a book-entry system through the Clearing Agency Participants is no longer in the best interests of the Certificate Owners of such series, then the Trustee shall notify all Certificate Owners of such series, through the Clearing Agency, of the occurrence of any such event and of the availability of Definitive Certificates. Upon surrender to the Trustee of all the Certificates of such series held by the Clearing Agency, accompanied by registration instructions from the Clearing Agency Participants for registration of Definitive Certificates in the names of Certificate Owners of such series, the Trustee shall issue and deliver the Definitive Certificates of such series in accordance with the instructions of the Clearing Agency. Neither the Company, the Registrar, the Paying Agent nor the Trustee shall be liable for any delay in delivery of such instructions and may conclusively rely on, and shall be protected in relying on, such registration instructions. Upon the issuance of Definitive Certificates of such series, the Trustee shall recognize the Person in whose name the Definitive Certificates are registered in the Register as Certificateholders hereunder. Neither the Company nor the Trustee shall be liable if the Trustee or the Company is unable to locate a qualified successor Clearing Agency.

(e) Except as otherwise provided in the related Trust Supplement, the Trustee shall enter into the applicable Letter of Representations with respect to such series of Certificates and fulfill its responsibilities thereunder.

(f) The provisions of this Section 3.05 may be made inapplicable to any series or may be amended with respect to any series in the related Trust Supplement.

Section 3.06. Mutilated, Destroyed, Lost or Stolen Certificates. If (a) any mutilated Certificate is surrendered to the Registrar, or the Registrar receives evidence to its satisfaction of the destruction, loss or theft of any Certificate, and (b) there is delivered to the Registrar and the Trustee such security, indemnity or bond, as may be required by them to save each of them harmless, then, in the absence of notice to the Registrar or the Trustee that such destroyed, lost or stolen Certificate has been acquired by a bona fide purchaser, and provided, however, that the requirements of Section 8-405 of the Uniform Commercial Code in effect in any applicable jurisdiction are met, the Trustee shall execute, authenticate and deliver, in exchange for or in lieu of any such mutilated, destroyed, lost or stolen Certificate, a new Certificate or Certificates of like series, in authorized denominations and of like Fractional Undivided Interest and bearing a number not contemporaneously outstanding.

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In connection with the issuance of any new Certificate under this Section 3.06, the Trustee shall require the payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in relation thereto and any other expenses (including the fees and expenses of the Trustee and the Registrar) connected therewith.

Any duplicate Certificate issued pursuant to this Section 3.06 shall constitute conclusive evidence of the appropriate Fractional Undivided Interest in the related Trust, as if originally issued, whether or not the lost, stolen or destroyed Certificate shall be found at any time.

The provisions of this Section 3.06 are exclusive and shall preclude (to the extent lawful) all other rights and remedies with respect to the replacement or payment of mutilated, destroyed, lost or stolen Certificates.

Section 3.07. Persons Deemed Owners. Prior to due presentment of a Certificate for registration of transfer, the Trustee, the Registrar and any Paying Agent may treat the Person in whose name any Certificate is registered (as of the day of determination) as the owner of such Certificate for the purpose of receiving distributions pursuant to Article IV and for all other purposes whatsoever, and none of the Trustee, the Registrar or any Paying Agent shall be affected by any notice to the contrary.

Section 3.08. Cancellation. All Certificates surrendered for payment or transfer or exchange shall, if surrendered to the Trustee or any agent of the Trustee other than the Registrar, be delivered to the Registrar for cancellation and shall promptly be cancelled by it. No Certificates shall be authenticated in lieu of or in exchange for any Certificates cancelled as provided in this Section 3.08, except as expressly permitted by this Agreement. All cancelled Certificates held by the Registrar shall be destroyed and a certification of their destruction delivered to the Trustee.

Section 3.09. Limitation of Liability for Payments. All payments and distributions made to Certificateholders of any series in respect of the Certificates of such series shall be made only from the Trust Property of the related Trust and only to the extent that the Trustee shall have sufficient income or proceeds from such Trust Property to make such payments in accordance with the terms of Article IV of this Agreement. Each Certificateholder, by its acceptance of a Certificate, agrees that it will look solely to the income and proceeds from the Trust Property of the related Trust for any payment or distribution due to such Certificateholder pursuant to the terms of this Agreement and that it will not have any recourse to the Company, the Trustee, any Liquidity Provider or the Loan Trustees, except as otherwise expressly provided herein or in the related Intercreditor Agreement.

The Company is a party to this Agreement solely for purposes of meeting the requirements of the Trust Indenture Act, and therefore shall not have any right, obligation or liability hereunder (except as otherwise expressly provided herein).

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ARTICLE IV

DISTRIBUTIONS; STATEMENTS TO

CERTIFICATEHOLDERS

Section 4.01. Certificate Account and Special Payments Account. (a) The Trustee shall establish and maintain on behalf of the Certificateholders of each series a Certificate Account as one or more non-interest-bearing accounts. The Trustee shall hold such Certificate Account in trust for the benefit of the Certificateholders of such series, and shall make or permit withdrawals therefrom only as provided in this Agreement. On each day when a Scheduled Payment is made to the Trustee (under an Intercreditor Agreement, if applicable) with respect to the Certificates of such series, the Trustee, upon receipt thereof, shall immediately deposit the aggregate amount of such Scheduled Payment in such Certificate Account.

(b) The Trustee shall establish and maintain on behalf of the Certificateholders of each series a Special Payments Account as one or more accounts, which shall be non-interest bearing except as provided in Section 4.04. The Trustee shall hold the Special Payments Account in trust for the benefit of the Certificateholders of such series and shall make or permit withdrawals therefrom only as provided in this Agreement. On each day when one or more Special Payments are made to the Trustee (under an Intercreditor Agreement, if applicable) with respect to the Certificates of such series, the Trustee, upon receipt thereof, shall immediately deposit the aggregate amount of such Special Payments in such Special Payments Account.

(c) The Trustee shall present (or, if applicable, cause the Subordination Agent to present) to the related Loan Trustee of each Equipment Note such Equipment Note on the date of its stated final maturity or, in the case of any Equipment Note which is to be redeemed in whole pursuant to the related Indenture, on the applicable redemption date under such Indenture.

Section 4.02. Distributions from Certificate Account and Special Payments Account. (a) On each Regular Distribution Date with respect to a series of Certificates or as soon thereafter as the Trustee has confirmed receipt of the payment of all or any part of the Scheduled Payments due on the Equipment Notes held (subject to the Intercreditor Agreement) in the related Trust on such date, the Trustee shall distribute out of the applicable Certificate Account the entire amount deposited therein pursuant to Section 4.01(a). There shall be so distributed to each Certificateholder of record of such series on the Record Date with respect to such Regular Distribution Date (other than as provided in Section 11.01 concerning the final distribution) by check mailed to such Certificateholder, at the address appearing in the Register, such Certificateholder’s pro rata share (based on the Fractional Undivided Interest in the Trust held by such Certificateholder) of the total amount in the applicable Certificate Account, except that, with respect to Certificates registered on the Record Date in the name of a Clearing Agency (or its nominee), such distribution shall be made by wire transfer in immediately available funds to the account designated by such Clearing Agency (or such nominee).

(b) On each Special Distribution Date with respect to any Special Payment with respect to a series of Certificates or as soon thereafter as the Trustee has confirmed receipt of any Special Payments due on the Equipment Notes held (subject to the Intercreditor

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Agreement) in the related Trust or realized upon the sale of such Equipment Notes, the Trustee shall distribute out of the applicable Special Payments Account the entire amount of such applicable Special Payment deposited therein pursuant to Section 4.01(b). There shall be so distributed to each Certificateholder of record of such series on the Record Date with respect to such Special Distribution Date (other than as provided in Section 11.01 concerning the final distribution) by check mailed to such Certificateholder, at the address appearing in the Register, such Certificateholder’s pro rata share (based on the Fractional Undivided Interest in the related Trust held by such Certificateholder) of the total amount in the applicable Special Payments Account on account of such Special Payment, except that, with respect to Certificates registered on the Record Date in the name of a Clearing Agency (or its nominee), such distribution shall be made by wire transfer in immediately available funds to the account designated by such Clearing Agency (or such nominee).

(c) The Trustee shall, at the expense of the Company, cause notice of each Special Payment with respect to a series of Certificates to be mailed to each Certificateholder of such series at his address as it appears in the Register. In the event of redemption or purchase of Equipment Notes held in the related Trust, such notice shall be mailed not less than 15 days prior to the Special Distribution Date for the Special Payment resulting from such redemption or purchase, which Special Distribution Date shall be the date of such redemption or purchase. In the case of any other Special Payments, such notice shall be mailed as soon as practicable after the Trustee has confirmed that it has received funds for such Special Payment, stating the Special Distribution Date for such Special Payment which shall occur not less than 15 days after the date of such notice and as soon as practicable thereafter. Notices mailed by the Trustee shall set forth:

(i) the Special Distribution Date and the Record Date therefor (except as otherwise provided in Section 11.01),

(ii) the amount of the Special Payment for each $1,000 face amount Certificate and the amount thereof constituting principal, Break Amount, premium, if any, and interest,

(iii) the reason for the Special Payment, and

(iv) if the Special Distribution Date is the same date as a Regular Distribution Date for the Certificates of such series, the total amount to be received on such date for each $1,000 face amount Certificate.

If the amount of premium, if any, payable upon the redemption or purchase of an Equipment Note has not been calculated at the time that the Trustee mails notice of a Special Payment, it shall be sufficient if the notice sets forth the other amounts to be distributed and states that any premium received will also be distributed.

If any redemption of the Equipment Notes held in any Trust is canceled, the Trustee, as soon as possible after learning thereof, shall cause notice thereof to be mailed to each Certificateholder of the related series at its address as it appears on the Register.

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Section 4.03. Statements to Certificateholders. (a) On each Distribution Date, the Trustee will include with each distribution to Certificateholders of a related series of a Scheduled Payment or Special Payment, as the case may be, a statement setting forth the information provided below. Such statement shall set forth (per $1,000 face amount of Certificate as to (ii) and (iii) below) the following information:

(i) the aggregate amount of funds distributed on such Distribution Date under the Agreement, indicating the amount allocable to each source, including any portion thereof paid by the Liquidity Providers;

(ii) the amount of such distribution hereunder allocable to principal and the amount allocable to Break Amount and to premium, if any;

(iii) the amount of such distribution hereunder allocable to interest;

(iv) the Pool Balance and the Pool Factor of the related Trust; and

(v) Six-Month LIBOR (as defined in the Indentures) for the current and immediately preceding interest periods.

With respect to the Certificates registered in the name of a Clearing Agency or its nominee, on the Record Date prior to each Distribution Date, the Trustee will request that such Clearing Agency post on its Internet bulletin board a securities position listing setting forth the names of all Clearing Agency Participants reflected on such Clearing Agency’s books as holding interests in the Certificates on such Record Date. On each Distribution Date, the applicable Trustee will mail to each such Clearing Agency Participant the statement described above and will make available additional copies as requested by such Clearing Agency Participant for forwarding to holders of interests in the Certificates.

(b) Within a reasonable period of time after the end of each calendar year but not later than the latest date permitted by law, the Trustee shall furnish to each Person who at any time during such calendar year was a Certificateholder of record a statement containing the sum of the amounts determined pursuant to clauses (a)(i), (a)(ii) and (a)(iii) above with respect to the related Trust for such calendar year or, in the event such Person was a Certificateholder of record during a portion of such calendar year, for such portion of such year, and such other items as are readily available to the Trustee and which a Certificateholder shall reasonably request as necessary for the purpose of such Certificateholder’s preparation of its U.S. federal income tax returns. With respect to Certificates registered in the name of a Clearing Agency or its nominee, such statement and such other items shall be prepared on the basis of information supplied to the Trustee by the Clearing Agency Participants and shall be delivered by the Trustee to such Clearing Agency Participants to be available for forwarding by such Clearing Agency Participants to the holders of interests in the Certificates in the manner described in Section 4.03(a).

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(c) The Trustee shall provide promptly to the Certificateholders of each series all material non-confidential information received by the Trustee from the Company.

Section 4.04. Investment of Special Payment Moneys. Any money received by the Trustee pursuant to Section 4.01(b) representing a Special Payment which is not distributed on the date received shall, to the extent practicable, be invested in Permitted Investments by the Trustee pending distribution of such Special Payment pursuant to Section 4.02. Any investment made pursuant to this Section 4.04 shall be in such Permitted Investments having maturities not later than the date that such moneys are required to be used to make the payment required under Section 4.02 on the applicable Special Distribution Date and the Trustee shall hold any such Permitted Investments until maturity. The Trustee shall have no liability with respect to any investment made pursuant to this Section 4.04, other than by reason of the willful misconduct or negligence of the Trustee. All income and earnings from such investments shall be distributed on such Special Distribution Date as part of such Special Payment.

ARTICLE V

THE COMPANY

Section 5.01. Maintenance of Corporate Existence. The Company, at its own cost and expense, will do or cause to be done all things necessary to preserve and keep in full force and effect its corporate existence, rights and franchises, except as otherwise specifically permitted in Section 5.02; provided, however, that the Company shall not be required to preserve any right or franchise if the Company shall determine that the preservation thereof is no longer desirable in the conduct of the business of the Company.

Section 5.02. Consolidation, Merger, Etc. The Company shall not consolidate with or merge into any other person under circumstances in which the Company is not the surviving corporation or convey, transfer or lease substantially all of its assets as an entirety to any Person unless:

(a) the Person formed by such consolidation or into which the Company is merged or the Person that acquires by conveyance, transfer or lease substantially all of the assets of the Company as an entirety shall be (i) organized and validly existing under the laws of the United States of America or any state thereof or the District of Columbia, (ii) a “citizen of the United States” as defined in 49 U.S.C. § 40102(a)(15), as amended, and (iii) a United States certificated air carrier, if and so long as such status is a condition of entitlement to the benefits of Section 1110 of the Bankruptcy Reform Act of 1978, as amended (11 U.S.C. § 1110), with respect to the Aircraft owned by the Company;

(b) the Person formed by such consolidation or into which the Company is merged or the Person which acquires by conveyance, transfer or lease substantially all of the assets of the Company as an entirety shall execute and deliver to the Trustee applicable to the Certificates of each series a duly authorized, valid, binding and enforceable agreement in form and substance reasonably satisfactory to the Trustee containing an assumption by such successor

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corporation or Person of the due and punctual performance and observance of each covenant and condition of the Note Documents and of this Agreement applicable to the Certificates of each series to be performed or observed by the Company; and

(c) the Company shall have delivered to the Trustee applicable to the Certificates of each series, an Officer’s Certificate, and an Opinion of Counsel, each stating that such consolidation, merger, conveyance, transfer or lease comply with this Section 5.02 and that all conditions precedent herein provided relating to such transaction have been complied with (except that such opinion may rely, as to factual matters, on a certificate of an officer of the Company).

Upon any consolidation or merger, or any conveyance, transfer or lease of substantially all of the assets of the Company as an entirety in accordance with this Section 5.02, the successor corporation or Person formed by such consolidation or into which the Company is merged or to which such conveyance, transfer or lease is made shall succeed to, and be substituted for, and may exercise every right and power of, the Company under this Agreement applicable to the Certificates of each series with the same effect as if such successor corporation or Person had been named as the Company herein. No such conveyance, transfer or lease of substantially all of the assets of the Company as an entirety shall have the effect of releasing any successor corporation or Person which shall have become such in the manner prescribed in this Section 5.02 from its liability in respect of this Agreement and any Note Document applicable to the Certificates of such series to which it is a party.

ARTICLE VI

DEFAULT

Section 6.01. Events of Default. (a) Exercise of Remedies. Upon the occurrence and during the continuation of any Indenture Event of Default under any Indenture, the Trustee may (i) to the extent it is the Controlling Party at such time (as determined pursuant to the related Intercreditor Agreement), direct the exercise of remedies as provided in such related Intercreditor Agreement and (ii) if there is no related Intercreditor Agreement, direct the exercise of remedies or take other action as provided in the relevant Indenture to the extent that it may do so as the holder of the Equipment Notes issued under such Indenture and held in the related Trust.

(b) Purchase Rights of Certificateholders. At any time after the occurrence and during the continuation of a Triggering Event, each Certificateholder of Certificates of certain series (each, a “Potential Purchaser” and, collectively, the “Potential Purchasers”) will have certain rights to purchase the Certificates of one or more other series, all as set forth in the Trust Supplement applicable to the Certificates held by such Potential Purchaser. The purchase price with respect to the Certificates of any series shall be equal to the Pool Balance of the Certificates of such series, together with accrued and unpaid interest thereon to the date of such purchase, without premium, but including any other amounts then due and payable to the Certificateholders of such series under this Agreement, any related Intercreditor Agreement or any other Note Document or on or in respect of the Certificates of such series; provided,

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however, that if such purchase occurs after a Record Date, such purchase price shall be reduced by the amount to be distributed hereunder on the related Distribution Date (which deducted amounts shall remain distributable to, and may be retained by, the Certificateholder as of such Record Date); provided, further, that no such purchase of Certificates of such series shall be effective unless the purchasing Certificateholder (each, a “Purchasing Certificateholder” and, collectively, the “Purchasing Certificateholders”) shall certify to the Trustee that contemporaneously with such purchase, one or more Purchasing Certificateholders are purchasing, pursuant to the terms of this Agreement and the other Agreements, if any, relating to the Certificates of a series that are subject to the same Intercreditor Agreement (such other Agreements, the “Other Agreements”), the Certificates of each such series that the Trust Supplement applicable to the Certificates held by the Purchasing Certificateholder specifies may be purchased by such Purchasing Certificateholder. Each payment of the purchase price of the Certificates of any series shall be made to an account or accounts designated by the Trustee and each such purchase shall be subject to the terms of this Section 6.01. By acceptance of its Certificate, each Certificateholder (each, a “Selling Certificateholder” and, collectively, the “Selling Certificateholders”) of a series that is subject to purchase by Potential Purchasers, all as set forth in the Trust Supplement applicable to the Certificates held by the Selling Certificateholders, agrees that, at any time after the occurrence and during the continuance of a Triggering Event, it will, upon payment of the purchase price specified herein by one or more Purchasing Certificateholders, forthwith sell, assign, transfer and convey to such Purchasing Certificateholder (without recourse, representation or warranty of any kind except for its own acts), all of the right, title, interest and obligation of such Selling Certificateholder in this Agreement, any related Intercreditor Agreement, the related Liquidity Facility, the related Note Documents and all Certificates of such series held by such Selling Certificateholder (excluding all right, title and interest under any of the foregoing to the extent such right, title or interest is with respect to an obligation not then due and payable as respects any action or inaction or state of affairs occurring prior to such sale) and the Purchasing Certificateholder shall assume all of such Selling Certificateholder’s obligations under this Agreement, any related Intercreditor Agreement, the related Liquidity Facility and the related Note Documents. The Certificates of such series will be deemed to be purchased on the date payment of the purchase price is made notwithstanding the failure of any Selling Certificateholder to deliver any Certificates of such series and, upon such a purchase, (i) the only rights of the Selling Certificateholders will be to deliver the Certificates to the Purchasing Certificateholder and receive the purchase price for such Certificates of such series and (ii) if the Purchasing Certificateholder shall so request, such Selling Certificateholder will comply with all of the provisions of Section 3.04 hereof to enable new Certificates of such series to be issued to the Purchasing Certificateholder in such denominations as it shall request. All charges and expenses in connection with the issuance of any such new Certificates shall be borne by the Purchasing Certificateholder.

Section 6.02. Incidents of Sale of Equipment Notes. Upon any sale of all or any part of the Equipment Notes held in the Trust made either under the power of sale given under this Agreement or otherwise for the enforcement of this Agreement, the following shall be applicable:

(1) Certificateholders and Trustee May Purchase Equipment Notes. Any Certificateholder, the Trustee in its individual or any other capacity or any other Person may bid for and purchase any of the Equipment Notes held in the Trust, and upon compliance with the terms of sale, may hold, retain, possess and dispose of such Equipment Notes in their own absolute right without further accountability.

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(2) Receipt of Trustee Shall Discharge Purchaser. The receipt of the Trustee making such sale shall be a sufficient discharge to any purchaser for his purchase money, and, after paying such purchase money and receiving such receipt, such purchaser or its personal representative or assigns shall not be obliged to see to the application of such purchase money, or be in any way answerable for any loss, misapplication or non-application thereof.

(3) Application of Moneys Received upon Sale. Any moneys collected by the Trustee upon any sale made either under the power of sale given by this Agreement or otherwise for the enforcement of this Agreement shall be applied as provided in Section 4.02.

Section 6.03. Judicial Proceedings Instituted by Trustee; Trustee May Bring Suit. If there shall be a failure to make payment of the principal of, premium, if any, or interest on any Equipment Note held in the related Trust when due and payable, then the Trustee, in its own name and as trustee of an express trust, as holder of such Equipment Notes, to the extent permitted by and in accordance with the terms of any related Intercreditor Agreement and any related Note Documents, shall be entitled and empowered to institute any suits, actions or proceedings at law, in equity or otherwise, for the collection of the sums so due and unpaid on such Equipment Notes and may prosecute any such claim or proceeding to judgment or final decree with respect to the whole amount of any such sums so due and unpaid.

Section 6.04. Control by Certificateholders. Subject to Section 6.03 and any related Intercreditor Agreement, the Certificateholders holding Certificates of a series evidencing Fractional Undivided Interests aggregating not less than a majority in interest in the related Trust shall have the right to direct the time, method and place of conducting any proceeding for any remedy available to the Trustee with respect to such Trust or pursuant to the terms of such Intercreditor Agreement, or exercising any trust or power conferred on the Trustee under this Agreement or such Intercreditor Agreement, including any right of the Trustee as Controlling Party under such Intercreditor Agreement or as holder of the Equipment Notes held in the related Trust; provided, however, that

(1) such Direction shall not in the opinion of the Trustee be in conflict with any rule of law or with this Agreement and would not involve the Trustee in personal liability or expense,

(2) the Trustee shall not determine that the action so directed would be unjustly prejudicial to the Certificateholders of such series not taking part in such Direction, and

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(3) the Trustee may take any other action deemed proper by the Trustee which is not inconsistent with such Direction.

Section 6.05. Waiver of Past Defaults. Subject to any related Intercreditor Agreement, the Certificateholders holding Certificates of a series evidencing Fractional Undivided Interests aggregating not less than a majority in interest in the Trust (i) may on behalf of all of the Certificateholders waive any past Event of Default hereunder and its consequences or (ii) if the Trustee is the Controlling Party, may direct the Trustee to instruct the applicable Loan Trustee to waive any past Indenture Event of Default under any related Indenture and its consequences, and thereby annul any Direction given by such Certificateholder or the Trustee to such Loan Trustee with respect thereto, except a default:

(1) in the deposit of any Scheduled Payment or Special Payment under Section 4.01 or in the distribution of any payment under Section 4.02 on the Certificates of a series, or

(2) in the payment of the principal of (Break Amount, if any, or premium, if any) or interest on the Equipment Notes held in the related Trust, or

(3) in respect of a covenant or provision hereof which under Article IX hereof cannot be modified or amended without the consent of each Certificateholder holding an Outstanding Certificate of a series affected thereby.

Upon any such waiver, such default shall cease to exist with respect to the Certificates of such series and any Event of Default arising therefrom shall be deemed to have been cured for every purpose and any direction given by the Trustee on behalf of the Certificateholders of such series to the relevant Loan Trustee shall be annulled with respect thereto; but no such waiver shall extend to any subsequent or other default or Event of Default or impair any right consequent thereon. Upon any such waiver, the Trustee shall vote the Equipment Notes issued under the relevant Indenture to waive the corresponding Indenture Event of Default.

Section 6.06. Right of Certificateholders to Receive Payments Not to Be Impaired. Anything in this Agreement to the contrary notwithstanding, including, without limitation, Section 6.07 hereof, but subject to any related Intercreditor Agreement, the right of any Certificateholder to receive distributions of payments required pursuant to Section 4.02 hereof on the applicable Certificates when due, or to institute suit for the enforcement of any such payment on or after the applicable Regular Distribution Date or Special Distribution Date, shall not be impaired or affected without the consent of such Certificateholder.

Section 6.07. Certificateholders May Not Bring Suit Except Under Certain Conditions. A Certificateholder of any series shall not have the right to institute any suit, action or proceeding at law or in equity or otherwise with respect to this Agreement, for the appointment of a receiver or for the enforcement of any other remedy under this Agreement, unless:

(1) such Certificateholder previously shall have given written notice to the Trustee of a continuing Event of Default;

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(2) Certificateholders holding Certificates of such series evidencing Fractional Undivided Interests aggregating not less than 25% of the related Trust shall have requested the Trustee in writing to institute such action, suit or proceeding and shall have offered to the Trustee indemnity as provided in Section 7.03(e);

(3) the Trustee shall have refused or neglected to institute any such action, suit or proceeding for 60 days after receipt of such notice, request and offer of indemnity; and

(4) no direction inconsistent with such written request shall have been given to the Trustee during such 60-day period by Certificateholders holding Certificates of such series evidencing Fractional Undivided Interests aggregating not less than a majority in interest in the related Trust.

It is understood and intended that no one or more of the Certificateholders of any series shall have any right in any manner whatsoever hereunder or under the related Trust Supplement or under the Certificates of such series to (i) surrender, impair, waive, affect, disturb or prejudice any property in the Trust Property of the related Trust, or the lien of any related Indenture on any property subject thereto, or the rights of the Certificateholders of such series or the holders of the related Equipment Notes, (ii) obtain or seek to obtain priority over or preference with respect to any other such Certificateholder of such series or (iii) enforce any right under this Agreement, except in the manner herein provided and for the equal, ratable and common benefit of all the Certificateholders of such series subject to the provisions of this Agreement.

Section 6.08. Remedies Cumulative. Every remedy given hereunder to the Trustee or to any of the Certificateholders of any series shall not be exclusive of any other remedy or remedies, and every such remedy shall be cumulative and in addition to every other remedy given hereunder or now or hereafter given by statute, law, equity or otherwise.

Section 6.09. Undertaking for Costs. In any suit for the enforcement of any right or remedy under this Agreement, or in any suit against the Trustee for any action taken, suffered or omitted by it as Trustee, a court may require any party litigant in such suit to file an undertaking to pay the costs of such suit, and may assess costs against any such party litigant, in the manner and to the extent provided in the Trust Indenture Act; provided, however, that neither this Section 6.09 nor the Trust Indenture Act shall be deemed to authorize any court to require such an undertaking or to make such an assessment in any suit instituted by the Company.

ARTICLE VII

THE TRUSTEE

Section 7.01. Certain Duties and Responsibilities. (a) Except during the continuance of an Event of Default in respect of a Trust, the Trustee undertakes to perform such duties in respect of such Trust as are specifically set forth in this Agreement, and no implied covenants or obligations shall be read into this Agreement against the Trustee.

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(b) In case an Event of Default in respect of a Trust has occurred and is continuing, the Trustee shall exercise such of the rights and powers vested in it by this Agreement in respect of such Trust, and use the same degree of care and skill in their exercise, as a prudent man would exercise or use under the circumstances in the conduct of his own affairs.

(c) No provision of this Agreement shall be construed to relieve the Trustee from liability for its own negligent action, its own negligent failure to act, or its own willful misconduct, except that

(1) this Subsection shall not be construed to limit the effect of Subsection (a) of this Section 7.01; and

(2) the Trustee shall not be liable for any error of judgment made in good faith by a Responsible Officer of the Trustee, unless it shall be proved that the Trustee was negligent in ascertaining the pertinent facts.

(d) Whether or not herein expressly so provided, every provision of this Agreement relating to the conduct or affecting the liability of or affording protection to the Trustee shall be subject to the provisions of this Section 7.01.

Section 7.02. Notice of Defaults. As promptly as practicable after, and in any event within 90 days after, the occurrence of any default (as such term is defined below) hereunder known to the Trustee, the Trustee shall transmit by mail to the Company, the related Loan Trustees and the Certificateholders holding Certificates of the related series in accordance with Section 313(c) of the Trust Indenture Act, notice of such default hereunder known to the Trustee, unless such default shall have been cured or waived; provided, however, that, except in the case of a default in the payment of the principal, premium, if any, Break Amount, if any, or interest on any Equipment Note, the Trustee shall be protected in withholding such notice if and so long as the board of directors, the executive committee or a trust committee of directors and/or Responsible Officers of the Trustee in good faith shall determine that the withholding of such notice is in the best interests of the Certificateholders of the related series. For the purpose of this Section 7.02 in respect of any Trust, the term “default” means any event that is, or after notice or lapse of time or both would become, an Event of Default in respect of that Trust.

Section 7.03. Certain Rights of Trustee. Subject to the provisions of Section 315 of the Trust Indenture Act:

(a) the Trustee may rely and shall be protected in acting or refraining from acting in reliance upon any resolution, certificate, statement, instrument, opinion, report, notice, request, direction, consent, order, bond, debenture or other paper or document believed by it to be genuine and to have been signed or presented by the proper party or parties;

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(b) any request or direction of the Company mentioned herein shall be sufficiently evidenced by a Request;

(c) whenever in the administration of this Agreement or any Intercreditor Agreement, the Trustee shall deem it desirable that a matter be proved or established prior to taking, suffering or omitting any action hereunder, the Trustee (unless other evidence be herein specifically prescribed) may, in the absence of bad faith on its part, rely upon an Officer’s Certificate of the Company or any related Loan Trustee;

(d) the Trustee may consult with counsel and the advice of such counsel or any Opinion of Counsel shall be full and complete authorization and protection in respect of any action taken, suffered or omitted by it hereunder in good faith and in reliance thereon;

(e) the Trustee shall be under no obligation to exercise any of the rights or powers vested in it by this Agreement or any Intercreditor Agreement at the Direction of any of the Certificateholders pursuant to this Agreement or any Intercreditor Agreement, unless such Certificateholders shall have offered to the Trustee reasonable security or indemnity against the cost, expenses and liabilities which might be incurred by it in compliance with such Direction;

(f) the Trustee shall not be bound to make any investigation into the facts or matters stated in any resolution, certificate, statement, instrument, opinion, report, notice, request, direction, consent, order, bond, debenture or other paper or document;

(g) the Trustee may execute any of the trusts or powers under this Agreement or any Intercreditor Agreement or perform any duties under this Agreement or any Intercreditor Agreement either directly or by or through agents or attorneys, and the Trustee shall not be responsible for any misconduct or negligence on the part of any agent or attorney appointed with due care by it under this Agreement or any Intercreditor Agreement;

(h) the Trustee shall not be liable with respect to any action taken or omitted to be taken by it in good faith in accordance with the Direction of the Certificateholders holding Certificates of any series evidencing Fractional Undivided Interests aggregating not less than a majority in interest in the related Trust relating to the time, method and place of conducting any proceeding for any remedy available to the Trustee, or exercising any trust or power conferred upon the Trustee, under this Agreement or any Intercreditor Agreement; and

(i) the Trustee shall not be required to expend or risk its own funds in the performance of any of its duties under this Agreement, or in the exercise of any of its rights or powers, if it shall have reasonable grounds for believing that repayment of such funds or adequate indemnity against such risk is not reasonably assured to it.

Section 7.04. Not Responsible for Recitals or Issuance of Certificates. The recitals contained herein and in the Certificates of each series, except the certificates of authentication, shall not be taken as the statements of the Trustee, and the Trustee assumes no responsibility for their correctness. Subject to Section 7.15, the Trustee makes no representations as to the validity or sufficiency of this Basic Agreement, any Equipment Notes, any Intercreditor Agreement, the

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Certificates of any series, any Trust Supplement or any Note Documents, except that the Trustee hereby represents and warrants that this Basic Agreement has been, and each Trust Supplement, each Certificate, each Note Purchase Agreement and each Intercreditor Agreement of, or relating to, each series will be executed and delivered by one of its officers who is duly authorized to execute and deliver such document on its behalf.

Section 7.05. May Hold Certificates. The Trustee, any Paying Agent, Registrar or any of their Affiliates or any other agent, in their respective individual or any other capacity, may become the owner or pledgee of Certificates and, subject to Sections 310(b) and 311 of the Trust Indenture Act, if applicable, may otherwise deal with the Company or the Loan Trustees with the same rights it would have if it were not Trustee, Paying Agent, Registrar or such other agent.

Section 7.06. Money Held in Trust. Money held by the Trustee or the Paying Agent in trust under this Agreement need not be segregated from other funds except to the extent required herein or by law and neither the Trustee nor the Paying Agent shall have any liability for interest upon any such moneys except as provided for herein.

Section 7.07. Compensation and Reimbursement. The Company agrees:

(1) to pay, or cause to be paid, to the Trustee from time to time reasonable compensation for all services rendered by it hereunder (which compensation shall not be limited by any provision of law in regard to the compensation of a trustee of an express trust); and

(2) except as otherwise expressly provided herein or in any Trust Supplement, to reimburse, or cause to be reimbursed, the Trustee upon its request for all reasonable out-of-pocket expenses, disbursements and advances incurred or made by the Trustee in accordance with any provision of this Basic Agreement, any Trust Supplement or any Intercreditor Agreement (including the reasonable compensation and the expenses and disbursements of its agents and counsel), except any such expense, disbursement or advance as may be attributable to its negligence, willful misconduct or bad faith or as may be incurred due to the Trustee’s breach of its representations and warranties set forth in Section 7.15; and

(3) to indemnify, or cause to be indemnified, the Trustee with respect to the Certificates of any series, pursuant to Section 7.1 of each Participation Agreement.

The Trustee shall be entitled to reimbursement from, and shall have a lien prior to the Certificates of each series upon, all property and funds held or collected by the Trustee in its capacity as Trustee with respect to such series or the related Trust for any tax incurred without negligence, bad faith or willful misconduct, on its part, arising out of or in connection with the acceptance or administration of such Trust (other than any tax attributable to the Trustee’s compensation for serving as such), including any costs and expenses incurred in contesting the imposition of any such tax. The Trustee shall notify the Company of any claim for any tax for which it may seek reimbursement. If the Trustee reimburses itself from the Trust Property of such Trust for any such tax, it will mail a brief report within 30 days setting forth the amount of such tax and the circumstances thereof to all Certificateholders of such series as their names and addresses appear in the Register.

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Section 7.08. Corporate Trustee Required; Eligibility. Each Trust shall at all times have a Trustee which shall be eligible to act as a trustee under Section 310(a) of the Trust Indenture Act and shall have a combined capital and surplus of at least $75,000,000 (or a combined capital and surplus in excess of $5,000,000 and the obligations of which, whether now in existence or hereafter incurred, are fully and unconditionally guaranteed by a corporation organized and doing business under the laws of the United States, any state or territory thereof or of the District of Columbia and having a combined capital and surplus of at least $75,000,000). If such corporation publishes reports of conditions at least annually, pursuant to law or to the requirements of federal, state, territorial or District of Columbia supervising or examining authority, then for the purposes of this Section 7.08 the combined capital and surplus of such corporation shall be deemed to be its combined capital and surplus as set forth in its most recent report of conditions so published.

In case at any time the Trustee shall cease to be eligible in accordance with the provisions of this Section 7.08 to act as Trustee of any Trust, the Trustee shall resign immediately as Trustee of such Trust in the manner and with the effect specified in Section 7.09.

Section 7.09. Resignation and Removal; Appointment of Successor. (a) No resignation or removal of the Trustee and no appointment of a successor Trustee of any Trust pursuant to this Article shall become effective until the acceptance of appointment by the successor Trustee under Section 7.10.

(b) The Trustee may resign at any time as Trustee of any or all Trusts by giving prior written notice thereof to the Company, the Authorized Agents and the related Loan Trustees. If an instrument of acceptance by a successor Trustee shall not have been delivered to the Company and the Trustee within 30 days after the giving of such notice of resignation, the resigning Trustee may petition any court of competent jurisdiction for the appointment of a successor Trustee.

(c) The Trustee may be removed at any time by Direction of the Certificateholders of the related series holding Certificates evidencing Fractional Undivided Interests aggregating not less than a majority in interest in such Trust delivered to the Trustee and to the Company and the related Loan Trustees.

(d) If at any time in respect of any Trust:

(1) the Trustee shall fail to comply with Section 310 of the Trust Indenture Act, if applicable, after written request therefor by the Company or by any Certificateholder who has been a bona fide Certificateholder for at least six months; or

(2) the Trustee shall cease to be eligible under Section 7.08 and shall fail to resign after written request therefor by the Company or by any such Certificateholder; or

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(3) the Trustee shall become incapable of acting or shall be adjudged a bankrupt or insolvent, or a receiver of the Trustee or of its property shall be appointed or any public officer shall take charge or control of the Trustee or of its property or affairs for the purpose of rehabilitation, conservation or liquidation;

then, in any case, (i) the Company may remove the Trustee or (ii) any Certificateholder of the related series who has been a bona fide Certificateholder for at least six months may, on behalf of itself and all others similarly situated, petition any court of competent jurisdiction for the removal of the Trustee and the appointment of a successor Trustee of such Trust.

(e) If a Responsible Officer of the Trustee shall obtain actual knowledge of an Avoidable Tax in respect of any Trust which has been or is likely to be asserted, the Trustee shall promptly notify the Company and shall, within 30 days of such notification, resign as Trustee of such Trust hereunder unless within such 30-day period the Trustee shall have received notice that the Company has agreed to pay such tax. The Company shall promptly appoint a successor Trustee of such Trust in a jurisdiction where there are no Avoidable Taxes.

(f) If the Trustee shall resign, be removed or become incapable of acting as Trustee of any Trust or if a vacancy shall occur in the office of the Trustee of any Trust for any cause, the Company shall promptly appoint a successor Trustee of such Trust. If, within one year after such resignation, removal or incapability, or other occurrence of such vacancy, a successor Trustee of such Trust shall be appointed by Direction of the Certificateholders of the related series holding Certificates of such series evidencing Fractional Undivided Interests aggregating not less than a majority in interest in such Trust delivered to the Company, the related Loan Trustee and the retiring Trustee, then the successor Trustee of such Trust so appointed shall, with the approval of the Company of such appointment, which approval shall not be unreasonably withheld, forthwith upon its acceptance of such appointment, become the successor Trustee of such Trust and supersede the successor Trustee of such Trust appointed as provided above. If no successor Trustee shall have been so appointed as provided above and accepted appointment in the manner hereinafter provided, the resigning Trustee or any Certificateholder who has been a bona fide Certificateholder of the related series for at least six months may, on behalf of himself and all others similarly situated, petition any court of competent jurisdiction for the appointment of a successor Trustee of such Trust.

(g) The successor Trustee of a Trust shall give notice of the resignation and removal of the Trustee and appointment of the successor Trustee by mailing written notice of such event by first-class mail, postage prepaid, to the Certificateholders of the related series as their names and addresses appear in the Register. Each notice shall include the name of such successor Trustee and the address of its Corporate Trust Office.

Section 7.10. Acceptance of Appointment by Successor. Every successor Trustee appointed hereunder shall execute and deliver to the Company and to the retiring Trustee with respect to any or all Trusts an instrument accepting such appointment, and thereupon the resignation or removal of the retiring Trustee with respect to such Trusts shall become effective and such successor Trustee, without any further act, deed or conveyance, shall become vested

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with all the rights, powers, trusts and duties of the retiring Trustee; but, on request of the Company or the successor Trustee, such retiring Trustee shall execute and deliver an instrument transferring to such successor Trustee all such rights, powers and trusts of the retiring Trustee and shall duly assign, transfer and deliver to such successor Trustee all Trust Property held by such retiring Trustee in respect of such Trusts hereunder, subject nevertheless to its lien, if any, provided for in Section 7.07. Upon request of any such successor Trustee, the Company, the retiring Trustee and such successor Trustee shall execute and deliver any and all instruments containing such provisions as shall be necessary or desirable to transfer and confirm to, and for more fully and certainly vesting in, such successor Trustee all such rights, powers and trusts.

If a successor Trustee is appointed with respect to one or more (but not all) Trusts, the Company, the predecessor Trustee and each successor Trustee with respect to any Trust shall execute and deliver a supplemental agreement hereto which shall contain such provisions as shall be deemed necessary or desirable to confirm that all the rights, powers, trusts and duties of the predecessor Trustee with respect to the Trusts as to which the predecessor Trustee is not retiring shall continue to be vested in the predecessor Trustee, and shall add to or change any of the provisions of this Basic Agreement and the applicable Trust Supplements as shall be necessary to provide for or facilitate the administration of the Trusts hereunder by more than one Trustee, it being understood that nothing herein or in such supplemental agreement shall constitute such Trustees as co-Trustees of the same Trust and that each such Trustee shall be Trustee of separate Trusts.

No institution shall accept its appointment as a Trustee hereunder unless at the time of such acceptance such institution shall be qualified and eligible under this Article VII.

Section 7.11. Merger, Conversion, Consolidation or Succession to Business. Any corporation into which the Trustee may be merged or converted or with which it may be consolidated, or any corporation resulting from any merger, conversion or consolidation to which the Trustee shall be a party, or any corporation succeeding to all or substantially all of the corporate trust business of the Trustee, shall be the successor of the Trustee hereunder; provided, however, that such corporation shall be otherwise qualified and eligible under this Article VII, without the execution or filing of any paper or any further act on the part of any of the parties hereto. In case any Certificates shall have been executed or authenticated, but not delivered, by the Trustee then in office, any successor by merger, conversion or consolidation to such authenticating Trustee may adopt such execution or authentication and deliver the Certificates so executed or authenticated with the same effect as if such successor Trustee had itself executed or authenticated such Certificates.

Section 7.12. Maintenance of Agencies. (a) With respect to each series of Certificates, there shall at all times be maintained an office or agency in the location set forth in Section 12.04 where Certificates of such series may be presented or surrendered for registration of transfer or for exchange, and for payment thereof, and where notices and demands, to or upon the Trustee in respect of such Certificates or this Agreement may be served; provided, however, that, if it shall be necessary that the Trustee maintain an office or agency in another location with respect to the Certificates of any series (e.g., the Certificates of such series shall be represented by Definitive

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Certificates and shall be listed on a national securities exchange), the Trustee will make all reasonable efforts to establish such an office or agency. Written notice of the location of each such other office or agency and of any change of location thereof shall be given by the Trustee to the Company, the Loan Trustees (in the case of any Loan Trustee, at its address specified in the Note Documents or such other address as may be notified to the Trustee) and the Certificateholders of such series. In the event that no such office or agency shall be maintained or no such notice of location or of change of location shall be given, presentations and demands may be made and notices may be served at the Corporate Trust Office of the Trustee.

(b) There shall at all times be a Registrar and a Paying Agent hereunder with respect to the Certificates of each series. Each such Authorized Agent shall be a bank or trust company, shall be a corporation organized and doing business under the laws of the United States or any state, with a combined capital and surplus of at least $75,000,000, or a corporation having a combined capital and surplus in excess of $5,000,000, the obligations of which are guaranteed by a corporation organized and doing business under the laws of the United States or any state, with a combined capital and surplus of at least $75,000,000, and shall be authorized under such laws to exercise corporate trust powers, subject to supervision by federal or state authorities. The Trustee shall initially be the Paying Agent and, as provided in Section 3.04, Registrar hereunder with respect to the Certificates of each series. Each Registrar shall furnish to the Trustee, at stated intervals of not more than six months, and at such other times as the Trustee may request in writing, a copy of the Register maintained by such Registrar.

(c) Any corporation into which any Authorized Agent may be merged or converted or with which it may be consolidated, or any corporation resulting from any merger, consolidation or conversion to which any Authorized Agent shall be a party, or any corporation succeeding to the corporate trust business of any Authorized Agent, shall be the successor of such Authorized Agent, if such successor corporation is otherwise eligible under this Section 7.12, without the execution or filing of any paper or any further act on the part of the parties hereto or such Authorized Agent or such successor corporation.

(d) Any Authorized Agent may at any time resign by giving written notice of resignation to the Trustee, the Company and the related Loan Trustees. The Company may, and at the request of the Trustee shall, at any time terminate the agency of any Authorized Agent by giving written notice of termination to such Authorized Agent and to the Trustee. Upon the resignation or termination of an Authorized Agent or in case at any time any such Authorized Agent shall cease to be eligible under this Section 7.12 (when, in either case, no other Authorized Agent performing the functions of such Authorized Agent shall have been appointed), the Company shall promptly appoint one or more qualified successor Authorized Agents, reasonably satisfactory to the Trustee, to perform the functions of the Authorized Agent which has resigned or whose agency has been terminated or who shall have ceased to be eligible under this Section 7.12. The Company shall give written notice of any such appointment made by it to the Trustee and the related Loan Trustees; and in each case the Trustee shall mail notice of such appointment to all Certificateholders of the related series as their names and addresses appear on the Register for such series.

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(e) The Company agrees to pay, or cause to be paid, from time to time to each Authorized Agent reasonable compensation for its services and to reimburse it for its reasonable expenses.

Section 7.13. Money for Certificate Payments to be Held in Trust. All moneys deposited with any Paying Agent for the purpose of any payment on Certificates shall be deposited and held in trust for the benefit of the Certificateholders entitled to such payment, subject to the provisions of this Section 7.13. Moneys so deposited and held in trust shall constitute a separate trust fund for the benefit of the Certificateholders with respect to which such money was deposited.

The Trustee may at any time, for the purpose of obtaining the satisfaction and discharge of this Agreement or for any other purpose, direct any Paying Agent to pay to the Trustee all sums held in trust by such Paying Agent, such sums to be held by the Trustee upon the same trusts as those upon which such sums were held by such Paying Agent; and, upon such payment by any Paying Agent to the Trustee, such Paying Agent shall be released from all further liability with respect to such money.

Section 7.14. Registration of Equipment Notes in Trustee’s Name. Subject to Section 12.03 hereof, the Trustee agrees that all Equipment Notes to be purchased by any Trust and Permitted Investments, if any, shall be issued in the name of the Trustee as trustee for the applicable Trust or its nominee and held by the Trustee in trust for the benefit of the Certificateholders of such series, or, if not so held, the Trustee or its nominee shall be reflected as the owner of such Equipment Notes or Permitted Investments, as the case may be, in the register of the issuer of such Equipment Notes or Permitted Investments, as the case may be.

Section 7.15. Representations and Warranties of Trustee. The Trustee hereby represents and warrants that:

(a) the Trustee is a Delaware banking corporation organized and validly existing in good standing under the laws of the State of Delaware;

(b) the Trustee has full power, authority and legal right to execute, deliver and perform this Agreement, any Intercreditor Agreement and the Note Purchase Agreements and has taken all necessary action to authorize the execution, delivery and performance by it of this Agreement, any Intercreditor Agreement and the Note Purchase Agreements;

(c) the execution, delivery and performance by the Trustee of this Agreement, any Intercreditor Agreement and the Note Purchase Agreements (i) will not violate any provision of any United States federal law or the law of the state of the United States where it is located governing the banking and trust powers of the Trustee or any order, writ, judgment, or decree of any court, arbitrator or governmental authority applicable to the Trustee or any of its assets, (ii) will not violate any provision of the articles of association or by-laws of the Trustee, and (iii) will not violate any provision of, or constitute, with or without notice or lapse of time, a default under, or result in the creation or imposition of any lien on any properties included in the Trust Property pursuant to the provisions of any mortgage, indenture, contract, agreement or

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other undertaking to which it is a party, which violation, default or lien could reasonably be expected to have an adverse effect on the Trustee’s performance or ability to perform its duties hereunder or thereunder or on the transactions contemplated herein or therein;

(d) the execution, delivery and performance by the Trustee of this Agreement, any Intercreditor Agreement and the Note Purchase Agreements will not require the authorization, consent, or approval of, the giving of notice to, the filing or registration with, or the taking of any other action in respect of, any governmental authority or agency of the United States or the state of the United States where it is located regulating the banking and corporate trust activities of the Trustee;

(e) this Agreement, any Intercreditor Agreement and the Note Purchase Agreements have been duly executed and delivered by the Trustee and constitute the legal, valid and binding agreements of the Trustee, enforceable against it in accordance with their respective terms; provided, however, that enforceability may be limited by (i) applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the rights of creditors generally and (ii) general principles of equity; and

(f) the statements made by it in a Statement of Eligibility on Form T-1 supplied or to be supplied to the Company in connection with the registration of any Certificates are and will be true and accurate subject to the qualifications set forth therein; and that such statement complies and will comply in all material respects with the requirements of the Trust Indenture Act and the Securities Act.

Section 7.16. Withholding Taxes; Information Reporting. As to the Certificates of any series, the Trustee, as trustee of the related grantor trust created by this Agreement, shall exclude and withhold from each distribution of principal, premium, if any, and interest and other amounts due under this Agreement or under the Certificates of such series any and all withholding taxes applicable thereto as required by law. The Trustee agrees to act as such withholding agent and, in connection therewith, whenever any present or future taxes or similar charges are required to be withheld with respect to any amounts payable in respect of the Certificates of such series, to withhold such amounts and timely pay the same to the appropriate authority in the name of and on behalf of the Certificateholders of such series, that it will file any necessary withholding tax returns or statements when due, and that, as promptly as possible after the payment thereof, it will deliver to each such Certificateholder of such series appropriate documentation showing the payment thereof, together with such additional documentary evidence as such Certificateholders may reasonably request from time to time. The Trustee agrees to file any other information reports as it may be required to file under United States law.

Section 7.17. Trustee’s Liens. The Trustee in its individual capacity agrees that it will, in respect of each Trust created by this Agreement, at its own cost and expense promptly take any action as may be necessary to duly discharge and satisfy in full any mortgage, pledge, lien, charge, encumbrance, security interest or claim (“Trustee’s Liens”) on or with respect to the Trust Property of such Trust which is attributable to the Trustee either (i) in its individual capacity and which is unrelated to the transactions contemplated by this Agreement or the related Note Documents or (ii) as Trustee hereunder or in its individual capacity and which arises out of acts or omissions which are not contemplated by this Agreement.

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Section 7.18. Preferential Collection of Claims. The Trustee shall comply with Section 311(a) of the Trust Indenture Act, excluding any creditor relationship listed in Section 311(b) of the Trust Indenture Act. If the Trustee shall resign or be removed as Trustee, it shall be subject to Section 311(a) of the Trust Indenture Act to the extent provided therein.

ARTICLE VIII

CERTIFICATEHOLDERS’ LISTS AND REPORTS BY TRUSTEE

Section 8.01. The Company to Furnish Trustee with Names and Addresses of Certificateholders. The Company will furnish to the Trustee within 15 days after each Record Date with respect to a Scheduled Payment, and at such other times as the Trustee may request in writing within 30 days after receipt by the Company of any such request, a list, in such form as the Trustee may reasonably require, of all information in the possession or control of the Company as to the names and addresses of the Certificateholders of each series, in each case as of a date not more than 15 days prior to the time such list is furnished; provided, however, that so long as the Trustee is the sole Registrar for such series, no such list need be furnished; and provided further, however, that no such list need be furnished for so long as a copy of the Register is being furnished to the Trustee pursuant to Section 7.12.

Section 8.02. Preservation of Information; Communications to Certificateholders. The Trustee shall preserve, in as current a form as is reasonably practicable, the names and addresses of Certificateholders of each series contained in the most recent list furnished to the Trustee as provided in Section 7.12 or Section 8.01, as the case may be, and the names and addresses of Certificateholders of each series received by the Trustee in its capacity as Registrar, if so acting. The Trustee may destroy any list furnished to it as provided in Section 7.12 or Section 8.01, as the case may be, upon receipt of a new list so furnished.

Section 8.03. Reports by Trustee. Within 60 days after May 15 of each year commencing with the first full year following the issuance of any series of Certificates, the Trustee shall transmit to the Certificateholders of such series, as provided in Section 313(c) of the Trust Indenture Act, a brief report dated as of such May 15, if required by Section 313(a) of the Trust Indenture Act.

Section 8.04. Reports by the Company. The Company shall:

(a) file with the Trustee, within 30 days after the Company is required to file the same with the SEC, copies of the annual reports and of the information, documents and other reports (or copies of such portions of any of the foregoing as the SEC may from time to time by rules and regulations prescribe) which the Company is required to file with the SEC pursuant to section 13 or section 15(d) of the Securities Exchange Act of 1934, as amended; or, if the Company is not required to file information, documents or reports pursuant to either of such sections, then to file with the Trustee and the SEC, in accordance with rules and regulations

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prescribed by the SEC, such of the supplementary and periodic information, documents and reports which may be required pursuant to section 13 of the Securities Exchange Act of 1934, as amended, in respect of a security listed and registered on a national securities exchange as may be prescribed in such rules and regulations;

(b) file with the Trustee and the SEC, in accordance with the rules and regulations prescribed by the SEC, such additional information, documents and reports with respect to compliance by the Company with the conditions and covenants of the Company provided for in this Agreement, as may be required by such rules and regulations, including, in the case of annual reports, if required by such rules and regulations, certificates or opinions of independent public accountants, conforming to the requirements of Section 1.02;

(c) transmit to all Certificateholders, in the manner and to the extent provided in Section 313(c) of the Trust Indenture Act such summaries of any information, documents and reports required to be filed by the Company pursuant to subsections (a) and (b) of this Section 8.04 as may be required by rules and regulations prescribed by the SEC; and

(d) furnish to the Trustee, not less often than annually, a brief certificate from the principal executive officer, principal financial officer or principal accounting officer as to his knowledge of the Company’s compliance with all conditions and covenants under this Agreement (it being understood that for purposes of this paragraph (d), such compliance shall be determined without regard to any period of grace or requirement of notice provided under this Agreement).

ARTICLE IX

SUPPLEMENTAL AGREEMENTS

Section 9.01. Supplemental Agreements Without Consent of Certificateholders. Without the consent of the Certificateholders, the Company may (but will not be required to), and the Trustee (subject to Section 9.03) shall, at the Company’s request, at any time and from time to time, enter into one or more agreements supplemental hereto or, if applicable, to an Intercreditor Agreement, a Note Purchase Agreement or a Liquidity Facility, in form satisfactory to the Trustee, for any of the following purposes:

(1) to provide for the formation of a Trust, the issuance of a series of Certificates and other matters contemplated by Section 2.01(b); or

(2) to evidence the succession of another corporation to the Company and the assumption by any such successor of the covenants of the Company herein contained or of the Company’s obligations under any Intercreditor Agreement, any Note Purchase Agreement or any Liquidity Facility; or

(3) to add to the covenants of the Company for the benefit of the Certificateholders of any series, or to surrender any right or power conferred upon the Company in this Agreement, any Note Purchase Agreement, any Intercreditor Agreement or any Liquidity Facility; or

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(4) to correct or supplement any provision in this Agreement, any Intercreditor Agreement, any Note Purchase Agreement or any Liquidity Facility which may be defective or inconsistent with any other provision herein or therein or to cure any ambiguity or to modify any other provision with respect to matters or questions arising under this Agreement, any Intercreditor Agreement, any Note Purchase Agreement or any Liquidity Facility, provided, however, that any such action shall not materially adversely affect the interests of the Certificateholders of any series; to correct any mistake in this Agreement, any Intercreditor Agreement, any Note Purchase Agreement or any Liquidity Facility; or, as provided in any Intercreditor Agreement, to give effect to or provide for a Replacement Liquidity Facility (as defined in such Intercreditor Agreement); or

(5) to comply with any requirement of the SEC, any applicable law, rules or regulations of any exchange or quotation system on which the Certificates of any series are listed or of any regulatory body; or

(6) to modify, eliminate or add to the provisions of this Agreement, any Intercreditor Agreement, any Note Purchase Agreement or any Liquidity Facility to such extent as shall be necessary to continue the qualification of this Agreement, any Intercreditor Agreement or any Liquidity Facility (including any supplemental agreement) under the Trust Indenture Act or under any similar Federal statute hereafter enacted, and to add to this Agreement, any Intercreditor Agreement, any Note Purchase Agreement or any Liquidity Facility such other provisions as may be expressly permitted by the Trust Indenture Act, excluding, however, the provisions referred to in Section 316(a)(2) of the Trust Indenture Act as in effect at the date as of which this Basic Agreement was executed or any corresponding provision in any similar Federal statute hereafter enacted; or

(7) to evidence and provide for the acceptance of appointment under this Agreement, any Intercreditor Agreement, any Note Purchase Agreement or any Liquidity Facility by a successor Trustee with respect to one or more Trusts and to add to or change any of the provisions of this Agreement, any Intercreditor Agreement, any Note Purchase Agreement or any Liquidity Facility as shall be necessary to provide for or facilitate the administration of the Trust, pursuant to the requirements of Section 7.10; or

(8) to provide the information required under Section 7.12 and Section 12.04 as to the Trustee; or

(9) to make any other amendments or modifications hereto, provided, however, that such amendments or modifications shall apply to Certificates of any series to be thereafter issued;

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provided, however, that no such supplemental agreement shall adversely affect the status of any Trust as a grantor trust under Subpart E, Part I of Subchapter J of Chapter 1 of Subtitle A of the Internal Revenue Code of 1986, as amended, for U.S. federal income tax purposes.

Section 9.02. Supplemental Agreements with Consent of Certificateholders. With respect to each separate Trust and the series of Certificates relating thereto, with the consent of the Certificateholders holding Certificates of such series (including consents obtained in connection with a tender offer or exchange offer for the Certificates) evidencing Fractional Undivided Interests aggregating not less than a majority in interest in such Trust, by Direction of said Certificateholders delivered to the Company and the Trustee, the Company may, but shall not be obligated to, and the Trustee (subject to Section 9.03) shall, enter into an agreement or agreements supplemental hereto for the purpose of adding any provisions to or changing in any manner or eliminating any of the provisions of this Agreement, any Intercreditor Agreement, any Note Purchase Agreement or any Liquidity Facility to the extent applicable to such Certificateholders or of modifying in any manner the rights and obligations of such Certificateholders under this Agreement, any Intercreditor Agreement, any Note Purchase Agreement or any Liquidity Facility; provided, however, that no such agreement shall, without the consent of the Certificateholder of each Outstanding Certificate affected thereby:

(1) reduce in any manner the amount of, or delay the timing of, any receipt by the Trustee of payments on the Equipment Notes held in such Trust or distributions that are required to be made herein on any Certificate of such series, or change any date of payment on any Certificate of such series, or change the place of payment where, or the coin or currency in which, any Certificate of such series is payable, or impair the right to institute suit for the enforcement of any such payment or distribution on or after the Regular Distribution Date or Special Distribution Date applicable thereto; or

(2) permit the disposition of any Equipment Note included in the Trust Property of such Trust except as permitted by this Agreement, any Trust Supplement or the Intercreditor Agreement, or otherwise deprive such Certificateholder of the benefit of the ownership of the Equipment Notes in such Trust; or

(3) alter the priority of distributions specified in the Intercreditor Agreement in a manner materially adverse to the interests of the Certificateholders of such series; or

(4) reduce the specified percentage of the aggregate Fractional Undivided Interests of such Trust that is required for any such supplemental agreement, or reduce such specified percentage required for any waiver (of compliance with certain provisions of this Agreement or certain defaults hereunder and their consequences) provided for in this Agreement; or

(5) modify any of the provisions of this Section 9.02 or Section 6.05, except to increase any such percentage or to provide that certain other provisions of this Agreement cannot be modified or waived without the consent of the Certificateholder of each Certificate of such series affected thereby; or

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(6) adversely affect the status of any Trust as a grantor trust under Subpart E, Part I of Subchapter J of Chapter 1 of Subtitle A of the Internal Revenue Code of 1986, as amended, for U.S. federal income tax purposes; or

(7) If a Parent Guarantee is issued by the Parent Guarantor guaranteeing the Equipment Notes held in such Trust, modify such Parent Guarantee in a manner materially adverse to the interests of the Certificateholders of such series.

It shall not be necessary for any Direction of such Certificateholders under this Section 9.02 to approve the particular form of any proposed supplemental agreement, but it shall be sufficient if such Direction shall approve the substance thereof.

Section 9.03. Documents Affecting Immunity or Indemnity. If in the opinion of the Trustee any document required to be executed by it pursuant to the terms of Section 9.01 or 9.02 affects any interest, right, duty, immunity or indemnity in favor of the Trustee under this Basic Agreement or any Trust Supplement, the Trustee may in its discretion decline to execute such document.

Section 9.04. Execution of Supplemental Agreements. In executing, or accepting the additional trusts created by, any supplemental agreement permitted by this Article or the modifications thereby of the trusts created by this Agreement, the Trustee shall be entitled to receive, and shall be fully protected in relying upon, an Opinion of Counsel stating that the execution of such supplemental agreement is authorized or permitted by this Agreement.

Section 9.05. Effect of Supplemental Agreements. Upon the execution of any agreement supplemental to this Agreement under this Article, this Basic Agreement shall be modified in accordance therewith, and such supplemental agreement shall form a part of this Basic Agreement for all purposes; and every Certificateholder of each series theretofore or thereafter authenticated and delivered hereunder shall be bound thereby to the extent applicable to such series.

Section 9.06. Conformity with Trust Indenture Act. Every supplemental agreement executed pursuant to this Article shall conform to the requirements of the Trust Indenture Act as then in effect.

Section 9.07. Reference in Certificates to Supplemental Agreements. Certificates of each series authenticated and delivered after the execution of any supplemental agreement applicable to such series pursuant to this Article may bear a notation in form approved by the Trustee as to any matter provided for in such supplemental agreement; and, in such case, suitable notation may be made upon Outstanding Certificates of such series after proper presentation and demand.

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ARTICLE X

AMENDMENTS TO INDENTURE AND NOTE DOCUMENTS

Section 10.01. Amendments and Supplements to Indenture and other Note Documents. In the event that the Trustee, as holder (or beneficial owner through the Subordination Agent) of any Equipment Notes in trust for the benefit of the Certificateholders of any series or as Controlling Party under an Intercreditor Agreement, receives (directly or indirectly through the Subordination Agent) a request for a consent to any amendment, modification, waiver or supplement under any Indenture, other Note Document or any other related document, the Trustee shall forthwith send a notice of such proposed amendment, modification, waiver or supplement to each Certificateholder of such series registered on the Register as of the date of such notice. The Trustee shall request from the Certificateholders of such series a Direction as to (a) whether or not to take or refrain from taking (or direct the Subordination Agent to take or refrain from taking) any action which a holder of such Equipment Note or a Controlling Party has the option to direct, (b) whether or not to give or execute (or direct the Subordination Agent to give or execute) any waivers, consents, amendments, modifications or supplements as a holder of such Equipment Note or as Controlling Party and (c) how to vote (or direct the Subordination Agent to vote) any Equipment Note if a vote has been called for with respect thereto. Provided such a request for Certificateholder Direction shall have been made and subject to the provisions of Section 1.04(c) hereof, in directing any action or casting any vote or giving any consent as the holder of any Equipment Note (or in directing the Subordination Agent in any of the foregoing), (i) other than as Controlling Party, the Trustee shall vote for or give consent to any such action with respect to such Equipment Note in the same proportion as that of (A) the aggregate face amounts of all Certificates actually voted in favor of or for giving consent to such action by such Direction of Certificateholders to (B) the aggregate face amount of all Outstanding Certificates and (ii) as Controlling Party, the Trustee shall vote as directed in such Certificateholder Direction by the Certificateholders of such series evidencing a Fractional Undivided Interest aggregating not less than a majority in interest in the Trust. For purposes of the immediately preceding sentence, a Certificate shall have been “actually voted” if the Holder of such Certificate has delivered to the Trustee an instrument evidencing such Holder’s consent to such Direction prior to one Business Day before the Trustee directs such action or casts such vote or gives such consent. Notwithstanding the foregoing, but subject to Section 6.04 and any Intercreditor Agreement, the Trustee may, with respect to the Certificates of any series, in its own discretion and at its own direction, consent and notify the relevant Loan Trustee of such consent (or direct the Subordination Agent to consent and notify the Loan Trustee of such consent) to any amendment, modification, waiver or supplement under any related Indenture or any other related Note Document if an Event of Default hereunder shall have occurred and be continuing or if such amendment, modification, waiver or supplement will not materially adversely affect the interests of the Certificateholders of such series.

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ARTICLE XI

TERMINATION OF TRUSTS

Section 11.01. Termination of the Trusts. In respect of each Trust created by the Basic Agreement as supplemented by a related Trust Supplement, the respective obligations and responsibilities of the Company and the Trustee with respect to such Trust shall terminate upon the distribution to all Holders of Certificates of the series of such Trust and the Trustee of all amounts required to be distributed to them pursuant to this Agreement and the disposition of all property held as part of the Trust Property of such Trust; provided, however, that in no event shall such Trust continue beyond one hundred ten (110) years following the date of the execution of the Trust Supplement with respect to such Trust (or such other final expiration date as may be specified in such Trust Supplement).

Notice of any termination of a Trust, specifying the applicable Regular Distribution Date (or applicable Special Distribution Date, as the case may be) upon which the Certificateholders of any series may surrender their Certificates to the Trustee for payment of the final distribution and cancellation, shall be mailed promptly by the Trustee to Certificateholders of such series not earlier than the minimum number of days and not later than the maximum number of days specified therefor in the related Trust Supplement preceding such final distribution specifying (A) the Regular Distribution Date (or Special Distribution Date, as the case may be) upon which the proposed final payment of the Certificates of such series will be made upon presentation and surrender of Certificates of such series at the office or agency of the Trustee therein specified, (B) the amount of any such proposed final payment, and (C) that the Record Date otherwise applicable to such Regular Distribution Date (or Special Distribution Date, as the case may be) is not applicable, payments being made only upon presentation and surrender of the Certificates of such series at the office or agency of the Trustee therein specified. The Trustee shall give such notice to the Registrar at the time such notice is given to Certificateholders of such series. Upon presentation and surrender of the Certificates of such series in accordance with such notice, the Trustee shall cause to be distributed to Certificateholders of such series amounts distributable on such Regular Distribution Date (or Special Distribution Date, as the case may be) pursuant to Section 4.02.

In the event that all of the Certificateholders of such series shall not surrender their Certificates for cancellation within six months after the date specified in the above-mentioned written notice, the Trustee shall give a second written notice to the remaining Certificateholders of such series to surrender their Certificates for cancellation and receive the final distribution with respect thereto. No additional interest shall accrue on the Certificates of such series after any Regular Distribution Date (or Special Distribution Date, as the case may be) of such series, as specified in the first written notice. In the event that any money held by the Trustee for the payment of distributions on the Certificates of such series shall remain unclaimed for two years (or such lesser time as the Trustee shall be satisfied, after 60 days’ notice from the Company, is one month prior to the escheat period provided under applicable law) after the final distribution date with respect thereto, the Trustee shall pay to each Loan Trustee the appropriate amount of money relating to such Loan Trustee and shall give written notice thereof to the Company.

[Pass Through Trust Agreement]

ARTICLE XII

MISCELLANEOUS PROVISIONS

Section 12.01. Limitation on Rights of Certificateholders. The death or incapacity of any Certificateholder of any series shall not operate to terminate this Agreement or the related Trust, nor entitle such Certificateholder’s legal representatives or heirs to claim an accounting or to take any action or commence any proceeding in any court for a partition or winding up of the Trust, nor otherwise affect the rights, obligations, and liabilities of the parties hereto or any of them.

Section 12.02. Liabilities of Certificateholders. Neither the existence of the Trust nor any provision in this Agreement is intended to or shall limit the liability the Certificateholders would otherwise incur if the Certificateholders owned Trust Property as co-owners, or incurred any obligations of the Trust, directly rather than through the Trust.

Section 12.03. Registration of Equipment Notes in Name of Subordination Agent. If a Trust is party to an Intercreditor Agreement, the Trustee agrees that all Equipment Notes to be purchased by such Trust shall be issued in the name of the Subordination Agent under such Intercreditor Agreement or its nominee and held by such Subordination Agent in trust for the benefit of the Certificateholders, or, if not so held, such Subordination Agent or its nominee shall be reflected as the owner of such Equipment Notes in the register of the issuer of such Equipment Notes.

Section 12.04. Notices. (a) Unless otherwise specifically provided herein or in the applicable Trust Supplement with respect to any Trust, all notices required under the terms and provisions of this Basic Agreement or such Trust Supplement with respect to such Trust shall be in English and in writing, and any such notice may be given by United States mail, courier service or telecopy, and any such notice shall be effective when delivered or received or, if mailed, three days after deposit in the United States mail with proper postage for ordinary mail prepaid,


if to the Company:

	United Air Lines, Inc.
	77 West Wacker Drive
	Chicago, IL 60601
	Attention:	Stephen R. Lieberman, Vice President & Treasurer
	Email:	stephen.lieberman@united.com,
	Telephone/Facsimile: 312-997-8000, and

	Attention:	Paul R. Lovejoy, Senior Vice President, General Counsel and Secretary
	Email:	paul.lovejoy@united.com
	Telephone/Facsimile: 312-997-8000

[Pass Through Trust Agreement]



with a copy to

	Vedder Price Kaufman & Kammholz, PC
	222 N. LaSalle Street, Suite 2400
	Chicago, IL 60601
	Attention:	Joshua D. Gentner, Shareholder
	Facsimile:	(312) 609-5005
	Telephone:	(312) 609-7887

if to the Trustee:

	Wilmington Trust Company
	Rodney Square North
	1100 North Market Street
	Wilmington, DE 19890-0001
	Attention:	Corporate Trust Department
	Facsimile:	(302) 651-8882
	Telephone:	(302) 651-8584

(b) The Company or the Trustee, by notice to the other, may designate additional or different addresses for subsequent notices or communications.

(c) Any notice or communication to Certificateholders of any series shall be mailed by first-class mail to the addresses for Certificateholders of such series shown on the Register kept by the Registrar and to addresses filed with the Trustee for Certificate Owners of such series. Failure so to mail a notice or communication or any defect in such notice or communication shall not affect its sufficiency with respect to other Certificateholders or Certificate Owners of such series.

(d) If a notice or communication is mailed in the manner provided above within the time prescribed, it is conclusively presumed to have been duly given, whether or not the addressee receives it.

(e) If the Company mails a notice or communication to the Certificateholders of such series, it shall mail a copy to the Trustee and to each Paying Agent for such series at the same time.

(f) Notwithstanding the foregoing, all communications or notices to the Trustee shall be deemed to be given only when received by a Responsible Officer of the Trustee.

(g) The Trustee shall promptly furnish the Company with a copy of any demand, notice or written communication received by the Trustee hereunder from any Certificateholder or Loan Trustee.

Section 12.05. Governing Law. THIS BASIC AGREEMENT HAS BEEN DELIVERED IN THE STATE OF NEW YORK AND, TOGETHER WITH ALL TRUST

[Pass Through Trust Agreement]

SUPPLEMENTS AND CERTIFICATES, SHALL BE CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.

Section 12.06. Severability of Provisions. If any one or more of the covenants, agreements, provisions or terms of this Agreement shall be for any reason whatsoever held invalid, then such covenants, agreements, provisions, or terms shall be deemed severable from the remaining covenants, agreements, provisions or terms of this Agreement and shall in no way affect the validity or enforceability of the other provisions of this Agreement or the related Trust, or of the Certificates of such series or the rights of the Certificateholders thereof.

Section 12.07. Trust Indenture Act Controls. This Agreement is subject to the provisions of the Trust Indenture Act and shall, to the extent applicable, be governed by such provisions. If any provision of this Agreement limits, qualifies or conflicts with another provision which is required to be included in this Agreement by the Trust Indenture Act, the required provision shall control.

Section 12.08. Effect of Headings and Table of Contents. The Article and Section headings herein and the Table of Contents are for convenience only and shall not affect the construction hereof.

Section 12.09. Successors and Assigns. All covenants, agreements, representations and warranties in this Agreement by the Trustee and the Company shall bind and, to the extent permitted hereby, shall inure to the benefit of and be enforceable by their respective successors and assigns, whether so expressed or not.

Section 12.10. Benefits of Agreement. Nothing in this Agreement or in the Certificates of any series, express or implied, shall give to any Person, other than the parties hereto and their successors hereunder, and the Certificateholders of each series, any benefit or any legal or equitable right, remedy or claim under this Agreement.

Section 12.11. Legal Holidays. In any case where any Regular Distribution Date or Special Distribution Date relating to any Certificate of any series shall not be a Business Day with respect to such series, then (notwithstanding any other provision of this Agreement) payment need not be made on such date, but may be made on the next succeeding Business Day with the same force and effect as if made on such Regular Distribution Date or Special Distribution Date, and no interest shall accrue during the intervening period.

Section 12.12. Counterparts. For the purpose of facilitating the execution of this Agreement and for other purposes, this Agreement may be executed simultaneously in any number of counterparts, each of which counterparts shall be deemed to be an original, and all of which counterparts shall constitute but one and the same instrument.

Section 12.13. Communication by Certificateholders with other Certificateholders. Certificateholders of any series may communicate with other Certificateholders of such series

[Pass Through Trust Agreement]

with respect to their rights under this Basic Agreement, the related Trust Supplement or the Certificates of such series pursuant to Section 312(b) of the Trust Indenture Act. The Company, the Trustee and any and all other persons benefited by this Agreement shall have the protection afforded by Section 312(c) of the Trust Indenture Act.

Section 12.14. Intention of Parties. The parties hereto intend that each Trust be classified for U.S. federal income tax purposes as a grantor trust under Subpart E, Part I of Subchapter J of the Internal Revenue Code of 1986, as amended, and not as a trust or association taxable as a corporation or as a partnership. The powers granted and obligations undertaken pursuant to this Agreement shall be so construed so as to further such intent.

* * *

[Pass Through Trust Agreement]

IN WITNESS WHEREOF, the parties have caused this Agreement to be duly executed by their respective officers thereunto duly authorized as of the day and year first written above.


UNITED AIR LINES, INC.

By:		/s/ Stephen Lieberman
Name:		Stephen Lieberman
Title:		Vice President and Treasurer

WILMINGTON TRUST COMPANY, as Trustee

By:		/s/ W. Chris Sponenberg
Name:		W. Chris Sponenberg
Title:		Vice President

Trust Supplement No. 2007-1A, dated as of June 26, 2007

Exhibit 4.5

TRUST SUPPLEMENT NO. 2007-1A

dated as of June 26, 2007

between

WILMINGTON TRUST COMPANY

as Trustee,

and

UNITED AIR LINES, INC.

PASS THROUGH TRUST AGREEMENT

dated as of June 26, 2007

$485,086,000

United Air Lines Pass Through Trust 2007-1A

United Air Lines

Pass Through Certificates,

Series 2007-1A

Vedder, Price, Kaufman & Kammholz, P.C.

Chicago, Illinois

TABLE OF CONTENTS


				Page
ARTICLE I		THE CERTIFICATES		2

	Section 1.01.		The Certificates	2

ARTICLE II		DEFINITIONS		3

	Section 2.01.		Definitions	3

ARTICLE III		DEFAULT		6

	Section 3.01.		Purchase Rights of Certificateholders	6

ARTICLE IV		THE TRUSTEE		9

	Section 4.01.		Delivery of Documents; Delivery Dates	9
	Section 4.02.		The Trustee	9
	Section 4.03.		Representations and Warranties of the Trustee	9
	Section 4.04.		Trustee Liens	10
	Section 4.05.		Trustee Reports	10

ARTICLE V		ADDITIONAL AMENDMENT; SUPPLEMENTAL AGREEMENTS		11

	Section 5.01.		Supplemental Agreements Without Consent of Applicable Certificateholders	11
	Section 5.02.		Consent of Holders of Certificates Issued under other Trusts	11

ARTICLE VI		MISCELLANEOUS PROVISIONS		11

	Section 6.01.		Basic Agreement Ratified	11
	Section 6.02.		GOVERNING LAW	12
	Section 6.03.		Execution in Counterparts	12
	Section 6.04.		Intention of Parties	12


Exhibit A	–	Form of Certificate
Exhibit B	–	DTC Letter of Representations

THIS TRUST SUPPLEMENT NO. 2007-1A, dated as of June 26, 2007 (herein called the “Trust Supplement”), between United Air Lines, Inc., a Delaware corporation (the “Company”), and Wilmington Trust Company (the “Trustee”), to the Pass Through Trust Agreement, dated as of June 26, 2007, between the Company and the Trustee (the “Basic Agreement”).

W I T N E S S E T H:

WHEREAS, the Basic Agreement, unlimited as to the aggregate principal amount of Certificates (unless otherwise specified herein, capitalized terms used herein without definition having the respective meanings specified in the Basic Agreement) which may be issued thereunder, has heretofore been executed and delivered;

WHEREAS, the Company intends to finance certain Aircraft through separate secured loan transactions, under which the Company will own such Aircraft (collectively, the “Aircraft”);

WHEREAS, in the case of each Aircraft, the Company will issue pursuant to an Indenture, on a recourse basis, Equipment Notes secured by such Aircraft;

WHEREAS, the Trustee hereby declares the creation of the United Air Lines Pass Through Trust 2007-1A (the “Applicable Trust”) for the benefit of the Applicable Certificateholders, and the initial Applicable Certificateholders as the grantors of the Applicable Trust, by their respective acceptances of the Applicable Certificates, join in the creation of the Applicable Trust with the Trustee;

WHEREAS, all Certificates to be issued by the Applicable Trust will evidence fractional undivided interests in the Applicable Trust and will convey no rights, benefits or interests in respect of any property other than the Trust Property;

WHEREAS, pursuant to the terms and conditions of the Basic Agreement as supplemented by this Trust Supplement (the “Agreement”) and the Note Purchase Agreement, the Trustee on behalf of the Applicable Trust, using funds from the sale of the Applicable Certificates, shall purchase one or more Equipment Notes having the same interest rate as, and final maturity date not later than the final Regular Distribution Date of, the Applicable Certificates issued hereunder and shall hold such Equipment Notes in trust for the benefit of the Applicable Certificateholders;

WHEREAS, all of the conditions and requirements necessary to make this Trust Supplement, when duly executed and delivered, a valid, binding and legal instrument in accordance with its terms and for the purposes herein expressed, have been done, performed and fulfilled, and the execution and delivery of this Trust Supplement in the form and with the terms hereof have been in all respects duly authorized;

WHEREAS, this Trust Supplement is subject to the provisions of the Trust Indenture Act of 1939, as amended, and shall, to the extent applicable, be governed by such provisions;

[Trust Supplement No. 2007-1A]

NOW THEREFORE, in consideration of the premises herein, it is agreed between the Company and the Trustee as follows:

ARTICLE I

THE CERTIFICATES

Section 1.01. The Certificates. There is hereby created a series of Certificates to be issued under the Agreement to be distinguished and known as “United Air Lines Pass Through Certificates, Series 2007-1A” (hereinafter defined as the “Applicable Certificates”). Each Applicable Certificate represents a fractional undivided interest in the Applicable Trust created hereby. The Applicable Certificates shall be the only instruments evidencing a fractional undivided interest in the Applicable Trust.

The terms and conditions applicable to the Applicable Certificates are as follows:

(a) The aggregate principal amount of the Applicable Certificates that shall be authenticated under the Agreement (except for Applicable Certificates authenticated and delivered under Sections 3.03, 3.04, 3.05 and 3.06 of the Basic Agreement) is $485,086,000.

(b) The Regular Distribution Dates with respect to any payment of Scheduled Payments means January 2 and July 2 of each year, commencing on January 2, 2008, until payment of all of the Scheduled Payments to be made under the Equipment Notes has been made.

(c) The Special Distribution Dates with respect to the Applicable Certificates means any Business Day on which a Special Payment is to be distributed pursuant to the Agreement.

(d) (i) The Applicable Certificates shall be in the form attached hereto as Exhibit A. Any Person acquiring or accepting an Applicable Certificate or an interest therein will, by such acquisition or acceptance, be deemed to represent and warrant to and for the benefit of the Company that either (i) the assets of an employee benefit plan subject to Title I of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), or of a plan subject to Section 4975 of the Internal Revenue Code of 1986, as amended (the “Code”), have not been used to purchase or hold Applicable Certificates or an interest therein or (ii) the purchase and holding of Applicable Certificates or an interest therein is exempt from the prohibited transaction restrictions of ERISA and the Code pursuant to one or more prohibited transaction statutory or administrative exemptions. In addition, the Applicable Certificate will bear a legend regarding ERISA compliance matters.

(ii) The Applicable Certificates shall be Book-Entry Certificates and shall be subject to the conditions set forth in the Letter of Representations between the Company and the Clearing Agency attached hereto as Exhibit B.

(e) The Applicable Certificates are subject to the Intercreditor Agreement.

[Trust Supplement No. 2007-1A]

(f) The Applicable Certificates are entitled to the benefits of the Liquidity Facility.

(g) The Equipment Notes to be acquired and held in the Applicable Trust, and the related Aircraft and Note Documents, are described in the Note Purchase Agreement.

(h) The Cut-off Date is July 4, 2007.

ARTICLE II

DEFINITIONS

Section 2.01. Definitions. For all purposes of the Basic Agreement as supplemented by this Trust Supplement, the following capitalized terms have the following meanings (any capitalized term used herein but not defined shall have the meaning assigned to it in the Basic Agreement, and any term used herein which is defined in both this Trust Supplement and the Basic Agreement shall have the meaning assigned thereto in this Trust Supplement for purposes of the Basic Agreement as supplemented by this Trust Supplement):

Agreement: Has the meaning specified in the recitals hereto.

Aircraft: Means each of the Aircraft in respect of which a Participation Agreement is entered into in accordance with the Note Purchase Agreement (or any substitute aircraft, including engines therefor, owned by the Company and securing one or more Equipment Notes).

Applicable Certificate: Has the meaning specified in Section 1.01 of this Trust Supplement.

Applicable Certificateholder: Means the Person in whose name an Applicable Certificate is registered on the Register for the Applicable Certificates.

Applicable Trust: Has the meaning specified in the recitals hereto.

Basic Agreement: Has the meaning specified in the first paragraph of this Trust Supplement.

Business Day: Means any day other than a Saturday, a Sunday or a day on which commercial banks are required or authorized to close in Chicago, Illinois, New York, New York, or, so long as any Applicable Certificate of such series is outstanding, the city and state in which the Trustee or any related Loan Trustee maintains its corporate trust office or receives and disburses funds.

Certificate: Has the meaning specified in the Intercreditor Agreement.

[Trust Supplement No. 2007-1A]

Section 1110(a)(2)(A) of the U.S. Bankruptcy Code to perform all of its obligations under all of the Indentures or, if it has entered into such agreements, has at any time thereafter failed to cure any default under any of the Indentures in accordance with Section 1110(a)(2)(B) of the Bankruptcy Code; or (B) if prior to the expiry of the 60-Day Period, United shall have abandoned any Aircraft.

Class: Has the meaning specified in the Intercreditor Agreement.

Company: Has the meaning specified in the first paragraph of this Trust Supplement.

Controlling Party: Has the meaning specified in the Intercreditor Agreement.

Distribution Date: Means any Regular Distribution Date or Special Distribution Date as the context requires.

Final Maturity Date: Means January 2, 2024.

Intercreditor Agreement: Means the Intercreditor Agreement dated as of June 26, 2007 among the Trustee, the Other Trustees, the Liquidity Provider, the liquidity provider relating to the Class B Certificates and Wilmington Trust Company, as Subordination Agent and as trustee thereunder, as amended, supplemented or otherwise modified from time to time in accordance with its terms.

Investors: Means the Underwriters, together with all subsequent beneficial owners of the Applicable Certificates.

Liquidity Facility: Means, initially, the Revolving Credit Agreement dated as of June 26, 2007 relating to the Applicable Certificates, between the Liquidity Provider and Wilmington Trust Company, as Subordination Agent, as agent and trustee for the Applicable Trust, and, from and after the replacement of such agreement pursuant to the Intercreditor Agreement, the replacement liquidity facility therefor, in each case as amended, supplemented or otherwise modified from time to time in accordance with their respective terms.

Liquidity Provider: Means, initially, Morgan Stanley Senior Funding, Inc., a corporation duly established under the laws of the State of Delaware, and any replacements or successors therefor appointed in accordance with the Intercreditor Agreement.

Note Documents: Means the Equipment Notes with respect to the Applicable Certificates and, with respect to any such Equipment Note, the Indenture, the Parent Guarantee and the Participation Agreement relating to such Equipment Note.

Note Purchase Agreement: Means the Note Purchase Agreement dated as of June 26, 2007 among the Trustee, the Other Trustees, the Company and the Subordination Agent, providing for, among other things, the purchase of Equipment Notes by the Trustee on behalf of the Applicable Trust, as the same may be amended, supplemented or otherwise modified from time to time, in accordance with its terms.

[Trust Supplement No. 2007-1A]

Other Agreements: Means (i) the Basic Agreement as supplemented by Trust Supplement No. 2007-1B dated as of the date hereof relating to United Air Lines Pass Through Trust 2007-1B, (ii) the Basic Agreement as supplemented by Trust Supplement No. 2007-1C dated as of the date hereof relating to United Air Lines Pass Through Trust 2007-1C, (iii) the Basic Agreement as supplemented by a Trust Supplement relating to any Additional Trust and (iv) the Basic Agreement as supplemented by a Trust Supplement relating to any Refinancing Trust.

Other Trustees: Means the trustees under the Other Agreements, and any successor or other trustee appointed as provided therein.

Other Trusts: Means the United Air Lines Pass Through Trust 2007-1B, the United Air Lines Pass Through Trust 2007-1C, an Additional Trust or Trusts, if any, and a Refinancing Trust or Trusts, if any, created by the Other Agreements.

Prospectus Supplement: Means the final Prospectus Supplement dated June 19, 2007 relating to the offering of the Applicable Certificates, the Class B and the Class C Certificates.

Ratings Confirmation: Has the meaning specified in the Intercreditor Agreement.

Scheduled Payment: Means, with respect to any Equipment Note, (i) any payment of principal or interest on such Equipment Note (other than any such payment which is not in fact received by the Trustee or any Subordination Agent within ten (10) Business Days of the date on which such payment is scheduled to be made) or (ii) any payment of interest on the Applicable Certificates with funds drawn under the Liquidity Facility, which payment in any such case represents the installment of principal on such Equipment Note at the stated maturity of such installment, the payment of regularly scheduled interest accrued on the unpaid principal amount of such Equipment Note, or both; provided, however, that any payment of principal, premium, if any, Break Amount, if any, or interest resulting from the redemption or purchase of any Equipment Note shall not constitute a Scheduled Payment.

Special Payment: Means any payment (other than a Scheduled Payment) in respect of, or any proceeds of, any Equipment Note or Collateral (as defined in each Indenture).

Triggering Event: Has the meaning assigned to such term in the Intercreditor Agreement.

Trust Property: Means (i) subject to the Intercreditor Agreement, the Equipment Notes held as the property of the Applicable Trust, the Parent Guarantee with respect to such Equipment Notes, all monies at any time paid thereon and all monies due and to become due thereunder, (ii) funds from time to time deposited in the Certificate Account and the Special Payments Account and, subject to the Intercreditor Agreement, any proceeds from the sale by the Trustee pursuant to Article VI of the Basic Agreement of any Equipment Note and (iii) all rights of the Applicable Trust and the Trustee, on behalf of the Applicable Trust, under the Intercreditor Agreement, the Note Purchase Agreement and the Liquidity Facility, including, without limitation, all rights to receive certain payments thereunder, and all monies paid to the Trustee on behalf of the Applicable Trust pursuant to the Intercreditor Agreement or the Liquidity Facility.

[Trust Supplement No. 2007-1A]

Trust Supplement: Has the meaning specified in the first paragraph of this trust supplement.

Trustee: Has the meaning specified in the first paragraph of this Trust Supplement.

Underwriters: Means, collectively, Morgan Stanley & Co. Incorporated and Credit Suisse Securities (USA) LLC.

Underwriting Agreement: Means the Underwriting Agreement dated June 19, 2007 among the Underwriters and the Company, as the same may be amended, supplemented or otherwise modified from time to time in accordance with its terms.

United Bankruptcy Event: Has the meaning specified in the Intercreditor Agreement.

ARTICLE III

DEFAULT

Section 3.01. Purchase Rights of Certificateholders. (a) By acceptance of its Applicable Certificate, each Applicable Certificateholder agrees that at any time after the occurrence and during the continuation of a Certificate Buyout Event:

(i) each Class B Certificateholder (other than the Company or any of its Affiliates) shall have the right to purchase all, but not less than all, of the Applicable Certificates upon 15 days’ written notice to the Trustee and each other Class B Certificateholder, on the third Business Day next following the expiry of such 15-day notice period, provided that (A) if prior to the end of such 15 day period any other Class B Certificateholder (other than the Company or any of its Affiliates) notifies such purchasing Class B Certificateholder that such other Class B Certificateholder wants to participate in such purchase, then such other Class B Certificateholder (other than the Company or any of its Affiliates) may join with the purchasing Class B Certificateholder to purchase all, but not less than all, of the Applicable Certificates pro rata based on the Fractional Undivided Interest in the Class B Trust held by each such Class B Certificateholder and (B) if prior to the end of such 15 day period any other Class B Certificateholder fails to notify the purchasing Class B Certificateholder of such other Class B Certificateholder’s desire to participate in such a purchase, then such other Class B Certificateholder shall lose its right to purchase the Applicable Certificates pursuant to this Section 3.01(a)(i);

(ii) each Class C Certificateholder (other than the Company or any of its Affiliates) shall have the right (which shall not expire upon any purchase of the Applicable Certificates pursuant to clause (i) above) to purchase all, but not less than all, of the Applicable Certificates and the Class B Certificates upon 15 days’ written notice to the Trustee, the Class B Trustee and each other Class C Certificateholder, on the third Business Day next following the expiry of such 15-day notice period, provided that (A) if prior to the end of such 15 day period any other Class C Certificateholder (other than the Company or any of its Affiliates) notifies such purchasing Class C Certificateholder that such other Class C Certificateholder wants to participate in such purchase, then such

[Trust Supplement No. 2007-1A]

other Class C Certificateholder (other than the Company or any of its Affiliates) may join with the purchasing Class C Certificateholder to purchase all, but not less than all, of the Applicable Certificates and the Class B Certificates pro rata based on the Fractional Undivided Interest in the Class C Trust held by each such Class C Certificateholder and (B) if prior to the end of such 15 day period any other Class C Certificateholder fails to notify the purchasing Class C Certificateholder of such other Class C Certificateholder’s desire to participate in such a purchase, then such other Class C Certificateholder shall lose its right to purchase the Applicable Certificates and the Class B Certificates pursuant to this Section 3.01(a)(ii);

(iii) if any Additional Certificates are issued pursuant to one or more Additional Trusts, each Additional Certificateholder (other than the Company or any of its Affiliates), shall have the right (which shall not expire upon any purchase of the Applicable Certificates pursuant to clauses (i) or (ii) above) to purchase all, but not less than all, of the Applicable Certificates, the Class B Certificates, the Class C Certificates and any Additional Certificates ranked senior to the Additional Certificates held by the purchasing Additional Certificateholders upon 15 days’ written notice to the Trustee, the Class B Trustee, the Class C Trustee, any Additional Trustee with respect to Additional Certificates that rank senior to the Additional Certificates held by the purchasing Additional Certificateholders and each other Additional Certificateholder of the same Class, on the third Business Day next following the expiry of such 15-day notice period, provided that (A) if prior to the end of such 15 day period any other Additional Certificateholder of such Class (other than the Company or any of its Affiliates) notifies such purchasing Additional Certificateholder that such other Additional Certificateholder wants to participate in such purchase, then such other Additional Certificateholder (other than the Company or any of its Affiliates) may join with the purchasing Additional Certificateholder to purchase all, but not less than all, of the Applicable Certificates, the Class B Certificates, the Class C Certificates and such senior Additional Certificates pro rata based on the Fractional Undivided Interest in the applicable Additional Trust held by each such Additional Certificateholder and (B) if prior to the end of such 15 day period any other Additional Certificateholder of such Class fails to notify the purchasing Additional Certificateholder of such other Additional Certificateholder’s desire to participate in such a purchase, then such other Additional Certificateholder shall lose its right to purchase the Applicable Certificates, the Class B Certificates, the Class C Certificates and such senior Additional Certificates pursuant to this Section 3.01(a)(iii).

(iv) if any Refinancing Certificates are issued, each Refinancing Certificateholder shall have the same right (subject to the same terms and conditions) to purchase Certificates pursuant to this Section 3.01(a) (and to receive notice in connection therewith) as the Certificateholders of the Class that such Refinancing Certificates refinanced.

[Trust Supplement No. 2007-1A]

however, that no such purchase of Applicable Certificates shall be effective unless the purchaser(s) shall certify to the Trustee that contemporaneously with such purchase, such purchaser(s) is (are) purchasing, pursuant to the terms of the Agreement and the Other Agreements, (A) in the case of any purchase of the Applicable Certificates pursuant to clause (i) above, all of the Applicable Certificates, (B) in the case of any purchase of the Applicable Certificates pursuant to clause (ii) above, all of the Applicable Certificates and the Class B Certificates, or (C) in all other cases, the Applicable Certificates, the Class B Certificates, the Class C Certificates and, if applicable, the Additional Certificates that are senior to the securities held by such purchaser(s). Each payment of the purchase price of the Applicable Certificates referred to in the first sentence hereof shall be made to an account or accounts designated by the Trustee and each such purchase shall be subject to the terms of this Section 3.01. Each Applicable Certificateholder agrees by its acceptance of its Applicable Certificate that (at any time after the occurrence of a Certificate Buyout Event) it will, upon payment from such Class B Certificateholder(s), Class C Certificateholder(s), Additional Certificateholder(s) or Refinancing Certificateholders, as the case may be, of the purchase price set forth in the first sentence of this paragraph, (i) forthwith sell, assign, transfer and convey to the purchaser(s) thereof (without recourse, representation or warranty of any kind except for its own acts), all of the right, title, interest and obligation of such Applicable Certificateholder in the Agreement, the Intercreditor Agreement, the Liquidity Facility, the Note Purchase Agreement, the Note Documents and all Applicable Certificates held by such Applicable Certificateholder (excluding all right, title and interest under any of the foregoing to the extent such right, title or interest is with respect to an obligation not then due and payable as respects any action or inaction or state of affairs occurring prior to such sale) (and the purchaser shall assume all of such Applicable Certificateholder’s obligations under the Agreement, the Intercreditor Agreement, the Liquidity Facility, the Note Purchase Agreement, the Note Documents and all such Applicable Certificates), (ii) if such purchase occurs after a Record Date relating to any distribution and prior to or on the related Distribution Date, forthwith turn over to the purchaser(s) of its Applicable Certificate all amounts, if any, received by it on account of such distribution. The Applicable Certificates will be deemed to be purchased on the date payment of the purchase price is made notwithstanding the failure of the Applicable Certificateholders to deliver any Applicable Certificates and, upon such a purchase, (I) the only rights of the Applicable Certificateholders will be to deliver the Applicable Certificates to the purchaser(s) and receive the purchase price for such Applicable Certificates and (II) if the purchaser(s) shall so request, such Applicable Certificateholder will comply with all the provisions of Section 3.04 of the Basic Agreement to enable new Applicable Certificates to be issued to the purchaser in such denominations as it shall request. All charges and expenses in connection with the issuance of any such new Applicable Certificates shall be borne by the purchaser thereof.

As used in this Section 3.01 and elsewhere in this Trust Supplement, the terms “Additional Certificate”, “Additional Certificateholder”, “Additional Equipment Notes”, “Additional Trust”, “Additional Trust Agreement”, “Additional Trustee”, “Class B Certificate”, “Class B Certificateholder”, “Class B Trust”, “Class B Trust Agreement”, “Class B Trustee”, “Class C Certificate”, “Class C Certificateholder”, “Class C Trust”, “Class C Trust Agreement”, “Class C Trustee”, “Refinancing Certificates”, “Refinancing Certificateholder”, “Refinancing Equipment Notes” and “Refinancing Trust” shall have the respective meanings assigned to such terms in the Intercreditor Agreement.

[Trust Supplement No. 2007-1A]

(b) This Section 3.01 supersedes and replaces Section 6.01(b) of the Basic Agreement, with respect to the Applicable Trust.

ARTICLE IV

THE TRUSTEE

Section 4.01. Delivery of Documents; Delivery Dates. The Trustee is hereby directed (i) to execute and deliver the Intercreditor Agreement and the Note Purchase Agreement on or prior to the Issuance Date, each in the form delivered to the Trustee by the Company, and (ii) subject to the respective terms thereof, to perform its obligations thereunder. Upon request of the Company and the satisfaction or waiver of the closing conditions specified in the Underwriting Agreement, the Trustee shall execute, deliver, authenticate, issue and sell Applicable Certificates in authorized denominations equaling in the aggregate the amount set forth, with respect to the Applicable Trust, in Schedule I to the Underwriting Agreement evidencing the entire ownership interest in the Applicable Trust, which amount equals the maximum aggregate principal amount of Equipment Notes which may be purchased by the Trustee pursuant to the Note Purchase Agreement. Except as provided in Sections 3.03 and 3.06 of the Basic Agreement, the Trustee shall not execute, authenticate or deliver Applicable Certificates in excess of the aggregate amount specified in this paragraph. The provisions of this Section 4.01 supersede and replace the first sentence of Section 4.02(a) of the Basic Agreement, with respect to the Applicable Trust.

Section 4.02. The Trustee. (a) Subject to Section 4.03 of this Trust Supplement and Section 7.15 of the Basic Agreement, the Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Trust Supplement or the Note Purchase Agreement or the due execution hereof or thereof by the Company or the other parties thereto (other than the Trustee), or for or in respect of the recitals and statements contained herein or therein, all of which recitals and statements are made solely by the Company, except that the Trustee hereby represents and warrants that each of this Trust Supplement, the Basic Agreement, each Applicable Certificate, the Intercreditor Agreement and the Note Purchase Agreement has been executed and delivered by one of its officers who is duly authorized to execute and deliver such document on its behalf.

(b) Except as herein otherwise provided and except during the continuation of an Event of Default in respect of the Applicable Trust created hereby, no duties, responsibilities or liabilities are assumed, or shall be construed to be assumed, by the Trustee by reason of this Trust Supplement other than as set forth in the Agreement, and this Trust Supplement is executed and accepted on behalf of the Trustee, subject to all the terms and conditions set forth in the Agreement, as fully to all intents as if the same were herein set forth at length.

Section 4.03. Representations and Warranties of the Trustee. The Trustee hereby represents and warrants that:

[Trust Supplement No. 2007-1A]

authorize the execution, delivery and performance by it of this Trust Supplement, the Intercreditor Agreement, the Note Purchase Agreement and the Note Documents to which it is or is to become a party;

(b) the execution, delivery and performance by the Trustee of this Trust Supplement, the Intercreditor Agreement, the Note Purchase Agreement and the Note Documents to which it is or is to become a party (i) will not violate any provision of any United States federal law or the law of the state of the United States where it is located governing the banking and trust powers of the Trustee or any order, writ, judgment, or decree of any court, arbitrator or governmental authority applicable to the Trustee or any of its assets, (ii) will not violate any provision of the articles of association or by-laws of the Trustee, and (iii) will not violate any provision of, or constitute, with or without notice or lapse of time, a default under, or result in the creation or imposition of any lien on any properties included in the Trust Property pursuant to the provisions of any mortgage, indenture, contract, agreement or other undertaking to which it is a party, which violation, default or lien could reasonably be expected to have an adverse effect on the Trustee’s performance or ability to perform its duties hereunder or thereunder or on the transactions contemplated herein or therein;

(c) the execution, delivery and performance by the Trustee of this Trust Supplement, the Intercreditor Agreement, the Note Purchase Agreement and the Note Documents to which it is or is to become a party will not require the authorization, consent, or approval of, the giving of notice to, the filing or registration with, or the taking of any other action in respect of, any governmental authority or agency of the United States or the state of the United States where it is located regulating the banking and corporate trust activities of the Trustee; and

(d) this Trust Supplement, the Intercreditor Agreement, the Note Purchase Agreement and the Note Documents to which it is or is to become a party have been, or will be, as applicable, duly executed and delivered by the Trustee and constitute, or will constitute, as applicable, the legal, valid and binding agreements of the Trustee, enforceable against it in accordance with their respective terms; provided, however, that enforceability may be limited by (i) applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the rights of creditors generally and (ii) general principles of equity.

Section 4.04. Trustee Liens. The Trustee in its individual capacity agrees, in addition to the agreements contained in Section 7.17 of the Basic Agreement, that it will at its own cost and expense promptly take any action as may be necessary to duly discharge and satisfy in full any Trustee’s Liens on or with respect to the Trust Property which is attributable to the Trustee in its individual capacity and which is unrelated to the transactions contemplated by the Intercreditor Agreement or the Note Purchase Agreement.

Section 4.05. Trustee Reports. Promptly following any early redemption or purchase of, or any default in the payment of principal or interest in respect of, any of the Equipment Notes held in the Applicable Trust, the Trustee shall furnish to Applicable Certificateholders of record on such date a statement setting forth (x) the expected Pool Balances for each subsequent Regular Distribution Date, (y) the related Pool Factors for such Regular Distribution Dates and (z) the expected principal distribution schedule of the Equipment Notes, in the aggregate, held as

[Trust Supplement No. 2007-1A]

Trust Property of such Applicable Trust at the date of such notice. With respect to the Applicable Certificates registered in the name of a Clearing Agency or its nominee, on any date on which the Trustee is required to a statement as provided above, the Trustee will request that such Clearing Agency post on its Internet bulletin board a securities position listing setting forth the names of all Clearing Agency Participants reflected on such Clearing Agency’s books as holding interests in the Applicable Certificates on such date. The Trustee will mail to each such Clearing Agency Participant the statement described above and will make available additional copies as requested by such Clearing Agency Participant for forwarding to holders of interests in the Applicable Certificates.

ARTICLE V

ADDITIONAL AMENDMENT; SUPPLEMENTAL AGREEMENTS

Section 5.01. Supplemental Agreements Without Consent of Applicable Certificateholders. Without limitation of Section 9.01 of the Basic Agreement, under the terms of, and subject to the limitations contained in, Section 9.01 of the Basic Agreement, the Company may (but will not be required to), and the Trustee (subject to Section 9.03 of the Basic Agreement) shall, at the Company’s request, at any time and from time to time, (i) enter into one or more agreements supplemental to the Agreement, the Intercreditor Agreement or the Note Purchase Agreement to provide for the formation of one or more Additional Trusts, the issuance of Additional Certificates, the purchase by any Additional Trust of applicable Additional Equipment Notes and other matters incidental thereto or otherwise contemplated by Section 2.01(b) of the Basic Agreement, subject to the provisions of Section 4(a)(i) of the Note Purchase Agreement and Section 9.1 of the Intercreditor Agreement, and (ii) enter into one or more agreements supplemental to the Agreement to provide for the formation of one or more Refinancing Trusts, the issuance of Refinancing Certificates, the purchase by any Refinancing Trust of applicable Refinancing Equipment Notes and other matters incidental thereto or as otherwise contemplated by Section 2.01(b) of the Basic Agreement, subject to the provisions of Section 4(a)(i) of the Note Purchase Agreement and Section 9.1(c) of the Intercreditor Agreement.

Section 5.02. Consent of Holders of Certificates Issued under other Trusts. Notwithstanding any provision in Section 5.01 of this Trust Supplement to the contrary, no amendment or modification of Section 3.01 of this Trust Supplement shall be effective unless the trustee for each Class of Certificates affected by such amendment or modification shall have consented thereto.

ARTICLE VI

MISCELLANEOUS PROVISIONS

Section 6.01. Basic Agreement Ratified. Except and so far as herein expressly provided, all of the provisions, terms and conditions of the Basic Agreement are in all respects ratified and confirmed; and the Basic Agreement and this Trust Supplement shall be taken, read and construed as one and the same instrument. All replacements of provisions of, and other modifications of the Basic Agreement set forth in this Trust Supplement are solely with respect to the Applicable Trust.

[Trust Supplement No. 2007-1A]

Section 6.02. GOVERNING LAW. THIS AGREEMENT SHALL IN ALL RESPECTS BE GOVERNED BY THE LAW OF THE STATE OF NEW YORK, INCLUDING ALL MATTERS OF CONSTRUCTION, VALIDITY AND PERFORMANCE. THIS AGREEMENT IS BEING DELIVERED IN THE STATE OF NEW YORK.

Section 6.03. Execution in Counterparts. This Trust Supplement may be executed in any number of counterparts, each of which shall be an original, but such counterparts shall together constitute but one and the same instrument.

Section 6.04. Intention of Parties. The parties hereto intend that the Applicable Trust be classified for U.S. federal income tax purposes as a grantor trust under Subpart E, Part I of Subchapter J of the Internal Revenue Code of 1986, as amended, and not as a trust or association taxable as a corporation or as a partnership. Each Applicable Certificateholder and Investor, by its acceptance of its Applicable Certificate or a beneficial interest therein, agrees to treat the Applicable Trust as a grantor trust for all U.S. federal, state and local income tax purposes. The powers granted and obligations undertaken pursuant to the Agreement shall be so construed so as to further such intent.

[Trust Supplement No. 2007-1A]

IN WITNESS WHEREOF, the Company and the Trustee have caused this Trust Supplement to be duly executed by their respective officers thereto duly authorized, as of the day and year first written above.


UNITED AIR LINES, INC.

By:		/s/ Stephen Lieberman
Name:		Stephen Lieberman
Title:		Vice President and Treasurer

WILMINGTON TRUST COMPANY, as Trustee

By:		/s/ W. Chris Sponenberg
Name:		W. Chris Sponenberg
Title:		Vice President

[Trust Supplement No. 2007-1A]

EXHIBIT A

FORM OF CERTIFICATE

Certificate

No.

[Unless this certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”), to Issuer or its agent for registration of transfer, exchange or payment, and any certificate issued is registered in the name of Cede & Co. or in such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch the registered owner hereof, Cede & Co., has an interest herein.]*

EITHER: (A) THE HOLDER IS NOT ACQUIRING THIS CERTIFICATE OR AN INTEREST HEREIN WITH PLAN ASSETS OF ANY PLAN OR AN INDIVIDUAL RETIREMENT PLAN SUBJECT TO TITLE I OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED (“ERISA”), OR SECTION 4975 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED (THE “CODE”); OR (B) THE HOLDER’S PURCHASE AND HOLDING OF THIS CERTIFICATE OR AN INTEREST HEREIN ARE EXEMPT FROM THE PROHIBITED TRANSACTION RESTRICTIONS OF SECTION 406(A) OF ERISA AND SECTION 4975 OF THE CODE BY AN ADMINISTRATIVE CLASS PROHIBITED TRANSACTION EXEMPTION GRANTED BY THE DEPARTMENT OF LABOR.

UNITED AIR LINES PASS THROUGH TRUST 2007-1A

United Air Lines Pass Through Certificate, Series 2007-1A

Issuance Date: June 26, 2007

Final Maturity Date: January 2, 2024

Evidencing A Fractional Undivided Interest In The United Air Lines Pass Through Trust 2007-1A, The Property Of Which Shall Include Certain Equipment Notes Each Secured By An Aircraft Owned By United Air Lines, Inc.

$[ ] Fractional Undivided Interest

representing [0.000xxxxxxx%] of the Trust per $1,000 face amount

THIS CERTIFIES THAT , for value received, is the registered owner of a $ ( DOLLARS)

*	This legend to appear on Book-Entry Certificates to be deposited with the Depository Trust Company.

EXHIBIT A

Page 1

[Trust Supplement No. 2007-1A]

Fractional Undivided Interest in the United Air Lines Pass Through Trust 2007-1A (the “Trust”) created by Wilmington Trust Company, as trustee (the “Trustee”), pursuant to a Pass Through Trust Agreement, dated as of June 26, 2007 (the “Basic Agreement”), between the Trustee and United Air Lines, Inc., a Delaware corporation (the “Company”), as supplemented by Trust Supplement No. 2007-1A thereto, dated as of June 26, 2007 (the “Trust Supplement” and, together with the Basic Agreement, the “Agreement”), between the Trustee and the Company, a summary of certain of the pertinent provisions of which is set forth below. To the extent not otherwise defined herein, the capitalized terms used herein have the meanings assigned to them in the Agreement. This Certificate is one of the duly authorized Certificates designated as “United Air Lines Pass Through Certificates, Series 2007-1A” (herein called the “Certificates”). This Certificate is issued under and is subject to the terms, provisions and conditions of the Agreement. By virtue of its acceptance hereof, the holder of this Certificate (the “Certificateholder” and, together with all other holders of Certificates issued by the Trust, the “Certificateholders”) assents to and agrees to be bound by the provisions of the Agreement and the Intercreditor Agreement. The property of the Trust includes certain Equipment Notes, the Parent Guarantee with respect to such Equipment Notes and all rights of the Trust to receive payments under the Intercreditor Agreement and the Liquidity Facility (the “Trust Property”). Each issue of the Equipment Notes is secured by, among other things, a security interest in an Aircraft owned by the Company.

The Certificates represent Fractional Undivided Interests in the Trust and the Trust Property and have no rights, benefits or interest in respect of any other separate trust established pursuant to the terms of the Basic Agreement for any other series of certificates issued pursuant thereto.

Subject to and in accordance with the terms of the Agreement and the Intercreditor Agreement, from funds then available to the Trustee, there will be distributed on January 2 and July 2 of each year (a “Regular Distribution Date”) commencing January 2, 2008, to the Person in whose name this Certificate is registered at the close of business on the 15th day preceding the Regular Distribution Date, an amount in respect of the Scheduled Payments on the Equipment Notes due on such Regular Distribution Date, the receipt of which has been confirmed by the Trustee, equal to the product of the percentage interest in the Trust evidenced by this Certificate and an amount equal to the sum of such Scheduled Payments. Subject to and in accordance with the terms of the Agreement and the Intercreditor Agreement, in the event that Special Payments on the Equipment Notes are received by the Trustee, from funds then available to the Trustee, there shall be distributed on the applicable Special Distribution Date, to the Person in whose name this Certificate is registered at the close of business on the 15th day preceding the Special Distribution Date, an amount in respect of such Special Payments on the Equipment Notes, the receipt of which has been confirmed by the Trustee, equal to the product of the percentage interest in the Trust evidenced by this Certificate and an amount equal to the sum of such Special Payments so received. If a Regular Distribution Date or Special Distribution Date is not a Business Day, distribution shall be made on the immediately following Business Day with the same force and effect as if made on such Regular Distribution Date or Special Distribution Date and interest shall accrue during the intervening period. The Trustee shall mail notice of each Special Payment and the Special Distribution Date therefor to the Certificateholder of this Certificate.

EXHIBIT A

Page 2

[Trust Supplement No. 2007-1A]

Distributions on this Certificate will be made by the Trustee by check mailed to the Person entitled thereto, without presentation or surrender of this Certificate or the making of any notation hereon, except that with respect to Certificates registered on the Record Date in the name of a Clearing Agency (or its nominee), such distribution shall be made by wire transfer. Except as otherwise provided in the Agreement and notwithstanding the above, the final distribution on this Certificate will be made after notice mailed by the Trustee of the pendency of such distribution and only upon presentation and surrender of this Certificate at the office or agency of the Trustee specified in such notice.

The Certificates do not represent a direct obligation of, or an obligation guaranteed by, or an interest in, the Company or the Trustee or any affiliate thereof. The Certificates are limited in right of payment, all as more specifically set forth on the face hereof and in the Agreement. All payments or distributions made to Certificateholders under the Agreement shall be made only from the Trust Property and only to the extent that the Trustee shall have sufficient income or proceeds from the Trust Property to make such payments in accordance with the terms of the Agreement. Each Certificateholder of this Certificate, by its acceptance hereof, agrees that it will look solely to the income and proceeds from the Trust Property to the extent available for distribution to such Certificateholder as provided in the Agreement. This Certificate does not purport to summarize the Agreement and reference is made to the Agreement for information with respect to the interests, rights, benefits, obligations, privileges, and duties evidenced hereby. A copy of the Agreement may be examined during normal business hours at the principal office of the Trustee, and at such other places, if any, designated by the Trustee, by any Certificateholder upon request.

The Agreement permits, with certain exceptions therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the rights of the Certificateholders under the Agreement at any time by the Company and the Trustee with the consent of the Certificateholders holding Certificates evidencing Fractional Undivided Interests aggregating not less than a majority in interest in the Trust. Any such consent by the Certificateholder of this Certificate shall be conclusive and binding on such Certificateholder and upon all future Certificateholders of this Certificate and of any Certificate issued upon the transfer hereof or in exchange hereof or in lieu hereof whether or not notation of such consent is made upon this Certificate. The Agreement also permits the amendment thereof, in certain limited circumstances, without the consent of the Certificateholders of any of the Certificates.

As provided in the Agreement and subject to certain limitations set forth therein, the transfer of this Certificate is registrable in the Register upon surrender of this Certificate for registration of transfer at the offices or agencies maintained by the Trustee in its capacity as Registrar, or by any successor Registrar, duly endorsed or accompanied by a written instrument of transfer in form satisfactory to the Trustee and the Registrar, duly executed by the Certificateholder hereof or such Certificateholder’s attorney duly authorized in writing, and thereupon one or more new Certificates of authorized denominations evidencing the same aggregate Fractional Undivided Interest in the Trust will be issued to the designated transferee or transferees.

The Certificates are issuable only as registered Certificates without coupons in minimum denominations of $1,000 Fractional Undivided Interest and integral multiples thereof, except that

EXHIBIT A

Page 3

[Trust Supplement No. 2007-1A]

one Certificate may be issued in a different denomination. As provided in the Agreement and subject to certain limitations therein set forth, the Certificates are exchangeable for new Certificates of authorized denominations evidencing the same aggregate Fractional Undivided Interest in the Trust, as requested by the Certificateholder surrendering the same.

No service charge will be made for any such registration of transfer or exchange, but the Trustee shall require payment of a sum sufficient to cover any tax or governmental charge payable in connection therewith.

Each Certificateholder and Investor, by its acceptance of this Certificate or a beneficial interest herein, agrees to treat the Trust as a grantor trust for all U.S. federal, state and local income tax purposes.

The Trustee, the Registrar, and any agent of the Trustee or the Registrar may treat the person in whose name this Certificate is registered as the owner hereof for all purposes, and neither the Trustee, the Registrar, nor any such agent shall be affected by any notice to the contrary.

The obligations and responsibilities created by the Agreement and the Trust created thereby shall terminate upon the distribution to Certificateholders of all amounts required to be distributed to them pursuant to the Agreement and the disposition of all property held as part of the Trust Property.

Any Person acquiring or accepting this Certificate or an interest herein will, by such acquisition or acceptance, be deemed to have represented and warranted to and for the benefit of the Company that either: (i) the assets of an employee benefit plan subject to Title I of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), or of a plan subject to Section 4975 of the Internal Revenue Code of 1986, as amended (the “Code”), have not been used to purchase or hold this Certificate or an interest herein or (ii) the purchase and holding of this Certificate or an interest herein are exempt from the prohibited transaction restrictions of ERISA and the Code pursuant to one or more prohibited transaction statutory or administrative exemptions.

THE RELATED PASS THROUGH TRUST AGREEMENT AND THIS CERTIFICATE SHALL BE GOVERNED AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.

Unless the certificate of authentication hereon has been executed by the Trustee, by manual signature, this Certificate shall not be entitled to any benefit under the Agreement or be valid for any purpose.

IN WITNESS WHEREOF, the Trustee has caused this Certificate to be duly executed.

EXHIBIT A

Page 4

[Trust Supplement No. 2007-1A]


UNITED AIR LINES PASS THROUGH TRUST 2007-1A

By:		WILMINGTON TRUST COMPANY, as Trustee

By:
Name:
Title:

EXHIBIT A

Page 5

[Trust Supplement No. 2007-1A]

FORM OF THE TRUSTEE’S CERTIFICATE OF AUTHENTICATION

This is one of the Certificates referred to in the within-mentioned Agreement.


WILMINGTON TRUST COMPANY, as Trustee

By:
Name:
Title:

EXHIBIT A

Page 6

[Trust Supplement No. 2007-1A]

EXHIBIT B

[DTC Letter of Representations]

EXHIBIT B

Page 1

Trust Supplement No. 2007-1B, dated as of June 26, 2007

Exhibit 4.6

TRUST SUPPLEMENT NO. 2007-1B

dated as of June 26, 2007

between

WILMINGTON TRUST COMPANY

as Trustee,

and

UNITED AIR LINES, INC.

PASS THROUGH TRUST AGREEMENT

dated as of June 26, 2007

$106,835,000

United Air Lines Pass Through Trust 2007-1B

United Air Lines

Pass Through Certificates,

Series 2007-1B

Vedder, Price, Kaufman & Kammholz, P.C.

Chicago, Illinois

TABLE OF CONTENTS


		Page
ARTICLE I	THE CERTIFICATES	2

Section 1.01.	The Certificates	2

ARTICLE II	DEFINITIONS	3

Section 2.01.	Definitions	3

ARTICLE III	DEFAULT	6

Section 3.01.	Purchase Rights of Certificateholders	6

ARTICLE IV	THE TRUSTEE	9

Section 4.01.	Delivery of Documents; Delivery Dates	9
Section 4.02.	The Trustee	9
Section 4.03.	Representations and Warranties of the Trustee	10
Section 4.04.	Trustee Liens	11
Section 4.05.	Trustee Reports	11

ARTICLE V	TRANSFER OF THE APPLICABLE CERTIFICATES	11

Section 5.01.	Restrictive Legends	11
Section 5.02.	Amendment of Section 3.04 of the Basic Agreement	12
Section 5.03.	Transfer and Exchange	12
Section 5.04.	Special Transfer Provisions	13

ARTICLE VI	ADDITIONAL AMENDMENT; SUPPLEMENTAL AGREEMENTS	14

Section 6.01.	Supplemental Agreements Without Consent of Applicable Certificateholders	14
Section 6.02.	Consent of Holders of Certificates Issued under other Trusts	14

ARTICLE VII	MISCELLANEOUS PROVISIONS	15

Section 7.01.	Basic Agreement Ratified	15
Section 7.02.	GOVERNING LAW	15
Section 7.03.	Execution in Counterparts	15
Section 7.04.	Intention of Parties	15


Exhibit A	-	Form of Certificate
Exhibit B	-	DTC Letter of Representations

THIS TRUST SUPPLEMENT NO. 2007-1B, dated as of June 26, 2007 (herein called the “Trust Supplement”), between United Air Lines, Inc., a Delaware corporation (the “Company”), and Wilmington Trust Company (the “Trustee”), to the Pass Through Trust Agreement, dated as of June 26, 2007, between the Company and the Trustee (the “Basic Agreement”).

W I T N E S S E T H:

WHEREAS, the Company intends to finance certain Aircraft through separate secured loan transactions, under which the Company will own such Aircraft (collectively, the “Aircraft”);

WHEREAS, in the case of each Aircraft, the Company will issue pursuant to an Indenture, on a recourse basis, Equipment Notes secured by such Aircraft;

WHEREAS, the Trustee hereby declares the creation of the United Air Lines Pass Through Trust 2007-1B (the “Applicable Trust”) for the benefit of the Applicable Certificateholders, and the initial Applicable Certificateholders as the grantors of the Applicable Trust, by their respective acceptances of the Applicable Certificates, join in the creation of the Applicable Trust with the Trustee;

WHEREAS, this Trust Supplement is subject to the provisions of the Trust Indenture Act of 1939, as amended, and shall, to the extent applicable, be governed by such provisions;

[Trust Supplement No. 2007-1B]

NOW THEREFORE, in consideration of the premises herein, it is agreed between the Company and the Trustee as follows:

ARTICLE I

THE CERTIFICATES

Section 1.01. The Certificates. There is hereby created a series of Certificates to be issued under the Agreement to be distinguished and known as “United Air Lines Pass Through Certificates, Series 2007-1B” (hereinafter defined as the “Applicable Certificates”). Each Applicable Certificate represents a fractional undivided interest in the Applicable Trust created hereby. The Applicable Certificates shall be the only instruments evidencing a fractional undivided interest in the Applicable Trust.

The terms and conditions applicable to the Applicable Certificates are as follows:

(c) The Special Distribution Dates with respect to the Applicable Certificates means any Business Day on which a Special Payment is to be distributed pursuant to the Agreement.

(e) The Applicable Certificates are subject to the Intercreditor Agreement.

[Trust Supplement No. 2007-1B]

(f) The Applicable Certificates are entitled to the benefits of the Liquidity Facility.

(g) The Equipment Notes to be acquired and held in the Applicable Trust, and the related Aircraft and Note Documents, are described in the Note Purchase Agreement.

(h) The Cut-off Date is July 4, 2007.

ARTICLE II

DEFINITIONS

Agreement: Has the meaning specified in the recitals hereto.

Applicable Certificate: Has the meaning specified in Section 1.01 of this Trust Supplement.

Applicable Certificateholder: Means the Person in whose name an Applicable Certificate is registered on the Register for the Applicable Certificates.

Applicable Trust: Has the meaning specified in the recitals hereto.

Basic Agreement: Has the meaning specified in the first paragraph of this Trust Supplement.

Certificate: Has the meaning specified in the Intercreditor Agreement.

[Trust Supplement No. 2007-1B]

Class: Has the meaning specified in the Intercreditor Agreement.

Company: Has the meaning specified in the first paragraph of this Trust Supplement.

Controlling Party: Has the meaning specified in the Intercreditor Agreement.

Distribution Date: Means any Regular Distribution Date or Special Distribution Date as the context requires.

Final Maturity Date: Means January 2, 2021.

Intercreditor Agreement: Means the Intercreditor Agreement dated as of June 26, 2007 among the Trustee, the Other Trustees, the Liquidity Provider, the liquidity provider relating to the Class A Certificates and Wilmington Trust Company, as Subordination Agent and as trustee thereunder, as amended, supplemented or otherwise modified from time to time in accordance with its terms.

Investors: Means the Underwriters, together with all subsequent beneficial owners of the Applicable Certificates.

[Trust Supplement No. 2007-1B]

Other Agreements: Means (i) the Basic Agreement as supplemented by Trust Supplement No. 2007-1A dated as of the date hereof relating to United Air Lines Pass Through Trust 2007-1A, (ii) the Basic Agreement as supplemented by Trust Supplement No. 2007-1C dated as of the date hereof relating to United Air Lines Pass Through Trust 2007-1C, (iii) the Basic Agreement as supplemented by a Trust Supplement relating to any Additional Trust and (iv) the Basic Agreement as supplemented by a Trust Supplement relating to any Refinancing Trust.

Other Trustees: Means the trustees under the Other Agreements, and any successor or other trustee appointed as provided therein.

Other Trusts: Means the United Air Lines Pass Through Trust 2007-1A, the United Air Lines Pass Through Trust 2007-1C, an Additional Trust or Trusts, if any, and a Refinancing Trust or Trusts, if any, created by the Other Agreements.

Prospectus Supplement: Means the final Prospectus Supplement dated June 19, 2007 relating to the offering of the Applicable Certificates, the Class A and the Class C Certificates.

QIB: Means a qualified institutional buyer as defined in Rule 144A.

Ratings Confirmation: Has the meaning specified in the Intercreditor Agreement.

Register: Has the meaning specified in Section 5.03 of this Trust Supplement.

Registrar: Has the meaning specified in Section 5.03 of this Trust Supplement.

Restrictive Legend: Has the meaning specified in Section 5.01 of this Trust Supplement.

Rule 144A: Means Rule 144A under the Securities Act and any successor rule thereto.

Scheduled Payment: Means, with respect to any Equipment Note, (i) any payment of principal or interest on such Equipment Note (other than any such payment which is not in fact received by the Trustee or any Subordination Agent within ten (10) Business Days of the date on which such payment is scheduled to be made) or (ii) any payment of interest on the Applicable Certificates with funds drawn under the Liquidity Facility, which payment in any such case represents the installment of principal on such Equipment Note at the stated maturity of such installment, the payment of regularly scheduled interest accrued on the unpaid principal amount of such Equipment Note, or both; provided, however, that any payment of principal, premium, if any, Break Amount, if any, or interest resulting from the redemption or purchase of any Equipment Note shall not constitute a Scheduled Payment.

Securities Act: Means the United States Securities Act of 1933, as amended from time to time, or any successor thereto.

Special Payment: Means any payment (other than a Scheduled Payment) in respect of, or any proceeds of, any Equipment Note or Collateral (as defined in each Indenture).

[Trust Supplement No. 2007-1B]

Triggering Event: Has the meaning assigned to such term in the Intercreditor Agreement.

Trust Supplement: Has the meaning specified in the first paragraph of this trust supplement.

Trustee: Has the meaning specified in the first paragraph of this Trust Supplement.

Underwriters: Means, collectively, Morgan Stanley & Co. Incorporated and Credit Suisse Securities (USA) LLC.

United Bankruptcy Event: Has the meaning specified in the Intercreditor Agreement.

ARTICLE III

DEFAULT

Section 3.01. Purchase Rights of Certificateholders. (a) At any time after the occurrence and during the continuation of a Certificate Buyout Event, each Applicable Certificateholder (other than the Company or any of its Affiliates) shall have the right to purchase, for the purchase price set forth in the Class A Trust Agreement, all, but not less than all, of the Class A Certificates upon 15 days’ written notice to the Class A Trustee and each other Applicable Certificateholder, on the third Business Day next following the expiry of such 15-day notice period, provided that (A) if prior to the end of such 15 day period any other Applicable Certificateholder (other than the Company or any of its Affiliates) notifies such purchasing Applicable Certificateholder that such other Applicable Certificateholder wants to participate in such purchase, then such other Applicable Certificateholder (other than the Company or any of its Affiliates) may join with the purchasing Applicable Certificateholder to purchase all, but not less than all, of the Class A Certificates pro rata based on the Fractional Undivided Interest in the Applicable Trust held by each such Applicable Certificateholder and (B) if prior to the end of such 15 day period any other Applicable Certificateholder fails to notify the purchasing Applicable Certificateholder of such other Applicable Certificateholder’s desire to participate in such a purchase, then such other Applicable Certificateholder shall lose its right to purchase the Class A Certificates pursuant to this Section 3.01(a).

[Trust Supplement No. 2007-1B]

(b) By acceptance of its Applicable Certificate, each Applicable Certificateholder agrees that at any time after the occurrence and during the continuation of a Certificate Buyout Event:

(i) each Class C Certificateholder (other than the Company or any of its Affiliates) shall have the right (which shall not expire upon any purchase of the Class A Certificates pursuant to clause (a) above) to purchase all, but not less than all, of the Applicable Certificates and the Class A Certificates upon 15 days’ written notice to the Trustee, the Class A Trustee and each other Class C Certificateholder, on the third Business Day next following the expiry of such 15-day notice period, provided that (A) if prior to the end of such 15 day period any other Class C Certificateholder (other than the Company or any of its Affiliates) notifies such purchasing Class C Certificateholder that such other Class C Certificateholder wants to participate in such purchase, then such other Class C Certificateholder (other than the Company or any of its Affiliates) may join with the purchasing Class C Certificateholder to purchase all, but not less than all, of the Applicable Certificates and the Class A Certificates pro rata based on the Fractional Undivided Interest in the Class C Trust held by each such Class C Certificateholder and (B) if prior to the end of such 15 day period any other Class C Certificateholder fails to notify the purchasing Class C Certificateholder of such other Class C Certificateholder’s desire to participate in such a purchase, then such other Class C Certificateholder shall lose its right to purchase the Applicable Certificates and the Class A Certificates pursuant to this Section 3.01(b)(i);

(ii) if any Additional Certificates are issued pursuant to one or more Additional Trusts, each Additional Certificateholder (other than the Company or any of its Affiliates), shall have the right (which shall not expire upon any purchase of the Applicable Certificates pursuant to clauses (a) or (b)(i) above) to purchase all, but not less than all, of the Applicable Certificates, the Class A Certificates, the Class C Certificates and any Additional Certificates ranked senior to the Additional Certificates held by the purchasing Additional Certificateholders upon 15 days’ written notice to the Trustee, the Class A Trustee, the Class C Trustee, any Additional Trustee with respect to Additional Certificates that rank senior to the Additional Certificates held by the purchasing Additional Certificateholders and each other Additional Certificateholder of the same Class, on the third Business Day next following the expiry of such 15-day notice period, provided that (A) if prior to the end of such 15 day period any other Additional Certificateholder of such Class (other than the Company or any of its Affiliates) notifies such purchasing Additional Certificateholder that such other Additional Certificateholder wants to participate in such purchase, then such other Additional Certificateholder (other than the Company or any of its Affiliates) may join with the purchasing Additional Certificateholder to purchase all, but not less than all, of the Applicable Certificates, the Class A Certificates, the Class C Certificates and such senior Additional Certificates pro rata based on the Fractional Undivided Interest in the applicable Additional Trust held by each such Additional Certificateholder and (B) if prior to the end of such 15 day period any other Additional Certificateholder of such

[Trust Supplement No. 2007-1B]

Class fails to notify the purchasing Additional Certificateholder of such other Additional Certificateholder’s desire to participate in such a purchase, then such other Additional Certificateholder shall lose its right to purchase the Applicable Certificates, the Class A Certificates, the Class C Certificates and such senior Additional Certificates pursuant to this Section 3.01(b)(ii).

(iii) if any Refinancing Certificates are issued, each Refinancing Certificateholder shall have the same right (subject to the same terms and conditions) to purchase Certificates pursuant to this Section 3.01(b) (and to receive notice in connection therewith) as the Certificateholders of the Class that such Refinancing Certificates refinanced.

The purchase price with respect to the Applicable Certificates shall be equal to the Pool Balance of the Applicable Certificates, together with accrued and unpaid interest thereon to the date of such purchase, without premium or Break Amount, but including any other amounts then due and payable to the Applicable Certificateholders under the Agreement, the Intercreditor Agreement or any Note Document or on or in respect of the Applicable Certificates; provided, however, that no such purchase of Applicable Certificates shall be effective unless the purchaser(s) shall certify to the Trustee that contemporaneously with such purchase, such purchaser(s) is (are) purchasing, pursuant to the terms of the Agreement and the Other Agreements, (A) in the case of any purchase of the Applicable Certificates pursuant to clause (i) above, all of the Applicable Certificates and the Class A Certificates, or (B) in all other cases, the Applicable Certificates, the Class A Certificates, the Class C Certificates and, if applicable, the Additional Certificates that are senior to the securities held by such purchaser(s). Each payment of the purchase price of the Applicable Certificates referred to in the first sentence hereof shall be made to an account or accounts designated by the Trustee and each such purchase shall be subject to the terms of this Section 3.01. Each Applicable Certificateholder agrees by its acceptance of its Applicable Certificate that (at any time after the occurrence of a Certificate Buyout Event) it will, upon payment from such Class C Certificateholder(s), Additional Certificateholder(s) or Refinancing Certificateholders, as the case may be, of the purchase price set forth in the first sentence of this paragraph, (i) forthwith sell, assign, transfer and convey to the purchaser(s) thereof (without recourse, representation or warranty of any kind except for its own acts), all of the right, title, interest and obligation of such Applicable Certificateholder in the Agreement, the Intercreditor Agreement, the Liquidity Facility, the Note Purchase Agreement, the Note Documents and all Applicable Certificates held by such Applicable Certificateholder (excluding all right, title and interest under any of the foregoing to the extent such right, title or interest is with respect to an obligation not then due and payable as respects any action or inaction or state of affairs occurring prior to such sale) (and the purchaser shall assume all of such Applicable Certificateholder’s obligations under the Agreement, the Intercreditor Agreement, the Liquidity Facility, the Note Purchase Agreement, the Note Documents and all such Applicable Certificates), (ii) if such purchase occurs after a Record Date relating to any distribution and prior to or on the related Distribution Date, forthwith turn over to the purchaser(s) of its Applicable Certificate all amounts, if any, received by it on account of such distribution. The Applicable Certificates will be deemed to be purchased on the date payment of the purchase price is made notwithstanding the failure of the Applicable Certificateholders to deliver any Applicable Certificates and, upon such a purchase, (I) the only rights of the Applicable Certificateholders will be to deliver the Applicable Certificates to the purchaser(s)

[Trust Supplement No. 2007-1B]

and receive the purchase price for such Applicable Certificates and (II) if the purchaser(s) shall so request, such Applicable Certificateholder will comply with all the provisions of Section 3.04 of the Basic Agreement to enable new Applicable Certificates to be issued to the purchaser in such denominations as it shall request. All charges and expenses in connection with the issuance of any such new Applicable Certificates shall be borne by the purchaser thereof.

As used in this Section 3.01 and elsewhere in this Trust Supplement, the terms “Additional Certificate”, “Additional Certificateholder”, “Additional Equipment Notes”, “Additional Trust”, “Additional Trust Agreement”, “Additional Trustee”, “Class A Certificate”, “Class A Certificateholder”, “Class A Trust”, “Class A Trust Agreement”, “Class A Trustee”, “Class C Certificate”, “Class C Certificateholder”, “Class C Trust”, “Class C Trust Agreement”, “Class C Trustee”, “Refinancing Certificates”, “Refinancing Certificateholder”, “Refinancing Equipment Notes” and “Refinancing Trust” shall have the respective meanings assigned to such terms in the Intercreditor Agreement.

(c) This Section 3.01 supersedes and replaces Section 6.01(b) of the Basic Agreement, with respect to the Applicable Trust.

ARTICLE IV

THE TRUSTEE

[Trust Supplement No. 2007-1B]

Section 4.03. Representations and Warranties of the Trustee. The Trustee hereby represents and warrants that:

(a) the Trustee has full power, authority and legal right to execute, deliver and perform this Trust Supplement, the Intercreditor Agreement, the Note Purchase Agreement and the Note Documents to which it is or is to become a party and has taken all necessary action to authorize the execution, delivery and performance by it of this Trust Supplement, the Intercreditor Agreement, the Note Purchase Agreement and the Note Documents to which it is or is to become a party;

[Trust Supplement No. 2007-1B]

Section 4.04. Trustee Liens. The Trustee in its individual capacity agrees, in addition to the agreements contained in Section 7.17 of the Basic Agreement, that it will at its own cost and expense promptly take any action as may be necessary to duly discharge and satisfy in full any Trustee’s Liens on or with respect to the Trust Property which is attributable to the Trustee in its individual capacity and which is unrelated to the transactions contemplated by the Intercreditor Agreement or the Note Purchase Agreement.

Section 4.05. Trustee Reports. Promptly following any early redemption or purchase of, or any default in the payment of principal or interest in respect of, any of the Equipment Notes held in the Applicable Trust, the Trustee shall furnish to Applicable Certificateholders of record on such date a statement setting forth (x) the expected Pool Balances for each subsequent Regular Distribution Date, (y) the related Pool Factors for such Regular Distribution Dates and (z) the expected principal distribution schedule of the Equipment Notes, in the aggregate, held as Trust Property of such Applicable Trust at the date of such notice. With respect to the Applicable Certificates registered in the name of a Clearing Agency or its nominee, on any date on which the Trustee is required to a statement as provided above, the Trustee will request that such Clearing Agency post on its Internet bulletin board a securities position listing setting forth the names of all Clearing Agency Participants reflected on such Clearing Agency’s books as holding interests in the Applicable Certificates on such date. The Trustee will mail to each such Clearing Agency Participant the statement described above and will make available additional copies as requested by such Clearing Agency Participant for forwarding to holders of interests in the Applicable Certificates.

ARTICLE V

TRANSFER OF THE APPLICABLE CERTIFICATES

Section 5.01. Restrictive Legends. All Applicable Certificates issued pursuant to the Agreement shall bear a legend to the following effect (the “Restrictive Legend”):

THIS CERTIFICATE IS SUBJECT TO TRANSFER RESTRICTIONS. BY ITS ACQUISITION HEREOF, THE HOLDER (1) REPRESENTS THAT IT IS A “QUALIFIED INSTITUTIONAL BUYER” (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT); (2) AGREES THAT IT WILL NOT RESELL OR OTHERWISE TRANSFER THIS CERTIFICATE EXCEPT TO A “QUALIFIED INSTITUTIONAL BUYER” (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT); AND (3) AGREES THAT IF IT SHOULD RESELL OR OTHERWISE TRANSFER THIS CERTIFICATE IT WILL DELIVER TO EACH PERSON TO WHOM THIS CERTIFICATE IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND. IN CONNECTION WITH ANY TRANSFER OF THIS CERTIFICATE, THE TRANSFEREE MUST COMPLETE THE FORM ON THE REVERSE HEREOF RELATING TO THE MANNER OF SUCH TRANSFER AND SUBMIT SUCH FORM TO THE TRUSTEE. TRUST SUPPLEMENT NO. 2007-1B TO THE PASS THROUGH TRUST AGREEMENT CONTAINS A PROVISION REQUIRING THE REGISTRAR TO REFUSE TO REGISTER ANY TRANSFER OF THIS CERTIFICATE IN VIOLATION OF THE FOREGOING RESTRICTIONS.

[Trust Supplement No. 2007-1B]

Section 5.02. Amendment of Section 3.04 of the Basic Agreement. Sections 5.03 and 5.04 of this Trust Supplement supersede and replace Section 3.04 of the Basic Agreement, with respect to the Applicable Trust.

Section 5.03. Transfer and Exchange. The Trustee shall cause to be kept at the office or agency to be maintained by it in accordance with the provisions of Section 7.12 of the Basic Agreement a register (the “Register”) of the Applicable Certificates in which, subject to such reasonable regulations as it may prescribe, the Trustee shall provide for the registration of such Applicable Certificates and of transfers and exchanges of such Applicable Certificates as herein provided. The Trustee shall initially be the registrar (the “Registrar”) for the purpose of registering such Applicable Certificates and transfers and exchanges of such Applicable Certificates as herein provided.

All Applicable Certificates issued upon any registration of transfer or exchange of Applicable Certificates shall be valid obligations of the Applicable Trust, evidencing the same interest therein, and entitled to the same benefits under this Agreement, as the Applicable Certificates surrendered upon such registration of transfer or exchange.

Upon surrender for registration of transfer of any Applicable Certificate at the Corporate Trust Office or such other office or agency with the form of transfer notice thereon duly completed and executed, and otherwise complying with the terms of this Agreement, including providing evidence of compliance with any restrictions on transfer, in form satisfactory to the Trustee and the Registrar, the Trustee shall execute, authenticate and deliver, in the name of the designated transferee or transferees, one or more new Applicable Certificates of like series, in authorized denominations of a like aggregate Fractional Undivided Interest. Whenever any Applicable Certificates are so surrendered for exchange, the Trustee shall execute, authenticate and deliver the Applicable Certificates that the Applicable Certificateholder making the exchange is entitled to receive. Every Applicable Certificate presented or surrendered for registration of transfer or exchange shall be duly endorsed or accompanied by a written instrument of transfer in form satisfactory to the Trustee and the Registrar duly executed by the Applicable Certificateholder thereof or its attorney duly authorized in writing.

The Registrar shall not register the transfer or exchange of any Applicable Certificate in the name of any Person unless and until evidence satisfactory to the Company and the Trustee that the conditions to any such transfer or exchange set forth in Section 5.04 shall have been satisfied is submitted to them. Such conditions shall be deemed satisfied with respect to a transfer if the transferor and transferee duly execute and deliver to the Trustee the transfer notice in the form attached to the Applicable Certificate, unless the Company or the Trustee has a reasonable basis for requesting additional evidence.

[Trust Supplement No. 2007-1B]

Trustee shall require payment of a sum sufficient to cover any tax or governmental charge that may be imposed in connection with any transfer or exchange of Applicable Certificates. All Applicable Certificates surrendered for registration of transfer or exchange shall be canceled and subsequently destroyed by the Trustee.

Section 5.04. Special Transfer Provisions.

(a) Transfers Limited to QIBs. If an Applicable Certificate is to be transferred, the Registrar shall register the transfer only if such transfer is being made to a proposed transferee who has provided the transfer notice attached to the form of Applicable Certificate stating that it is purchasing the Applicable Certificate for its own account or an account with respect to which it exercises sole investment discretion and that it and any such account is a QIB within the meaning of Rule 144A.

(b) Restrictive Legend. Upon the transfer, exchange or replacement of Applicable Certificates, the Registrar shall deliver only Applicable Certificates that bear the Restrictive Legend.

(c) General. By acceptance of any Applicable Certificate, each Holder of such an Applicable Certificate will be deemed to:

(i) Represent that it is accepting such Applicable Certificate for its own account or an account with respect to which it exercises sole investment discretion and that it and any such account is a QIB;

(ii) Agree that any sale or other transfer by it of any Applicable Certificate will only be made to a QIB;

(iii) Agree that it will, and each subsequent transferee will be required to, deliver to each person to whom it transfers Applicable Certificates notice of these restrictions on transfer of the Applicable Certificates;

(iv) Agree that no registration of the transfer of an Applicable Certificate will be made unless the transferee completes and submits to the Trustee the form included on the reverse of the Applicable Certificate in which it states that it is purchasing the Applicable Certificate for its own account or an account with respect to which it exercises sole investment discretion and that it and any such account is a QIB;

(v) Understand that the Applicable Certificates will bear a legend substantially to the effect of the Restrictive Legend;

(vi) Acknowledge that the Company, the Trustee, the Underwriters, and others will rely on the truth and accuracy of the foregoing acknowledgments, representations, warranties and agreements and agree that, if any of the acknowledgments, representations, warranties and agreements deemed to have been made by its purchase of the Applicable Certificates is no longer accurate, it shall promptly notify the Company, the Trustee and the Underwriters. If it is acquiring any Applicable Certificates as a fiduciary or agent of one or more investor accounts, it

[Trust Supplement No. 2007-1B]

represents that it has sole investment discretion with respect to each such investor account and that it has full power to make the foregoing acknowledgments, representations and agreements on behalf of each such investor account;

(vii) Acknowledge that the foregoing restrictions apply to holders of beneficial interests in the Applicable Certificates as well as to registered holders of Applicable Certificates; and

(viii) Acknowledge that the Trustee will not be required to accept for registration of transfer any Applicable Certificate unless evidence satisfactory to the Company and the Trustee that the restrictions on transfer set forth herein have been complied with is submitted to them.

Until such time as no Applicable Certificates remain Outstanding, the Registrar shall retain copies of all letters, notices and other written communications received pursuant to this Section 5.04. The Trustee, if not the Registrar at such time, shall have the right to inspect and make copies of all such letters, notices or other written communications at any reasonable time upon the giving of reasonable written notice to the Registrar.

ARTICLE VI

ADDITIONAL AMENDMENT; SUPPLEMENTAL AGREEMENTS

Section 6.01. Supplemental Agreements Without Consent of Applicable Certificateholders. Without limitation of Section 9.01 of the Basic Agreement, under the terms of, and subject to the limitations contained in, Section 9.01 of the Basic Agreement, the Company may (but will not be required to), and the Trustee (subject to Section 9.03 of the Basic Agreement) shall, at the Company’s request, at any time and from time to time, (i) enter into one or more agreements supplemental to the Agreement, the Intercreditor Agreement or the Note Purchase Agreement to provide for the formation of one or more Additional Trusts, the issuance of Additional Certificates, the purchase by any Additional Trust of applicable Additional Equipment Notes and other matters incidental thereto or otherwise contemplated by Section 2.01(b) of the Basic Agreement, subject to the provisions of Section 4(a)(i) of the Note Purchase Agreement and Section 9.1 of the Intercreditor Agreement, and (ii) enter into one or more agreements supplemental to the Agreement to provide for the formation of one or more Refinancing Trusts, the issuance of Refinancing Certificates, the purchase by any Refinancing Trust of applicable Refinancing Equipment Notes and other matters incidental thereto or as otherwise contemplated by Section 2.01(b) of the Basic Agreement, subject to the provisions of Section 4(a)(i) of the Note Purchase Agreement and Section 9.1(c) of the Intercreditor Agreement.

Section 6.02. Consent of Holders of Certificates Issued under other Trusts. Notwithstanding any provision in Section 6.01 of this Trust Supplement to the contrary, no amendment or modification of Section 3.01 of this Trust Supplement shall be effective unless the trustee for each Class of Certificates affected by such amendment or modification shall have consented thereto.

[Trust Supplement No. 2007-1B]

ARTICLE VII

MISCELLANEOUS PROVISIONS

Section 7.01. Basic Agreement Ratified. Except and so far as herein expressly provided, all of the provisions, terms and conditions of the Basic Agreement are in all respects ratified and confirmed; and the Basic Agreement and this Trust Supplement shall be taken, read and construed as one and the same instrument. All replacements of provisions of, and other modifications of the Basic Agreement set forth in this Trust Supplement are solely with respect to the Applicable Trust.

Section 7.02. GOVERNING LAW. THIS AGREEMENT SHALL IN ALL RESPECTS BE GOVERNED BY THE LAW OF THE STATE OF NEW YORK, INCLUDING ALL MATTERS OF CONSTRUCTION, VALIDITY AND PERFORMANCE. THIS AGREEMENT IS BEING DELIVERED IN THE STATE OF NEW YORK.

Section 7.03. Execution in Counterparts. This Trust Supplement may be executed in any number of counterparts, each of which shall be an original, but such counterparts shall together constitute but one and the same instrument.

Section 7.04. Intention of Parties. The parties hereto intend that the Applicable Trust be classified for U.S. federal income tax purposes as a grantor trust under Subpart E, Part I of Subchapter J of the Internal Revenue Code of 1986, as amended, and not as a trust or association taxable as a corporation or as a partnership. Each Applicable Certificateholder and Investor, by its acceptance of its Applicable Certificate or a beneficial interest therein, agrees to treat the Applicable Trust as a grantor trust for all U.S. federal, state and local income tax purposes. The powers granted and obligations undertaken pursuant to the Agreement shall be so construed so as to further such intent.

[Trust Supplement No. 2007-1B]


UNITED AIR LINES, INC.

By:		/s / Stephen Lieberman
Name:		Stephen Lieberman
Title:		Vice President and Treasurer

WILMINGTON TRUST COMPANY, as Trustee

By:		/s/ W. Chris Sponenberg
Name:		W. Chris Sponenberg
Title:		Vice President

[Trust Supplement No. 2007-1B]

EXHIBIT A

FORM OF CERTIFICATE

Certificate

No.

*	This legend to appear on Book-Entry Certificates to be deposited with the Depository Trust Company.

EXHIBIT A

Page 1

[Trust Supplement No. 2007-1B]

UNITED AIR LINES PASS THROUGH TRUST 2007-1B

United Air Lines Pass Through Certificate, Series 2007-1B

Issuance Date: June 26, 2007

Final Maturity Date: January 2, 2021

Evidencing A Fractional Undivided Interest In The United Air Lines Pass

Through Trust 2007-1B, The Property Of Which Shall Include Certain Equipment

Notes Each Secured By An Aircraft Owned By United Air Lines, Inc.

$[ ] Fractional Undivided Interest

representing [0.000xxxxxxx%] of the Trust per $1,000 face amount

THIS CERTIFIES THAT , for value received, is the registered owner of a $ ( DOLLARS) Fractional Undivided Interest in the United Air Lines Pass Through Trust 2007-1B (the “Trust”) created by Wilmington Trust Company, as trustee (the “Trustee”), pursuant to a Pass Through Trust Agreement, dated as of June 26, 2007 (the “Basic Agreement”), between the Trustee and United Air Lines, Inc., a Delaware corporation (the “Company”), as supplemented by Trust Supplement No. 2007-1B thereto, dated as of June 26, 2007 (the “Trust Supplement” and, together with the Basic Agreement, the “Agreement”), between the Trustee and the Company, a summary of certain of the pertinent provisions of which is set forth below. To the extent not otherwise defined herein, the capitalized terms used herein have the meanings assigned to them in the Agreement. This Certificate is one of the duly authorized Certificates designated as “United Air Lines Pass Through Certificates, Series 2007-1B” (herein called the “Certificates”). This Certificate is issued under and is subject to the terms, provisions and conditions of the Agreement. By virtue of its acceptance hereof, the holder of this Certificate (the “Certificateholder” and, together with all other holders of Certificates issued by the Trust, the “Certificateholders”) assents to and agrees to be bound by the provisions of the Agreement and the Intercreditor Agreement. The property of the Trust includes certain Equipment Notes, the Parent Guarantee with respect to such Equipment Notes and all rights of the Trust to receive payments under the Intercreditor Agreement and the Liquidity Facility (the “Trust Property”). Each issue of the Equipment Notes is secured by, among other things, a security interest in an Aircraft owned by the Company.

EXHIBIT A

Page 2

[Trust Supplement No. 2007-1B]

Trustee, equal to the product of the percentage interest in the Trust evidenced by this Certificate and an amount equal to the sum of such Scheduled Payments. Subject to and in accordance with the terms of the Agreement and the Intercreditor Agreement, in the event that Special Payments on the Equipment Notes are received by the Trustee, from funds then available to the Trustee, there shall be distributed on the applicable Special Distribution Date, to the Person in whose name this Certificate is registered at the close of business on the 15th day preceding the Special Distribution Date, an amount in respect of such Special Payments on the Equipment Notes, the receipt of which has been confirmed by the Trustee, equal to the product of the percentage interest in the Trust evidenced by this Certificate and an amount equal to the sum of such Special Payments so received. If a Regular Distribution Date or Special Distribution Date is not a Business Day, distribution shall be made on the immediately following Business Day with the same force and effect as if made on such Regular Distribution Date or Special Distribution Date and interest shall accrue during the intervening period. The Trustee shall mail notice of each Special Payment and the Special Distribution Date therefor to the Certificateholder of this Certificate.

EXHIBIT A

Page 3

[Trust Supplement No. 2007-1B]

transfer hereof or in exchange hereof or in lieu hereof whether or not notation of such consent is made upon this Certificate. The Agreement also permits the amendment thereof, in certain limited circumstances, without the consent of the Certificateholders of any of the Certificates.

The Certificates are issuable only as registered Certificates without coupons in minimum denominations of $1,000 Fractional Undivided Interest and integral multiples thereof, except that one Certificate may be issued in a different denomination. As provided in the Agreement and subject to certain limitations therein set forth, the Certificates are exchangeable for new Certificates of authorized denominations evidencing the same aggregate Fractional Undivided Interest in the Trust, as requested by the Certificateholder surrendering the same.

EXHIBIT A

Page 4

[Trust Supplement No. 2007-1B]

By acceptance of this Certificate, each Certificateholder will be deemed to:

(i) Represent that it is accepting this Certificate for its own account or an account with respect to which it exercises sole investment discretion and that it and any such account is a QIB;

(ii) Agree that any sale or other transfer by it of this Certificate will only be made to a QIB;

(iii) Agree that it will deliver to each person to whom it transfers this Certificate notice of these restrictions on transfer of this Certificate;

(iv) Agree that no registration of the transfer of a Certificate will be made unless the transferee completes and submits to the Trustee the form included on the reverse of this Certificate in which it states that it is purchasing this Certificate for its own account or an account with respect to which it exercises sole investment discretion and that it and any such account is a QIB;

(v) Understand that this Certificate will bear a legend substantially to the effect of the Restrictive Legend;

(vi) Acknowledge that the Company, the Trustee, the Underwriters, and others will rely on the truth and accuracy of the foregoing acknowledgments, representations, warranties and agreements and agree that, if any of the acknowledgments, representations, warranties and agreements deemed to have been made by its purchase of this Certificate is no longer accurate, it shall promptly notify the Company, the Trustee and the Underwriters. If it is acquiring this Certificate as a fiduciary or agent of one or more investor accounts, it represents that it has sole investment discretion with respect to each such investor account and that it has full power to make the foregoing acknowledgments, representations and agreements on behalf of each such investor account;

(vii) Acknowledge that the foregoing restrictions apply to holders of beneficial interests in this Certificate as well as to registered holders of this Certificate; and

(viii) Acknowledge that the Trustee will not be required to accept for registration of transfer this Certificate unless evidence satisfactory to the Company and the Trustee that the restrictions on transfer set forth herein have been complied with is submitted to them.

EXHIBIT A

Page 5

[Trust Supplement No. 2007-1B]

IN WITNESS WHEREOF, the Trustee has caused this Certificate to be duly executed.


UNITED AIR LINES PASS THROUGH TRUST 2007-1B

By:		WILMINGTON TRUST COMPANY, as Trustee

By:
Name:
Title:

EXHIBIT A

Page 6

[Trust Supplement No. 2007-1B]

FORM OF THE TRUSTEE’S CERTIFICATE OF AUTHENTICATION

This is one of the Certificates referred to in the within-mentioned Agreement.


WILMINGTON TRUST COMPANY, as Trustee

By:
Name:
Title:

EXHIBIT A

Page 7

[Trust Supplement No. 2007-1B]

TRANSFER NOTICE

FORM OF TRANSFER NOTICE

FOR VALUE RECEIVED the undersigned registered holder hereby sell(s), assign(s) and transfer(s) unto


Insert Taxpayer Identification No.





please print or typewrite name and address including zip code of assignee



the within Certificate and all rights thereunder, hereby irrevocably constituting and appointing



attorney to transfer said Certificate on the books of the Registrar with full power of substitution in the premises.

In connection with any transfer of this Certificate, the undersigned confirms:

The Registrar shall not be obligated to register this Certificate in the name of any Person other than the Holder hereof unless and until the conditions to any such transfer of registration set forth herein and in Section 5.03 of the Trust Supplement shall have been satisfied.


Date: [ , ]		[Name of Transferor]

		NOTE: The signature must correspond with the name as written upon the face of the within-mentioned instrument in every particular, without alteration or any change whatsoever.

Signature Guarantee:

TO BE COMPLETED BY PURCHASER

The undersigned represents and warrants that it is purchasing this Certificate for its own account or an account with respect to which it exercises sole investment discretion and that it and any such account is a “qualified institutional buyer” within the meaning of Rule 144A under the Securities Act of 1933, as amended.

EXHIBIT A

Page 8

[Trust Supplement No. 2007-1B]

In addition, the undersigned has reviewed this Certificate and makes the representations, agreements, understandings and acknowledgments deemed made by a Person acquiring or accepting this Certificate as set forth therein.


Date: [ ]
				NOTE: To be executed by an executive officer.

EXHIBIT A

Page 9

[Trust Supplement No. 2007-1B]

EXHIBIT B

[DTC Letter of Representations]

EXHIBIT B

Page 1

Trust Supplement No. 2007-1C, dated as of June 26, 2007

Exhibit 4.7

TRUST SUPPLEMENT NO. 2007-1C

dated as of June 26, 2007

between

WILMINGTON TRUST COMPANY

as Trustee,

and

UNITED AIR LINES, INC.

PASS THROUGH TRUST AGREEMENT

dated as of June 26, 2007

$101,736,000

United Air Lines Pass Through Trust 2007-1C

United Air Lines

Pass Through Certificates,

Series 2007-1C

Vedder, Price, Kaufman & Kammholz, P.C.

Chicago, Illinois

TABLE OF CONTENTS


		Page

ARTICLE I	THE CERTIFICATES	2

Section 1.01.	The Certificates	2

ARTICLE II	DEFINITIONS	3

Section 2.01.	Definitions	3

ARTICLE III	DEFAULT	6

Section 3.01.	Purchase Rights of Certificateholders	6

ARTICLE IV	THE TRUSTEE	8

Section 4.01.	Delivery of Documents; Delivery Dates	8
Section 4.02.	The Trustee	9
Section 4.03.	Representations and Warranties of the Trustee	9
Section 4.04.	Trustee Liens	10
Section 4.05.	Trustee Reports	10

ARTICLE V	TRANSFER OF THE APPLICABLE CERTIFICATES	11

Section 5.01.	Restrictive Legends	11
Section 5.02.	Amendment of Section 3.04 of the Basic Agreement	11
Section 5.03.	Transfer and Exchange	11
Section 5.04.	Special Transfer Provisions	12

ARTICLE VI	ADDITIONAL AMENDMENT; SUPPLEMENTAL AGREEMENTS	13

Section 6.01.	Supplemental Agreements Without Consent of Applicable Certificateholders	13
Section 6.02.	Consent of Holders of Certificates Issued under other Trusts	14

ARTICLE VII	MISCELLANEOUS PROVISIONS	14

Section 7.01.	Basic Agreement Ratified	14
Section 7.02.	GOVERNING LAW	14
Section 7.03.	Execution in Counterparts	14
Section 7.04.	Intention of Parties	14


Exhibit A	-	Form of Certificate
Exhibit B	-	DTC Letter of Representations

THIS TRUST SUPPLEMENT NO. 2007-1C, dated as of June 26, 2007 (herein called the “Trust Supplement”), between United Air Lines, Inc., a Delaware corporation (the “Company”), and Wilmington Trust Company (the “Trustee”), to the Pass Through Trust Agreement, dated as of June 26, 2007, between the Company and the Trustee (the “Basic Agreement”).

WITNESSETH:

WHEREAS, the Company intends to finance certain Aircraft through separate secured loan transactions, under which the Company will own such Aircraft (collectively, the “Aircraft”);

WHEREAS, in the case of each Aircraft, the Company will issue pursuant to an Indenture, on a recourse basis, Equipment Notes secured by such Aircraft;

WHEREAS, the Trustee hereby declares the creation of the United Air Lines Pass Through Trust 2007-1C (the “Applicable Trust”) for the benefit of the Applicable Certificateholders, and the initial Applicable Certificateholders as the grantors of the Applicable Trust, by their respective acceptances of the Applicable Certificates, join in the creation of the Applicable Trust with the Trustee;

WHEREAS, this Trust Supplement is subject to the provisions of the Trust Indenture Act of 1939, as amended, and shall, to the extent applicable, be governed by such provisions;

[Trust Supplement No. 2007-1C]

NOW THEREFORE, in consideration of the premises herein, it is agreed between the Company and the Trustee as follows:

ARTICLE I

THE CERTIFICATES

Section 1.01. The Certificates. There is hereby created a series of Certificates to be issued under the Agreement to be distinguished and known as “United Air Lines Pass Through Certificates, Series 2007-1C” (hereinafter defined as the “Applicable Certificates”). Each Applicable Certificate represents a fractional undivided interest in the Applicable Trust created hereby. The Applicable Certificates shall be the only instruments evidencing a fractional undivided interest in the Applicable Trust.

The terms and conditions applicable to the Applicable Certificates are as follows:

(c) The Special Distribution Dates with respect to the Applicable Certificates means any Business Day on which a Special Payment is to be distributed pursuant to the Agreement.

(e) The Applicable Certificates are subject to the Intercreditor Agreement.

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(f) The Equipment Notes to be acquired and held in the Applicable Trust, and the related Aircraft and Note Documents, are described in the Note Purchase Agreement.

(g) The Cut-off Date is July 4, 2007.

ARTICLE II

DEFINITIONS

Section 2.01. Definitions. For all purposes of the Basic Agreement as supplemented by this Trust Supplement, the following capitalized terms have the following meanings (any capitalized term used herein but not defined shall have the meaning assigned to it in the Basic Agreement, and any term used herein which is defined in both this Trust Supplement and the Basic Agreement shall have the meaning assigned thereto in this Trust Supplement for purposes of the Basic Agreement as supplemented by this Trust Supplement):

Agreement: Has the meaning specified in the recitals hereto.

Applicable Certificate: Has the meaning specified in Section 1.01 of this Trust Supplement.

Applicable Certificateholder: Means the Person in whose name an Applicable Certificate is registered on the Register for the Applicable Certificates.

Applicable Trust: Has the meaning specified in the recitals hereto.

Basic Agreement: Has the meaning specified in the first paragraph of this Trust Supplement.

Certificate: Has the meaning specified in the Intercreditor Agreement.

Certificate Buyout Event: Means that a United Bankruptcy Event has occurred and is continuing and the following events in either clause (A) or (B) have occurred: (A) (i) the 60-day period specified in Section 1110(a)(2)(A) of the U.S. Bankruptcy Code (the “60-Day Period”) has expired and (ii) United has not entered into one or more agreements under Section 1110(a)(2)(A) of the U.S. Bankruptcy Code to perform all of its obligations under all of the Indentures or, if it has entered into such agreements, has at any time thereafter failed to cure any default under any of the Indentures in accordance with Section 1110(a)(2)(B) of the Bankruptcy Code; or (B) if prior to the expiry of the 60-Day Period, United shall have abandoned any Aircraft.

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Class: Has the meaning specified in the Intercreditor Agreement.

Company: Has the meaning specified in the first paragraph of this Trust Supplement.

Controlling Party: Has the meaning specified in the Intercreditor Agreement.

Distribution Date: Means any Regular Distribution Date or Special Distribution Date as the context requires.

Final Maturity Date: Means July 2, 2014.

Intercreditor Agreement: Means the Intercreditor Agreement dated as of June 26, 2007 among the Trustee, the Other Trustees, the Liquidity Provider and Wilmington Trust Company, as Subordination Agent and as trustee thereunder, as amended, supplemented or otherwise modified from time to time in accordance with its terms.

Investors: Means the Underwriters, together with all subsequent beneficial owners of the Applicable Certificates.

Liquidity Provider: Means, initially, Morgan Stanley Senior Funding, Inc., a corporation duly established under the laws of the State of Delaware, as liquidity provider under the Class A Liquidity Facility and Class B Liquidity Facility (as such terms are defined in the Intercreditor Agreement) and any replacements or successors therefor appointed in accordance with the Intercreditor Agreement.

Other Agreements: Means (i) the Basic Agreement as supplemented by Trust Supplement No. 2007-1A dated as of the date hereof relating to United Air Lines Pass Through Trust 2007-1A, (ii) the Basic Agreement as supplemented by Trust Supplement No. 2007-1B dated as of the date hereof relating to United Air Lines Pass Through Trust 2007-1B, (iii) the Basic Agreement as supplemented by a Trust Supplement relating to any Additional Trust and (iv) the Basic Agreement as supplemented by a Trust Supplement relating to any Refinancing Trust.

Other Trustees: Means the trustees under the Other Agreements, and any successor or other trustee appointed as provided therein.

[Trust Supplement No. 2007-1C]

Other Trusts: Means the United Air Lines Pass Through Trust 2007-1A, the United Air Lines Pass Through Trust 2007-1B, an Additional Trust or Trusts, if any, and a Refinancing Trust or Trusts, if any, created by the Other Agreements.

Prospectus Supplement: Means the final Prospectus Supplement dated June 19, 2007 relating to the offering of the Applicable Certificates, the Class A and the Class B Certificates.

QIB: Means a qualified institutional buyer as defined in Rule 144A.

Ratings Confirmation: Has the meaning specified in the Intercreditor Agreement.

Register: Has the meaning specified in Section 5.03 of this Trust Supplement.

Registrar: Has the meaning specified in Section 5.03 of this Trust Supplement.

Restrictive Legend: Has the meaning specified in Section 5.01 of this Trust Supplement.

Rule 144A: Means Rule 144A under the Securities Act and any successor rule thereto.

Scheduled Payment: Means, with respect to any Equipment Note, any payment of principal or interest on such Equipment Note (other than any such payment which is not in fact received by the Trustee or any Subordination Agent within ten (10) Business Days of the date on which such payment is scheduled to be made), which payment represents the installment of principal on such Equipment Note at the stated maturity of such installment, the payment of regularly scheduled interest accrued on the unpaid principal amount of such Equipment Note, or both; provided, however, that any payment of principal, premium, if any, Break Amount, if any, or interest resulting from the redemption or purchase of any Equipment Note shall not constitute a Scheduled Payment.

Securities Act: Means the United States Securities Act of 1933, as amended from time to time, or any successor thereto.

Special Payment: Means any payment (other than a Scheduled Payment) in respect of, or any proceeds of, any Equipment Note or Collateral (as defined in each Indenture).

Triggering Event: Has the meaning assigned to such term in the Intercreditor Agreement.

Trust Property: Means (i) subject to the Intercreditor Agreement, the Equipment Notes held as the property of the Applicable Trust, the Parent Guarantee with respect to such Equipment Notes, all monies at any time paid thereon and all monies due and to become due thereunder, (ii) funds from time to time deposited in the Certificate Account and the Special Payments Account and, subject to the Intercreditor Agreement, any proceeds from the sale by the Trustee pursuant to Article VI of the Basic Agreement of any Equipment Note and (iii) all rights of the Applicable Trust and the Trustee, on behalf of the Applicable Trust, under the Intercreditor Agreement and the Note Purchase Agreement, including, without limitation, all rights to receive certain payments thereunder, and all monies paid to the Trustee on behalf of the Applicable Trust pursuant to the Intercreditor Agreement.

[Trust Supplement No. 2007-1C]

Trust Supplement: Has the meaning specified in the first paragraph of this trust supplement.

Trustee: Has the meaning specified in the first paragraph of this Trust Supplement.

Underwriters: Means, collectively, Morgan Stanley & Co. Incorporated and Credit Suisse Securities (USA) LLC.

United Bankruptcy Event: Has the meaning specified in the Intercreditor Agreement.

ARTICLE III

DEFAULT

Section 3.01. Purchase Rights of Certificateholders. (a) At any time after the occurrence and during the continuation of a Certificate Buyout Event, each Applicable Certificateholder (other than the Company or any of its Affiliates) shall have the right (which shall not expire upon any purchase of the Class A Certificates pursuant to the Class B Trust Agreement) to purchase, for the purchase prices set forth in the Class A Trust Agreement and the Class B Trust Agreement, respectively, all, but not less than all, of the Class A Certificates and the Class B Certificates upon 15 days’ written notice to the Class A Trustee, the Class B Trustee and each other Applicable Certificateholder, on the third Business Day next following the expiry of such 15-day notice period, provided that (A) if prior to the end of such 15 day period any other Applicable Certificateholder (other than the Company or any of its Affiliates) notifies such purchasing Applicable Certificateholder that such other Applicable Certificateholder wants to participate in such purchase, then such other Applicable Certificateholder (other than the Company or any of its Affiliates) may join with the purchasing Applicable Certificateholder to purchase all, but not less than all, of the Class A Certificates and the Class B Certificates pro rata based on the Fractional Undivided Interest in the Applicable Trust held by each such Applicable Certificateholder and (B) if prior to the end of such 15 day period any other Applicable Certificateholder fails to notify the purchasing Applicable Certificateholder of such other Applicable Certificateholder’s desire to participate in such a purchase, then such other Applicable Certificateholder shall lose its right to purchase the Class A Certificates and the Class B Certificates pursuant to this Section 3.01(a);

(b) By acceptance of its Applicable Certificate, each Applicable Certificateholder agrees that at any time after the occurrence and during the continuation of a Certificate Buyout Event:

(i) if any Additional Certificates are issued pursuant to one or more Additional Trusts, each Additional Certificateholder (other than the Company or any of

[Trust Supplement No. 2007-1C]

its Affiliates), shall have the right (which shall not expire upon any purchase of the Class A Certificates pursuant to the Class B Trust Agreement or any purchase of the Class A Certificates and Class B Certificates pursuant to clause (a) above) to purchase all, but not less than all, of the Applicable Certificates, the Class A Certificates, the Class B Certificates and any Additional Certificates ranked senior to the Additional Certificates held by the purchasing Additional Certificateholders upon 15 days’ written notice to the Trustee, the Class A Trustee, the Class B Trustee, any Additional Trustee with respect to Additional Certificates that rank senior to the Additional Certificates held by the purchasing Additional Certificateholders and each other Additional Certificateholder of the same Class, on the third Business Day next following the expiry of such 15-day notice period, provided that (A) if prior to the end of such 15 day period any other Additional Certificateholder of such Class (other than the Company or any of its Affiliates) notifies such purchasing Additional Certificateholder that such other Additional Certificateholder wants to participate in such purchase, then such other Additional Certificateholder (other than the Company or any of its Affiliates) may join with the purchasing Additional Certificateholder to purchase all, but not less than all, of the Applicable Certificates, the Class A Certificates, the Class B Certificates and such senior Additional Certificates pro rata based on the Fractional Undivided Interest in the applicable Additional Trust held by each such Additional Certificateholder and (B) if prior to the end of such 15 day period any other Additional Certificateholder of such Class fails to notify the purchasing Additional Certificateholder of such other Additional Certificateholder’s desire to participate in such a purchase, then such other Additional Certificateholder shall lose its right to purchase the Applicable Certificates, the Class A Certificates, the Class B Certificates and such senior Additional Certificates pursuant to this Section 3.01(b)(ii).

(ii) if any Refinancing Certificates are issued, each Refinancing Certificateholder shall have the same right (subject to the same terms and conditions) to purchase Certificates pursuant to Section 3.01(a) (and to receive notice in connection therewith) as the Certificateholders of the Class that such Refinancing Certificates refinanced.

[Trust Supplement No. 2007-1C]

Certificateholder(s) or Refinancing Certificateholders, as the case may be, of the purchase price set forth in the first sentence of this paragraph, (i) forthwith sell, assign, transfer and convey to the purchaser(s) thereof (without recourse, representation or warranty of any kind except for its own acts), all of the right, title, interest and obligation of such Applicable Certificateholder in the Agreement, the Intercreditor Agreement, the Note Purchase Agreement, the Note Documents and all Applicable Certificates held by such Applicable Certificateholder (excluding all right, title and interest under any of the foregoing to the extent such right, title or interest is with respect to an obligation not then due and payable as respects any action or inaction or state of affairs occurring prior to such sale) (and the purchaser shall assume all of such Applicable Certificateholder’s obligations under the Agreement, the Intercreditor Agreement, the Note Purchase Agreement, the Note Documents and all such Applicable Certificates), (ii) if such purchase occurs after a Record Date relating to any distribution and prior to or on the related Distribution Date, forthwith turn over to the purchaser(s) of its Applicable Certificate all amounts, if any, received by it on account of such distribution. The Applicable Certificates will be deemed to be purchased on the date payment of the purchase price is made notwithstanding the failure of the Applicable Certificateholders to deliver any Applicable Certificates and, upon such a purchase, (I) the only rights of the Applicable Certificateholders will be to deliver the Applicable Certificates to the purchaser(s) and receive the purchase price for such Applicable Certificates and (II) if the purchaser(s) shall so request, such Applicable Certificateholder will comply with all the provisions of Section 3.04 of the Basic Agreement to enable new Applicable Certificates to be issued to the purchaser in such denominations as it shall request. All charges and expenses in connection with the issuance of any such new Applicable Certificates shall be borne by the purchaser thereof.

As used in this Section 3.01 and elsewhere in this Trust Supplement, the terms “Additional Certificate”, “Additional Certificateholder”, “Additional Equipment Notes”, “Additional Trust”, “Additional Trust Agreement”, “Additional Trustee”, “Class A Certificate”, “Class A Certificateholder”, “Class A Trust”, “Class A Trust Agreement”, “Class A Trustee”, “Class B Certificate”, “Class B Certificateholder”, “Class B Trust”, “Class B Trust Agreement”, “Class B Trustee”, “Refinancing Certificates”, “Refinancing Certificateholder”, “Refinancing Equipment Notes” and “Refinancing Trust” shall have the respective meanings assigned to such terms in the Intercreditor Agreement.

(c) This Section 3.01 supersedes and replaces Section 6.01(b) of the Basic Agreement, with respect to the Applicable Trust.

ARTICLE IV

THE TRUSTEE

Section 4.01. Delivery of Documents; Delivery Dates. The Trustee is hereby directed (i) to execute and deliver the Intercreditor Agreement and the Note Purchase Agreement on or prior to the Issuance Date, each in the form delivered to the Trustee by the Company, and (ii) subject to the respective terms thereof, to perform its obligations thereunder. Upon request of the Company and the satisfaction or waiver of the closing conditions specified in the Underwriting Agreement, the Trustee shall execute, deliver, authenticate, issue and sell Applicable Certificates in authorized denominations equaling in the aggregate the amount set

[Trust Supplement No. 2007-1C]

forth, with respect to the Applicable Trust, in Schedule I to the Underwriting Agreement evidencing the entire ownership interest in the Applicable Trust, which amount equals the maximum aggregate principal amount of Equipment Notes which may be purchased by the Trustee pursuant to the Note Purchase Agreement. Except as provided in Sections 3.03 and 3.06 of the Basic Agreement, the Trustee shall not execute, authenticate or deliver Applicable Certificates in excess of the aggregate amount specified in this paragraph. The provisions of this Section 4.01 supersede and replace the first sentence of Section 4.02(a) of the Basic Agreement, with respect to the Applicable Trust.

Section 4.02. The Trustee. (a) Subject to Section 4.03 of this Trust Supplement and Section 7.15 of the Basic Agreement, the Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Trust Supplement or the Note Purchase Agreement or the due execution hereof or thereof by the Company or the other parties thereto (other than the Trustee), or for or in respect of the recitals and statements contained herein or therein, all of which recitals and statements are made solely by the Company, except that the Trustee hereby represents and warrants that each of this Trust Supplement, the Basic Agreement, each Applicable Certificate, the Intercreditor Agreement and the Note Purchase Agreement has been executed and delivered by one of its officers who is duly authorized to execute and deliver such document on its behalf.

Section 4.03. Representations and Warranties of the Trustee. The Trustee hereby represents and warrants that:

[Trust Supplement No. 2007-1C]

to which it is a party, which violation, default or lien could reasonably be expected to have an adverse effect on the Trustee’s performance or ability to perform its duties hereunder or thereunder or on the transactions contemplated herein or therein;

[Trust Supplement No. 2007-1C]

ARTICLE V

TRANSFER OF THE APPLICABLE CERTIFICATES

Section 5.01. Restrictive Legends. All Applicable Certificates issued pursuant to the Agreement shall bear a legend to the following effect (the “Restrictive Legend”):

THIS CERTIFICATE IS SUBJECT TO TRANSFER RESTRICTIONS. BY ITS ACQUISITION HEREOF, THE HOLDER (1) REPRESENTS THAT IT IS A “QUALIFIED INSTITUTIONAL BUYER” (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT); (2) AGREES THAT IT WILL NOT RESELL OR OTHERWISE TRANSFER THIS CERTIFICATE EXCEPT TO A “QUALIFIED INSTITUTIONAL BUYER” (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT); AND (3) AGREES THAT IF IT SHOULD RESELL OR OTHERWISE TRANSFER THIS CERTIFICATE IT WILL DELIVER TO EACH PERSON TO WHOM THIS CERTIFICATE IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND. IN CONNECTION WITH ANY TRANSFER OF THIS CERTIFICATE, THE TRANSFEREE MUST COMPLETE THE FORM ON THE REVERSE HEREOF RELATING TO THE MANNER OF SUCH TRANSFER AND SUBMIT SUCH FORM TO THE TRUSTEE. TRUST SUPPLEMENT NO. 2007-1C TO THE PASS THROUGH TRUST AGREEMENT CONTAINS A PROVISION REQUIRING THE REGISTRAR TO REFUSE TO REGISTER ANY TRANSFER OF THIS CERTIFICATE IN VIOLATION OF THE FOREGOING RESTRICTIONS.

[Trust Supplement No. 2007-1C]

authorized denominations of a like aggregate Fractional Undivided Interest. Whenever any Applicable Certificates are so surrendered for exchange, the Trustee shall execute, authenticate and deliver the Applicable Certificates that the Applicable Certificateholder making the exchange is entitled to receive. Every Applicable Certificate presented or surrendered for registration of transfer or exchange shall be duly endorsed or accompanied by a written instrument of transfer in form satisfactory to the Trustee and the Registrar duly executed by the Applicable Certificateholder thereof or its attorney duly authorized in writing.

To permit registrations of transfers and exchanges in accordance with the terms, conditions and restrictions hereof, the Trustee shall execute and authenticate Applicable Certificates at the Registrar’s request. No service charge shall be made to an Applicable Certificateholder for any registration of transfer or exchange of Applicable Certificates, but the Trustee shall require payment of a sum sufficient to cover any tax or governmental charge that may be imposed in connection with any transfer or exchange of Applicable Certificates. All Applicable Certificates surrendered for registration of transfer or exchange shall be canceled and subsequently destroyed by the Trustee.

Section 5.04. Special Transfer Provisions.

(b) Restrictive Legend. Upon the transfer, exchange or replacement of Applicable Certificates, the Registrar shall deliver only Applicable Certificates that bear the Restrictive Legend.

(c) General. By acceptance of any Applicable Certificate, each Holder of such an Applicable Certificate will be deemed to:

(ii) Agree that any sale or other transfer by it of any Applicable Certificate will only be made to a QIB;

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(v) Understand that the Applicable Certificates will bear a legend substantially to the effect of the Restrictive Legend;

(vii) Acknowledge that the foregoing restrictions apply to holders of beneficial interests in the Applicable Certificates as well as to registered holders of Applicable Certificates; and

ARTICLE VI

ADDITIONAL AMENDMENT; SUPPLEMENTAL AGREEMENTS

[Trust Supplement No. 2007-1C]

or more agreements supplemental to the Agreement, the Intercreditor Agreement or the Note Purchase Agreement to provide for the formation of one or more Additional Trusts, the issuance of Additional Certificates, the purchase by any Additional Trust of applicable Additional Equipment Notes and other matters incidental thereto or otherwise contemplated by Section 2.01(b) of the Basic Agreement, subject to the provisions of Section 4(a)(i) of the Note Purchase Agreement and Section 9.1 of the Intercreditor Agreement, and (ii) enter into one or more agreements supplemental to the Agreement to provide for the formation of one or more Refinancing Trusts, the issuance of Refinancing Certificates, the purchase by any Refinancing Trust of applicable Refinancing Equipment Notes and other matters incidental thereto or as otherwise contemplated by Section 2.01(b) of the Basic Agreement, subject to the provisions of Section 4(a)(i) of the Note Purchase Agreement and Section 9.1(c) of the Intercreditor Agreement.

ARTICLE VII

MISCELLANEOUS PROVISIONS

Section 7.02. GOVERNING LAW. THIS AGREEMENT SHALL IN ALL RESPECTS BE GOVERNED BY THE LAW OF THE STATE OF NEW YORK, INCLUDING ALL MATTERS OF CONSTRUCTION, VALIDITY AND PERFORMANCE. THIS AGREEMENT IS BEING DELIVERED IN THE STATE OF NEW YORK.

[Trust Supplement No. 2007-1C]


UNITED AIR LINES, INC.

By:		/s/ Stephen Lieberman
Name:		Stephen Lieberman
Title:		Vice President and Treasurer

WILMINGTON TRUST COMPANY, as Trustee

By:		/s/ W. Chris Sponenberg
Name:		W. Chris Sponenberg
Title:		Vice President

[Trust Supplement No. 2007-1C]

EXHIBIT A

FORM OF CERTIFICATE

Certificate No.

THIS CERTIFICATE IS SUBJECT TO TRANSFER RESTRICTIONS. BY ITS ACQUISITION HEREOF, THE HOLDER (1) REPRESENTS THAT IT IS A “QUALIFIED INSTITUTIONAL BUYER” (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT); (2) AGREES THAT IT WILL NOT RESELL OR OTHERWISE TRANSFER THIS CERTIFICATE EXCEPT TO A “QUALIFIED INSTITUTIONAL BUYER” (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT); AND (3) AGREES THAT IF IT SHOULD RESELL OR OTHERWISE TRANSFER THIS CERTIFICATE IT WILL DELIVER TO EACH PERSON TO WHOM THIS CERTIFICATE IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND. IN CONNECTION WITH ANY TRANSFER OF THIS CERTIFICATE, THE TRANSFEREE MUST COMPLETE THE FORM ON THE REVERSE HEREOF RELATING TO THE MANNER OF SUCH TRANSFER AND SUBMIT SUCH FORM TO THE TRUSTEE. TRUST SUPPLEMENT NO. 2007-1C TO THE PASS THROUGH TRUST AGREEMENT CONTAINS A PROVISION REQUIRING THE REGISTRAR TO REFUSE TO REGISTER ANY TRANSFER OF THIS CERTIFICATE IN VIOLATION OF THE FOREGOING RESTRICTIONS.

*	This legend to appear on Book-Entry Certificates to be deposited with the Depository Trust Company.

EXHIBIT A

Page 1

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UNITED AIR LINES PASS THROUGH TRUST 2007-1C

United Air Lines Pass Through Certificate, Series 2007-1C

Issuance Date: June 26, 2007

Final Maturity Date: July 2, 2014

Evidencing A Fractional Undivided Interest In The United Air Lines Pass

Through Trust 2007-1C, The Property Of Which Shall Include Certain Equipment

Notes Each Secured By An Aircraft Owned By United Air Lines, Inc.

$[ ] Fractional Undivided Interest

representing [0.000xxxxxxx%] of the Trust per $1,000 face amount

THIS CERTIFIES THAT , for value received, is the registered owner of a $ ( DOLLARS) Fractional Undivided Interest in the United Air Lines Pass Through Trust 2007-1C (the “Trust”) created by Wilmington Trust Company, as trustee (the “Trustee”), pursuant to a Pass Through Trust Agreement, dated as of June 26, 2007 (the “Basic Agreement”), between the Trustee and United Air Lines, Inc., a Delaware corporation (the “Company”), as supplemented by Trust Supplement No. 2007-1C thereto, dated as of June 26, 2007 (the “Trust Supplement” and, together with the Basic Agreement, the “Agreement”), between the Trustee and the Company, a summary of certain of the pertinent provisions of which is set forth below. To the extent not otherwise defined herein, the capitalized terms used herein have the meanings assigned to them in the Agreement. This Certificate is one of the duly authorized Certificates designated as “United Air Lines Pass Through Certificates, Series 2007-1C” (herein called the “Certificates”). This Certificate is issued under and is subject to the terms, provisions and conditions of the Agreement. By virtue of its acceptance hereof, the holder of this Certificate (the “Certificateholder” and, together with all other holders of Certificates issued by the Trust, the “Certificateholders”) assents to and agrees to be bound by the provisions of the Agreement and the Intercreditor Agreement. The property of the Trust includes certain Equipment Notes, the Parent Guarantee with respect to such Equipment Notes and all rights of the Trust to receive payments under the Intercreditor Agreement (the “Trust Property”). Each issue of the Equipment Notes is secured by, among other things, a security interest in an Aircraft owned by the Company.

EXHIBIT A

Page 2

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EXHIBIT A

Page 3

[Trust Supplement No. 2007-1C]

EXHIBIT A

Page 4

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ERISA and the Code pursuant to one or more prohibited transaction statutory or administrative exemptions.

By acceptance of this Certificate, each Certificateholder will be deemed to:

(i) Represent that it is accepting this Certificate for its own account or an account with respect to which it exercises sole investment discretion and that it and any such account is a QIB;

(ii) Agree that any sale or other transfer by it of this Certificate will only be made to a QIB;

(iii) Agree that it will deliver to each person to whom it transfers this Certificate notice of these restrictions on transfer of this Certificate;

(v) Understand that this Certificate will bear a legend substantially to the effect of the Restrictive Legend;

(vi) Acknowledge that the Company, the Trustee, the Underwriters, and others will rely on the truth and accuracy of the foregoing acknowledgments, representations, warranties and agreements and agree that, if any of the acknowledgments, representations, warranties and agreements deemed to have been made by its purchase of this Certificate is no longer accurate, it shall promptly notify the Company, the Trustee and the Underwriters. If it is acquiring this Certificate as a fiduciary or agent of one or more investor accounts, it represents that it has sole investment discretion with respect to each such investor account and that it has full power to make the foregoing acknowledgments, representations and agreements on behalf of each such investor account;

(vii) Acknowledge that the foregoing restrictions apply to holders of beneficial interests in this Certificate as well as to registered holders of this Certificate; and

EXHIBIT A

Page 5

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IN WITNESS WHEREOF, the Trustee has caused this Certificate to be duly executed.


UNITED AIR LINES PASS THROUGH TRUST 2007-1C

By:		WILMINGTON TRUST COMPANY, as Trustee

By:
Name:
Title:

EXHIBIT A

Page 6

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FORM OF THE TRUSTEE’S CERTIFICATE OF AUTHENTICATION

This is one of the Certificates referred to in the within-mentioned Agreement.


WILMINGTON TRUST COMPANY, as Trustee

By:
Name:
Title:

EXHIBIT A

Page 7

[Trust Supplement No. 2007-1C]

TRANSFER NOTICE

FORM OF TRANSFER NOTICE

FOR VALUE RECEIVED the undersigned registered holder hereby sell(s), assign(s) and transfer(s) unto

Insert Taxpayer Identification No.

please print or typewrite name and address including zip code of assignee

the within Certificate and all rights thereunder, hereby irrevocably constituting and appointing

attorney to transfer said Certificate on the books of the Registrar with full power of substitution in the premises.

In connection with any transfer of this Certificate, the undersigned confirms:


Date: [ , ]		[Name of Transferor]

		NOTE: The signature must correspond with the name as written upon the face of the within-mentioned instrument in every particular, without alteration or any change whatsoever.

Signature Guarantee:

TO BE COMPLETED BY PURCHASER

EXHIBIT A

Page 8

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Date: [ ]
						NOTE: To be executed by an executive officer.]

EXHIBIT A

Page 9

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EXHIBIT B

[DTC Letter of Representations]

EXHIBIT B

Page 1

Revolving Credit Agreement (2007-1A), dated as of June 26, 2007

Exhibit 4.8

REVOLVING CREDIT AGREEMENT

(2007-1A)

dated as of June 26, 2007

between

WILMINGTON TRUST COMPANY,

as Subordination Agent,

as Agent and Trustee for the

United Air Lines Pass Through Trust 2007-1A,

as Borrower

and

MORGAN STANLEY SENIOR FUNDING, INC.,

as Liquidity Provider

Relating to United Air Lines

Pass Through Trust 2007-1A

United Air Lines Pass Through Certificates, Series 2007-1A

TABLE OF CONTENTS


		Page
ARTICLE I	DEFINITIONS	1

Section 1.01 Certain Defined Terms		1

ARTICLE II	AMOUNT AND TERMS OF THE COMMITMENT	7

Section 2.01 The Advances		7
Section 2.02 Making the Advances		7
Section 2.03 Fees		9
Section 2.04 Automatic Reductions and Termination of the Maximum Commitment		9
Section 2.05 Repayments of Interest Advances , the Special Termination Advance or the Final Advance		10
Section 2.06 Repayments of Provider Advances		10
Section 2.07 Payments to the Liquidity Provider Under the Intercreditor Agreement		11
Section 2.08 Book Entries		12
Section 2.09 Payments from Available Funds Only		12
Section 2.10 Extension of the Expiry Date; Non-Extension Advance		12

ARTICLE III	OBLIGATIONS OF THE BORROWER	12

Section 3.01 Increased Costs		12
Section 3.02 Capital Adequacy		13
Section 3.03 Payments Free of Deductions		14
Section 3.04 Payments		15
Section 3.05 Computations		15
Section 3.06 Payment on Non-Business Days		15
Section 3.07 Interest		16
Section 3.08 Replacement of Borrower		17
Section 3.09 Funding Loss Indemnification		17
Section 3.10 Illegality		17

ARTICLE IV	CONDITIONS PRECEDENT	18

Section 4.01 Conditions Precedent to Effectiveness of Section 2.01		18
Section 4.02 Conditions Precedent to Borrowing		19

TABLE OF CONTENTS

(continued)


		Page
ARTICLE V	COVENANTS	19

Section 5.01 Affirmative Covenants of the Borrower		19
Section 5.02 Negative Covenants of the Borrower		20

ARTICLE VI	LIQUIDITY EVENTS OF DEFAULT AND SPECIAL TERMINATION	20

Section 6.01 Liquidity Events of Default and Special Termination		20

ARTICLE VII	MISCELLANEOUS	21

Section 7.01 Amendments, Etc		21
Section 7.02 Notices, Etc		21
Section 7.03 No Waiver; Remedies		22
Section 7.04 Further Assurances		22
Section 7.05 Indemnification; Survival of Certain Provisions		22
Section 7.06 Liability of the Liquidity Provider		23
Section 7.07 Costs, Expenses and Taxes		23
Section 7.08 Binding Effect; Participations		24
Section 7.09 Severability		25
Section 7.10 GOVERNING LAW		25
Section 7.11 Submission to Jurisdiction; Waiver of Jury Trial; Waiver of Immunity		25
Section 7.12 Execution in Counterparts		26
Section 7.13 Entirety		26
Section 7.14 Headings		26
Section 7.15 LIQUIDITY PROVIDER’S OBLIGATION TO MAKE ADVANCES		26


Annex I	-	Interest Advance Notice of Borrowing
Annex II	-	Non-Extension Advance Notice of Borrowing
Annex III	-	Downgrade Advance Notice of Borrowing
Annex IV	-	Final Advance Notice of Borrowing
Annex V	-	Notice of Termination
Annex VI	-	Notice of Replacement Subordination Agent
Annex VII	-	Special Termination Advance Notice of Borrowing
Annex VIII	-	Notice of Special Termination

REVOLVING CREDIT AGREEMENT (2007-1A)

THIS REVOLVING CREDIT AGREEMENT (2007-1A) dated as of June 26, 2007 (this “Agreement”), between WILMINGTON TRUST COMPANY, a Delaware banking corporation, not in its individual capacity but solely as Subordination Agent under the Intercreditor Agreement (each as defined below), as agent and trustee for the Class A Trust (as defined below) (the “Borrower”), and MORGAN STANLEY SENIOR FUNDING, INC., a Delaware corporation (the “Liquidity Provider”).

W I T N E S S E T H:

WHEREAS, pursuant to the Class A Trust Agreement (such term and all other capitalized terms used in these recitals having the meanings set forth or referred to in Section 1.01), the Class A Trust is issuing the Class A Certificates;

WHEREAS, the Borrower, in order to support the timely payment of a portion of the interest on the Class A Certificates in accordance with their terms, has requested the Liquidity Provider to enter into this Agreement, providing in part for the Borrower to request in specified circumstances that Advances be made hereunder; and

WHEREAS, Morgan Stanley, a Delaware corporation (the “Guarantor”), will guarantee in full, pursuant to a guarantee agreement dated as of the date hereof and issued by the Guarantor (the “Guarantee Agreement”), the payment obligations of the Liquidity Provider under this Agreement.

NOW, THEREFORE, in consideration of the premises, the parties hereto agree as follows:

ARTICLE I

DEFINITIONS

Section 1.01 Certain Defined Terms. (a) Definitions. As used in this Agreement and unless otherwise expressly indicated, or unless the context clearly requires otherwise, the following capitalized terms shall have the following respective meanings for all purposes of this Agreement:

“Additional Costs” has the meaning assigned to such term in Section 3.01.

“Advance” means an Interest Advance, a Final Advance, a Provider Advance, a Special Termination Advance, an Applied Special Termination Advance or an Applied Provider Advance, as the case may be.

“Applicable Liquidity Rate” has the meaning assigned to such term in Section 3.07(g).

“Applicable Margin” means (x) with respect to any Unpaid Advance (other than an Unapplied Special Termination Advance) or Applied Provider Advance, 1.75% per annum, or (y) with respect to any Unapplied Provider Advance, the rate per annum specified in the Fee Letter, or (z) with respect to any Unapplied Special Termination Advance, the margin per annum specified in the Fee Letter.

[Revolving Credit Agreement (2007-1A)]

“Applied Downgrade Advance” has the meaning assigned to such term in Section 2.06(a).

“Applied Non-Extension Advance” has the meaning assigned to such term in Section 2.06(a).

“Applied Provider Advance” has the meaning assigned to such term in Section 2.06(a).

“Applied Special Termination Advance” has the meaning assigned to such term in Section 2.05.

“Base Rate” means, for a day, a fluctuating interest rate per annum in effect from time to time, which rate per annum shall at all times be equal to (a) the weighted average of the rates on overnight Federal funds transactions with members of the Federal Reserve System arranged by Federal funds brokers, as published for such day (or, if such day is not a Business Day, for the preceding Business Day) by the Federal Reserve Bank of New York, or if such rate is not so published for any day that is a Business Day, the average of the quotations for such day for such transactions received by the Liquidity Provider from three Federal funds brokers of recognized standing selected by it, plus (b) one-quarter of one percent (¹/4 of 1%).

“Base Rate Advance” means an Advance that bears interest at a rate based upon the Base Rate.

“Borrower” has the meaning assigned to such term in the recital of parties to this Agreement.

“Borrowing” means the making of Advances requested by delivery of a Notice of Borrowing.

“Business Day” means any day other than a Saturday or Sunday or a day on which commercial banks are required or authorized to close in Chicago, Illinois, New York, New York or, so long as any Class A Certificate is outstanding, the city and state in which the Class A Trustee, the Borrower or any Loan Trustee maintains its corporate trust office or receives or disburses funds, and, if the applicable Business Day relates to any Advance or other amount bearing interest based on the LIBOR Rate, on which dealings in dollars are carried on in the London interbank market.

“Code” means the Internal Revenue Code of 1986, as amended.

“Downgrade Advance” means an Advance made pursuant to Section 2.02(c).

“Downgrade Event” means a downgrading of the Guarantor’s short-term unsecured debt rating or short-term issuer credit rating (as applicable) issued by either Rating Agency below the applicable Threshold Rating or the Guarantee ceases to be in full force and effect or becomes invalid or unenforceable or the Guarantor repudiates its liability thereunder, unless each Rating

[Revolving Credit Agreement (2007-1A)]

Agency shall have confirmed in writing on or prior to the date of such downgrading that such downgrading will not result in the downgrading, withdrawal or suspension of the ratings of the Class A Certificates, in which case such downgrading of the Guarantor’s short-term unsecured debt rating or short-term issuer credit rating (as applicable) shall not constitute a Downgrade Event.

“Effective Date” has the meaning assigned to such term in Section 4.01. The delivery of the certificate of the Liquidity Provider contemplated by Section 4.01(e) shall be conclusive evidence that the Effective Date has occurred.

“Excluded Taxes” means (i) Taxes imposed on, based on, or measured by the overall net income, capital, franchises or receipts (other than Taxes which are or are in the nature of sales or use Taxes or value added Taxes) of the Liquidity Provider or of its Lending Office by the jurisdiction where such Liquidity Provider’s principal office or such Lending Office is located or any other taxing jurisdiction in which such Tax is imposed as a result of the Liquidity Provider being, or having been, organized in, or conducting, or having conducted, any activities unrelated to the transactions contemplated by the Operative Agreements in such jurisdiction, and (ii) Excluded Withholding Taxes.

“Excluded Withholding Taxes” means (i) withholding Taxes imposed by the United States except (but only in the case of a successor Liquidity Provider organized under the laws of a jurisdiction outside the United States) to the extent that such United States withholding Taxes are imposed or increased as a result of any change in applicable law (excluding from change in applicable law for this purpose a change in an applicable treaty or other change in law affecting the applicability of a treaty) after the date hereof, or in the case of a successor Liquidity Provider (including a transferee of an Advance), after the date on which such successor Liquidity Provider obtains its interest, (ii) any withholding Taxes imposed by the United States which are imposed or increased as a result of the Liquidity Provider failing to deliver to the Borrower any certificate or document (which certificate or document in the good faith judgment of the Liquidity Provider it is legally entitled to provide) which is reasonably requested by the Borrower to establish that payments under this Agreement are exempt from (or entitled to a reduced rate of) withholding Tax, and (iii) withholding Taxes imposed by the United States on payments to a recipient in any other jurisdiction to which such Lending Office is moved if, under the laws in effect at the time of such move, such laws would require greater withholding of Taxes on payments to such Liquidity Provider acting from an office in such jurisdiction than would be required on payments to such Liquidity Provider acting from an office in the jurisdiction from which such Lending Office was moved.

“Expenses” means liabilities, obligations, damages, settlements, penalties, claims, actions, suits, costs, expenses, and disbursements (including, without limitation, reasonable fees and disbursements of legal counsel and costs of investigation), provided that Expenses shall not include any Taxes.

“Expiry Date” means the anniversary date of the Closing Date immediately following the date the Liquidity Provider has provided written notice to the Borrower by the Notice Date of the Liquidity Provider’s desire not to extend beyond such anniversary date its obligation to make Advances.

[Revolving Credit Agreement (2007-1A)]

“Final Advance” means an Advance made pursuant to Section 2.02(d).

“GAAP” means generally accepted accounting principles as set forth in the statements of financial accounting standards issued by the Financial Accounting Standards Board of the American Institute of Certified Public Accountants, as such principles may at any time or from time to time be varied by any applicable financial accounting rules or regulations issued by the Securities and Exchange Commission and, with respect to any person, shall mean such principles applied on a basis consistent with prior periods except as may be disclosed in such person’s financial statements.

“Guarantee Agreement” has the meaning assigned to such term in the recitals to this Agreement.

“Guarantor” has the meaning assigned to such term in the recitals to this Agreement.

“Indemnified Tax” has the meaning assigned to such term in Section 3.03(a).

“Intercreditor Agreement” means the Intercreditor Agreement dated as of the date hereof among the Trustees, the Liquidity Provider, the liquidity provider under the other Liquidity Facility and the Subordination Agent, as the same may be amended, supplemented or otherwise modified from time to time in accordance with its terms.

“Interest Advance” means an Advance made pursuant to Section 2.02(a).

“Interest Period” means, with respect to any LIBOR Advance, each of the following periods:

(i) the period beginning on the third Business Day following either (x) the date of the Liquidity Provider’s receipt of the Notice of Borrowing for such LIBOR Advance or (y) the date of the withdrawal of funds from the Class A Cash Collateral Account for the purpose of paying interest on the Class A Certificates as contemplated by Section 2.06(a) hereof and, in either case, ending on the next Regular Distribution Date (or, if such day is not a Business Day, the next succeeding Business Day); and

(ii) each subsequent period commencing on the last day of the immediately preceding Interest Period and ending on the next Regular Distribution Date (or, if such day is not a Business Day, the next succeeding Business Day);

provided, however, that if (x) the Final Advance shall have been made, or (y) other outstanding Advances shall have been converted into the Final Advance, then the Interest Periods shall be successive periods of one month beginning on the third Business Day following the Liquidity Provider’s receipt of the Notice of Borrowing for such Final Advance (in the case of clause (x) above) or the Regular Distribution Date (or, if such day is not a Business Day, the next succeeding Business Day) following such conversion (in the case of clause (y) above).

“Lending Office” means the office of the Liquidity Provider presently located in New York, New York, or such other office as the Liquidity Provider from time to time shall notify the Borrower as its Lending Office hereunder; provided that the Liquidity Provider shall not change its Lending Office to another Lending Office outside the United States of America except in accordance with Section 3.01, 3.02 or 3.03 hereof.

[Revolving Credit Agreement (2007-1A)]

“LIBOR Advance” means an Advance bearing interest at a rate based upon the LIBOR Rate.

“LIBOR Rate” means, with respect to any Interest Period,

(i) the rate per annum appearing on Bloomberg L.P. page “BBAM” (or any successor or substitute therefor) at approximately 11:00 a.m. (London time) two Business Days before the first day of such Interest Period, as the rate for dollar deposits with a maturity comparable to such Interest Period, or

(ii) if the rate calculated pursuant to clause (i) above is not available, the average (rounded upwards, if necessary, to the next 1/16 of 1%) of the rates per annum at which deposits in dollars are offered for the relevant Interest Period by three banks of recognized standing selected by the Liquidity Provider in the London interbank market at approximately 11:00 a.m. (London time) two Business Days before the first day of such Interest Period in an amount approximately equal to the principal amount of the LIBOR Advance to which such Interest Period is to apply and for a period comparable to such Interest Period.

“Liquidity Event of Default” means the occurrence of either (a) the Acceleration of all of the Equipment Notes or (b) a United Bankruptcy Event.

“Liquidity Indemnitee” means (i) the Liquidity Provider, (ii) the Guarantor, (iii) the directors, officers, employees and agents of the Liquidity Provider and the Guarantor, and (iv) the successors and permitted assigns of the persons described in clauses (i), (ii) and (iii) inclusive.

“Liquidity Provider” has the meaning assigned to such term in the recital of parties to this Agreement.

“Maximum Available Commitment” means, subject to the proviso contained in the third sentence of Section 2.02(a), at any time of determination, (a) the Maximum Commitment at such time less (b) the aggregate amount of each Interest Advance outstanding at such time; provided that following a Provider Advance, a Special Termination Advance, or a Final Advance, the Maximum Available Commitment shall be zero.

“Maximum Commitment” means initially $48,285,460.44, as such amount may be reduced from time to time in accordance with Section 2.04(a).

“Non-Extension Advance” means an Advance made pursuant to Section 2.02(b).

“Notice of Borrowing” has the meaning assigned to such term in Section 2.02(e).

“Notice Date” has the meaning assigned to such term in Section 2.10.

[Revolving Credit Agreement (2007-1A)]

“Notice of Replacement Subordination Agent” has the meaning assigned to such term in Section 3.08.

“Performing Note Deficiency” means any time that less than 65% of the then aggregate outstanding principal amount of all Equipment Notes are Performing Equipment Notes.

“Prospectus Supplement” means the final Prospectus Supplement dated June 19, 2007 relating to the Certificates, as such Prospectus Supplement may be amended or supplemented.

“Provider Advance” means a Downgrade Advance or a Non-Extension Advance.

“Regulatory Change” has the meaning assigned to such term in Section 3.01.

“Replenishment Amount” has the meaning assigned to such term in Section 2.06(b).

“Required Amount” means, for any day, the sum of the aggregate amount of interest, calculated at the rate per annum equal to the Stated Interest Rate for the Class A Certificates, that would be payable on the Class A Certificates on each of the three successive semi-annual Regular Distribution Dates immediately following such day or, if such day is a Regular Distribution Date, on such day and the succeeding two semi-annual Regular Distribution Dates, in each case calculated on the basis of the Pool Balance of the Class A Certificates on such day and without regard to expected future distributions of principal on the Class A Certificates.

“Special Termination Advance” means an Advance made pursuant to Section 2.02(g).

“Special Termination Notice” means the Notice of Termination substantially in the form of Annex VIII to this Agreement.

“Termination Date” means the earliest to occur of the following: (i) the Expiry Date; (ii) the date on which the Borrower delivers to the Liquidity Provider a certificate, signed by a Responsible Officer of the Borrower, certifying that all of the Class A Certificates have been paid in full (or provision has been made for such payment in accordance with the Intercreditor Agreement and the Class A Trust Agreement) or are otherwise no longer entitled to the benefits of this Agreement; (iii) the date on which the Borrower delivers to the Liquidity Provider a certificate, signed by a Responsible Officer of the Borrower, certifying that a Replacement Liquidity Facility has been substituted for this Agreement in full pursuant to Section 3.5(e) of the Intercreditor Agreement; (iv) the fifth Business Day following the receipt by the Borrower of a Termination Notice or Special Termination Notice from the Liquidity Provider pursuant to Section 6.01 hereof; and (v) the date on which no Advance is or may (including by reason of reinstatement as herein provided) become available for a Borrowing hereunder.

“Termination Notice” means the Notice of Termination substantially in the form of Annex V to this Agreement.

“Transferee” has the meaning assigned to such term in Section 7.08(b).

“Unapplied Downgrade Advance” means any Downgrade Advance other than an Applied Downgrade Advance.

[Revolving Credit Agreement (2007-1A)]

“Unapplied Non-Extension Advance” means any Non-Extension Advance other than an Applied Non-Extension Advance.

“Unapplied Provider Advance” means any Provider Advance other than an Applied Provider Advance.

“Unapplied Special Termination Advance” means any Special Termination Advance other than an Applied Special Termination Advance.

“Unpaid Advance” has the meaning assigned to such term in Section 2.05.

(b) Terms Defined in the Intercreditor Agreement. Capitalized terms not otherwise defined in this Agreement shall have the respective meanings assigned to such terms in the Intercreditor Agreement.

ARTICLE II

AMOUNT AND TERMS OF THE COMMITMENT

Section 2.01 The Advances. The Liquidity Provider hereby irrevocably agrees, on the terms and conditions hereinafter set forth, to make Advances to the Borrower from time to time on any Business Day during the period from the Effective Date until 1:00 p.m. (New York City time) on the Expiry Date (unless the obligations of the Liquidity Provider shall be earlier terminated in accordance with the terms of Section 2.04(b)) in an aggregate amount at any time outstanding not to exceed the Maximum Commitment.

Section 2.02 Making the Advances. (a) Interest Advances shall be made in one or more Borrowings by delivery to the Liquidity Provider of one or more written and completed Notices of Borrowing in substantially the form of Annex I attached hereto, signed by a Responsible Officer of the Borrower, in an amount not exceeding the Maximum Available Commitment at such time and shall be used solely for the payment when due of interest on the Class A Certificates at the Stated Interest Rate therefor in accordance with Section 3.5(a) of the Intercreditor Agreement. Each Interest Advance made hereunder shall automatically reduce the Maximum Available Commitment and the amount available to be borrowed hereunder by subsequent Advances by the amount of such Interest Advance (subject to reinstatement as provided in the next sentence). Upon repayment to the Liquidity Provider in full or in part of the amount of any Interest Advance made pursuant to this Section 2.02(a), together with accrued interest thereon (as provided herein), the Maximum Available Commitment shall be reinstated by an amount equal to the amount of the Interest Advance so repaid but not to exceed the Maximum Commitment; provided, however, that the Maximum Available Commitment shall not be so reinstated (x) at any time if (i) a Liquidity Event of Default shall have occurred and be continuing and (ii) there is a Performing Note Deficiency or (y) at any time after the making of a Provider Advance, a Final Advance or a Special Termination Advance or after any Interest Advance shall have been converted into a Final Advance.

(b) A Non-Extension Advance shall be made in a single Borrowing if this Agreement is not extended in accordance with Section 3.5(d) of the Intercreditor Agreement (unless a Replacement Liquidity Facility to replace this Agreement shall have been delivered to the

[Revolving Credit Agreement (2007-1A)]

Borrower as contemplated by said Section 3.5(d) within the time period specified in such Section) by delivery to the Liquidity Provider of a written and completed Notice of Borrowing in substantially the form of Annex II attached hereto, signed by a Responsible Officer of the Borrower, in an amount equal to the Maximum Available Commitment at such time, and shall be used to fund the Class A Cash Collateral Account in accordance with said Section 3.5(d) and Section 3.5(f) of the Intercreditor Agreement.

(c) A Downgrade Advance shall be made in a single Borrowing upon the occurrence of a Downgrade Event (as provided for in Section 3.5(c) of the Intercreditor Agreement) unless a Replacement Liquidity Facility to replace this Agreement shall have been previously delivered to the Borrower in accordance with Section 3.5(c), by delivery to the Liquidity Provider of a written and completed Notice of Borrowing in substantially the form of Annex III attached hereto, signed by a Responsible Officer of the Borrower, in an amount equal to the Maximum Available Commitment at such time, and shall be used solely to fund the Class A Cash Collateral Account in accordance with said Section 3.5(c) and Section 3.5(f) of the Intercreditor Agreement.

(d) A Final Advance shall be made in a single Borrowing upon the receipt by the Borrower of a Termination Notice from the Liquidity Provider pursuant to Section 6.01 hereof by delivery to the Liquidity Provider of a written and completed Notice of Borrowing in substantially the form of Annex IV attached hereto, signed by a Responsible Officer of the Borrower, in an amount equal to the Maximum Available Commitment at such time, and shall be used solely to fund the Class A Cash Collateral Account (in accordance with Sections 3.5(f) and 3.5(i) of the Intercreditor Agreement).

(e) Each Borrowing shall be made on notice in writing (a “Notice of Borrowing”) in substantially the form required by Section 2.02(a), 2.02(b), 2.02(c), 2.02(d) or 2.02 (g), as the case may be, given by the Borrower to the Liquidity Provider. Each Notice of Borrowing shall be effective upon delivery of a copy thereof to the Liquidity Provider’s office at the address specified in Section 7.02. If a Notice of Borrowing is delivered by the Borrower in respect of any Borrowing no later than 1:00 p.m. (New York City time) on a Business Day, upon satisfaction of the conditions precedent set forth in Section 4.02 with respect to a requested Borrowing, the Liquidity Provider shall make available to the Borrower, in accordance with its payment instructions, the amount of such Borrowing in U.S. dollars and immediately available funds, before 4:00 p.m. (New York City time) on such Business Day or on such later Business Day specified in such Notice of Borrowing. If a Notice of Borrowing is delivered by the Borrower in respect of any Borrowing on a day that is not a Business Day or after 1:00 p.m. (New York City time) on a Business Day, upon satisfaction of the conditions precedent set forth in Section 4.02 with respect to a requested Borrowing, the Liquidity Provider shall make available to the Borrower, in accordance with its payment instructions, the amount of such Borrowing in U.S. dollars and in immediately available funds, before 12:00 Noon (New York City time) on the first Business Day next following the day of receipt of such Notice of Borrowing or on such later Business Day specified by the Borrower in such Notice of Borrowing. Payments of proceeds of a Borrowing shall be made by wire transfer of immediately available funds to the Borrower in accordance with such wire transfer instructions as the Borrower shall furnish from time to time to the Liquidity Provider for such purpose. Each Notice of Borrowing shall be irrevocable and binding on the Borrower.

[Revolving Credit Agreement (2007-1A)]

(f) Upon the making of any Advance requested pursuant to a Notice of Borrowing, in accordance with the Borrower’s payment instructions, the Liquidity Provider shall be fully discharged of its obligation hereunder with respect to such Notice of Borrowing, and the Liquidity Provider shall not thereafter be obligated to make any further Advances hereunder in respect of such Notice of Borrowing to the Borrower or to any other Person. If the Liquidity Provider makes an Advance requested pursuant to a Notice of Borrowing before 12:00 Noon (New York City time) on the second Business Day after the date of payment specified in Section 2.02(e), the Liquidity Provider shall have fully discharged its obligations hereunder with respect to such Advance and an event of default shall not have occurred hereunder. Following the making of any Advance pursuant to Section 2.02(b), (c), (d) or (g) hereof to fund the Class A Cash Collateral Account, the Liquidity Provider shall have no interest in or rights to the Class A Cash Collateral Account, the funds constituting such Advance or any other amounts from time to time on deposit in the Class A Cash Collateral Account; provided that the foregoing shall not affect or impair the obligations of the Subordination Agent to make the distributions contemplated by Section 3.5(e) or (f) of the Intercreditor Agreement, and provided further, that the foregoing shall not affect or impair the rights of the Liquidity Provider to provide written instructions with respect to the investment and reinvestment of amounts in the Cash Collateral Accounts to the extent provided in Section 2.2(b) of the Intercreditor Agreement. By paying to the Borrower proceeds of Advances requested by the Borrower in accordance with the provisions of this Agreement, the Liquidity Provider makes no representation as to, and assumes no responsibility for, the correctness or sufficiency for any purpose of the amount of the Advances so made and requested.

(g) A “Special Termination Advance” shall be made in a single Borrowing upon the receipt by the Borrower of a Special Termination Notice from the Liquidity Provider pursuant to Section 6.01(b), by delivery to the Liquidity Provider of a written and completed Notice of Borrowing in substantially the form of Annex VII, signed by a Responsible Officer of the Borrower, in an amount equal to the Maximum Available Commitment at such time, and shall be used solely to fund the Class A Cash Collateral Account (in accordance with Section 3.5(f) and Section 3.5(k) of the Intercreditor Agreement).

Section 2.03 Fees. The Borrower agrees to pay to the Liquidity Provider the fees set forth in the Fee Letter applicable to this Agreement.

Section 2.04 Automatic Reductions and Termination of the Maximum Commitment.

(a) Automatic Reduction. Promptly following each date on which the Required Amount is reduced as a result of a reduction in the Pool Balance of the Class A Certificates or otherwise, the Maximum Commitment shall automatically be reduced to an amount equal to such reduced Required Amount (as calculated by the Borrower). The Borrower shall give notice of any such automatic reduction of the Maximum Commitment to the Liquidity Provider within two Business Days thereof. The failure by the Borrower to furnish any such notice shall not affect such automatic reduction of the Maximum Commitment.

(b) Termination. Upon the making of any Provider Advance, or the Special Termination Advance, or the making of or conversion to a Final Advance hereunder or the occurrence of the Termination Date, the obligation of the Liquidity Provider to make further Advances hereunder shall automatically and irrevocably terminate, and the Borrower shall not be entitled to request any further Borrowing hereunder.

[Revolving Credit Agreement (2007-1A)]

Section 2.05 Repayments of Interest Advances , the Special Termination Advance or the Final Advance. Subject to Sections 2.06, 2.07 and 2.09 hereof, the Borrower hereby agrees, without notice of an Advance or demand for repayment from the Liquidity Provider (which notice and demand are hereby waived by the Borrower), to pay, or to cause to be paid, to the Liquidity Provider on each date on which the Liquidity Provider shall make an Interest Advance, the Special Termination Advance or the Final Advance, an amount equal to (a) the amount of such Advance (any such Advance, until repaid, is referred to herein as an “Unpaid Advance”) (if multiple Interest Advances are outstanding any such repayment to be applied in the order in which such Interest Advances have been made, starting with the earliest), plus (b) interest on the amount of each such Unpaid Advance as provided in Section 3.07 hereof; provided that if (i) the Liquidity Provider shall make a Provider Advance at any time after making one or more Interest Advances which shall not have been repaid in accordance with this Section 2.05 or (ii) this Liquidity Facility shall become a Downgraded Facility or Non-Extended Facility at any time when unreimbursed Interest Advances have reduced the Maximum Available Commitment to zero, then such Interest Advances shall cease to constitute Unpaid Advances and shall be deemed to have been changed into an Applied Downgrade Advance or an Applied Non-Extension Advance, as the case may be, for all purposes of this Agreement (including, without limitation, for the purpose of determining when such Interest Advance is required to be repaid to the Liquidity Provider in accordance with Section 2.06 and for the purposes of Section 2.06(b)); provided, further, that amounts in respect of a Special Termination Advance withdrawn from the Class A Cash Collateral Account for the purpose of paying interest on the Class A Certificates in accordance with Section 3.5(f) of the Intercreditor Agreement (the amount of any such withdrawal being an “Applied Special Termination Advance”) shall thereafter (subject to Section 2.06(b)) be treated as an Interest Advance under this Agreement for purposes of determining the Applicable Liquidity Rate for interest payable thereon; and provided, further, that if, following the making of a Special Termination Advance, the Liquidity Provider delivers a Termination Notice to the Borrower pursuant to Section 6.01(a), such Special Termination Advance shall thereafter be converted to and treated as a Final Advance under this Agreement for purposes of determining the Applicable Liquidity Rate for interest payable thereon and the obligation for repayment thereof and as an Applied Special Termination Advance for purposes of Section 2.6(c) of the Intercreditor Agreement. The Borrower and the Liquidity Provider agree that the repayment in full of each Interest Advance, Special Termination Advance and Final Advance on the date such Advance is made is intended to be a contemporaneous exchange for new value given to the Borrower by the Liquidity Provider.

Section 2.06 Repayments of Provider Advances. (a) Amounts advanced hereunder in respect of a Provider Advance shall be deposited in the Class A Cash Collateral Account, invested and withdrawn from the Class A Cash Collateral Account as set forth in Sections 3.5(c), (d), (e) and (f) of the Intercreditor Agreement. Subject to Sections 2.07 and 2.09, the Borrower agrees to pay to the Liquidity Provider, on each Regular Distribution Date, commencing on the first Regular Distribution Date after the making of a Provider Advance, interest on the principal amount of any such Provider Advance as provided in Section 3.07; provided, however, that amounts in respect of a Provider Advance withdrawn from the Class A Cash Collateral Account for the purpose of paying interest on the Class A Certificates in accordance with Section 3.5(f) of

[Revolving Credit Agreement (2007-1A)]

the Intercreditor Agreement (the amount of any such withdrawal being (y) in the case of a Downgrade Advance, an “Applied Downgrade Advance” and (z) in the case of a Non-Extension Advance, an “Applied Non-Extension Advance” and, together with an Applied Downgrade Advance, an “Applied Provider Advance”) shall thereafter (subject to Section 2.06(b)) be treated as an Interest Advance under this Agreement for purposes of determining the Applicable Liquidity Rate for interest payable thereon and the dates on which such interest is payable; provided further, however, that if, following the making of a Provider Advance, the Liquidity Provider delivers a Termination Notice to the Borrower pursuant to Section 6.01 hereof, such Provider Advance shall thereafter be converted to and treated as a Final Advance under this Agreement for purposes of determining the Applicable Liquidity Rate for interest payable thereon and the obligation for repayment thereof and as an Applied Downgrade Advance or Applied Non-Extension Advance, as the case may be, for the purposes of Section 2.6(c) of the Intercreditor Agreement. Subject to Sections 2.07 and 2.09 hereof, immediately upon the withdrawal of any amounts from the Class A Cash Collateral Account on account of a reduction in the Required Amount, the Borrower shall repay to the Liquidity Provider a portion of the Provider Advances in a principal amount equal to the amount of such reduction, plus interest on the principal amount prepaid as provided in Section 3.07 hereof.

(b) At any time when an Applied Provider Advance (or any portion thereof) is outstanding, upon the deposit in the Class A Cash Collateral Account of any amount pursuant to clause “fourth” of Section 3.2 of the Intercreditor Agreement (any such amount being a “Replenishment Amount”) for the purpose of replenishing or increasing the balance thereof up to the amount of the Required Amount at such time, (i) the aggregate outstanding principal amount of all Applied Provider Advances (and of Provider Advances treated as an Interest Advance for purposes of determining the Applicable Liquidity Rate for interest payable thereon) shall be automatically reduced by the amount of such Replenishment Amount (if multiple Applied Provider Advances are outstanding, such Replenishment Amount to be applied in the order in which such Applied Provider Advances have been made, starting with the earliest) and (ii) the aggregate outstanding principal amount of all Unapplied Provider Advances shall be automatically increased by the amount of such Replenishment Amount.

(c) Upon the provision of a Replacement Liquidity Facility in replacement of this Agreement in accordance with Section 3.5(e) of the Intercreditor Agreement, amounts remaining on deposit in the Class A Cash Collateral Account after giving effect to any Applied Provider Advance or Applied Special Termination Advance on the date of such replacement shall be reimbursed to the replaced Liquidity Provider, but only to the extent such amounts are necessary to repay in full to the replaced Liquidity Provider all amounts owing to it hereunder.

Section 2.07 Payments to the Liquidity Provider Under the Intercreditor Agreement. In order to provide for payment or repayment to the Liquidity Provider of any amounts hereunder, the Intercreditor Agreement provides that amounts available and referred to in Articles II and III of the Intercreditor Agreement, to the extent payable to the Liquidity Provider pursuant to the terms of the Intercreditor Agreement (including, without limitation, Section 3.5(f) of the Intercreditor Agreement), shall be paid to the Liquidity Provider in accordance with the terms thereof. Amounts so paid to, and not required to be returned by, the Liquidity Provider shall be applied by the Liquidity Provider to Liquidity Obligations then due and payable in accordance with the Intercreditor Agreement and shall discharge in full the corresponding obligations of the Borrower hereunder (or, if not provided for in the Intercreditor Agreement, then in such manner as the Liquidity Provider shall deem appropriate).

[Revolving Credit Agreement (2007-1A)]

Section 2.08 Book Entries. The Liquidity Provider shall maintain in accordance with its usual practice an account or accounts evidencing the indebtedness of the Borrower resulting from Advances made from time to time and the amounts of principal and interest payable hereunder and paid from time to time in respect thereof; provided, however, that the failure by the Liquidity Provider to maintain such account or accounts shall not affect the obligations of the Borrower in respect of Advances.

Section 2.09 Payments from Available Funds Only. All payments to be made by the Borrower under this Agreement, including, without limitation, Sections 7.05 and 7.07, shall be made only from the amounts that constitute Scheduled Payments, Special Payments or payments under the Fee Letter and Section 7.1 of the Participation Agreements and only to the extent that the Borrower shall have sufficient income or proceeds therefrom to enable the Borrower to make payments in accordance with the terms hereof after giving effect to the priority of payments provisions set forth in the Intercreditor Agreement. The Liquidity Provider agrees that it will look solely to such amounts in respect of payments to be made by the Borrower hereunder to the extent available for distribution to it as provided in the Intercreditor Agreement and this Agreement and that the Borrower, in its individual capacity, is not personally liable to it for any amounts payable or liability under this Agreement except as expressly provided in this Agreement, the Intercreditor Agreement or any Participation Agreement. Amounts on deposit in the Class A Cash Collateral Account shall be available to the Borrower to make payments under this Agreement only to the extent and for the purposes expressly contemplated in Section 3.5(f) of the Intercreditor Agreement.

Section 2.10 Extension of the Expiry Date; Non-Extension Advance. If the Liquidity Provider advises the Borrower before the 25th day prior to the immediately following anniversary date of the Closing Date (the “Notice Date”) that its obligation to make Advances hereunder shall not be so extended beyond such anniversary date (and if the Liquidity Provider shall not have been replaced in accordance with Section 3.5(e) of the Intercreditor Agreement), the Borrower shall be entitled on and after the Notice Date (but prior to such anniversary date) to request a Non-Extension Advance in accordance with Section 2.02(b) hereof and Section 3.5(d) of the Intercreditor Agreement.

ARTICLE III

OBLIGATIONS OF THE BORROWER

Section 3.01 Increased Costs. The Borrower shall pay to the Liquidity Provider from time to time such amounts as may be necessary to compensate the Liquidity Provider for any increased costs incurred by the Liquidity Provider which are attributable to its making or maintaining any Advances hereunder or its obligation to make any such Advances hereunder, or any reduction in any amount receivable by the Liquidity Provider under this Agreement or the Intercreditor Agreement in respect of any such Advances or such obligation (such increases in costs and reductions in amounts receivable being herein called “Additional Costs”), resulting from any change after the date of this Agreement in U.S. federal, state, municipal, or foreign

[Revolving Credit Agreement (2007-1A)]

laws or regulations (including Regulation D of the Board of Governors of the Federal Reserve System), or the adoption or making after the date of this Agreement of any interpretations, directives, or requirements applying to a class of banks including the Liquidity Provider under any U.S. federal, state, municipal, or any foreign laws or regulations (whether or not having the force of law) by any court, central bank or monetary authority charged with the interpretation or administration thereof (a “Regulatory Change”), which: (1) changes the basis of taxation of any amounts payable to the Liquidity Provider under this Agreement in respect of any such Advances or such obligation (other than with respect to Excluded Taxes or Indemnified Taxes); or (2) imposes or modifies any reserve, special deposit, compulsory loan or similar requirements relating to any extensions of credit or other assets of, or any deposits with other liabilities of, the Liquidity Provider (including any such Advances or such obligation or any deposits referred to in the definition of LIBOR Rate or related definitions). The Liquidity Provider agrees to use reasonable efforts (consistent with its internal policies and applicable legal and regulatory restrictions) to change the jurisdiction of its Lending Office if making such change would avoid the need for, or reduce the amount of, any amount payable under this Section that may thereafter accrue and would not, in the reasonable judgment of the Liquidity Provider, be otherwise disadvantageous to the Liquidity Provider.

The Liquidity Provider will notify the Borrower of any event occurring after the date of this Agreement that will entitle the Liquidity Provider to compensation pursuant to this Section 3.01 as promptly as practicable after it obtains knowledge thereof and determines to request such compensation, which notice shall describe in reasonable detail the calculation of the amounts owed under this Section; provided, that if the Liquidity Provider fails to give such notice within 180 days after it obtains such knowledge, the Liquidity Provider shall, with respect to any costs resulting from such event, only be entitled to payment under this Section 3.01 for costs incurred from and after the date 180 days prior to the date the Liquidity Provider does give such notice. Determinations by the Liquidity Provider for purposes of this Section 3.01 of the effect of any Regulatory Change on its costs of making or maintaining Advances or on amounts receivable by it in respect of Advances, and of the additional amounts required to compensate the Liquidity Provider in respect of any Additional Costs, shall be prima facie evidence of the amount owed under this Section.

Notwithstanding the preceding two paragraphs, the Liquidity Provider and the Subordination Agent agree that (i) the initial Liquidity Provider and (ii) any permitted assignee or participant of the initial Liquidity Provider which is not a bank, shall not be entitled to the benefits of the preceding two paragraphs (but without limiting the provisions of Section 7.08 hereof).

Section 3.02 Capital Adequacy. If (1) the adoption, after the date hereof, of any applicable governmental law, rule or regulation regarding capital adequacy, (2) any change, after the date hereof, in the interpretation or administration of any such law, rule or regulation by any central bank or other governmental authority charged with the interpretation or administration thereof or (3) compliance by the Liquidity Provider or any corporation or bank controlling the Liquidity Provider with any applicable guideline or request of general applicability, issued after the date hereof, by any central bank or other governmental authority (whether or not having the force of law) that constitutes a change of the nature described in clause (2), has the effect of requiring an increase in the amount of capital required to be maintained by the Liquidity

[Revolving Credit Agreement (2007-1A)]

Provider or any corporation controlling the Liquidity Provider and such increase is based upon the Liquidity Provider’s obligations hereunder (including funded obligations) and other similar obligations, the Borrower shall, subject to the provisions of the next paragraph, pay to the Liquidity Provider from time to time such additional amount or amounts as are necessary to compensate the Liquidity Provider for such portion of such increase as shall be reasonably allocable to the Liquidity Provider’s obligations to the Borrower hereunder.

The Liquidity Provider will notify the Borrower of any event occurring after the date of this Agreement that will entitle the Liquidity Provider to compensation pursuant to this Section 3.02 as promptly as practicable after it obtains knowledge thereof and determines to request such compensation, which notice shall describe in reasonable detail the calculation of the amounts owed under this Section; provided, that if the Liquidity Provider fails to give such notice within 180 days after it obtains such knowledge, the Liquidity Provider shall, with respect to any costs resulting from such event, only be entitled to payment under this Section 3.02 for costs incurred from and after the date 180 days prior to the date the Liquidity Provider does give such notice. Determinations by the Liquidity Provider for purposes of this Section 3.02 of the effect of any increase in the amount of capital required to be maintained by the Liquidity Provider and of the amount allocable to the Liquidity Provider’s obligations to the Borrower hereunder shall be prima facie evidence of the amounts owed under this Section, absent manifest error.

Section 3.03 Payments Free of Deductions. (a) Unless required by applicable law, all payments made by the Borrower under this Agreement shall be made free and clear of, and without reduction for or on account of, any present or future Taxes of any nature whatsoever now or hereafter imposed, levied, collected, withheld or assessed. If any Taxes are required to be withheld from any amounts payable to the Liquidity Provider under this Agreement, (i) the Borrower shall within the time prescribed therefor by applicable law pay to the appropriate governmental or taxing authority the full amount of any such Taxes (and any additional Taxes in respect of the additional amounts payable under clause (ii) hereof) and make such reports or returns in connection therewith at the time or times and in the manner prescribed by applicable law, and (ii) in the case of Taxes, other than Excluded Taxes (such non-excluded Taxes being referred to herein, collectively, as “Indemnified Taxes” and each, individually, as a “Indemnified Tax”), the amounts so payable to the Liquidity Provider shall be increased to the extent necessary to yield to the Liquidity Provider (after payment of all Taxes) interest or any other such amounts payable under this Agreement at the rates or in the amounts specified in this Agreement. The Liquidity Provider agrees to use reasonable efforts (consistent with its internal policy and legal and regulatory restrictions) to change the jurisdiction of its Lending Office if making such change would avoid the need for, or reduce the amount of, any such additional amounts that may thereafter accrue and would not, in the reasonable judgment of the Liquidity Provider, be otherwise disadvantageous to the Liquidity Provider. From time to time upon the reasonable request of the Borrower, the Liquidity Provider agrees to provide to the Borrower

[Revolving Credit Agreement (2007-1A)]

such original Internal Revenue Service Forms (including W-8BEN, W-8ECI or W-9), as appropriate with respect to Liquidity Provider, or any successor or other form prescribed by the Internal Revenue Service, certifying as to any available exemption from or reduction in the rate of United States withholding tax on payments pursuant to this Agreement. Within 30 days after the date of each payment hereunder, the Borrower shall furnish to the Liquidity Provider the original or a certified copy of (or other documentary evidence of) the payment of the Indemnified Taxes applicable to such payment.

(b) Unless required by applicable law, all payments (including, without limitation, Advances) made by the Liquidity Provider under this Agreement shall be made free and clear of, and without reduction for or on account of, any Taxes. If any Taxes are required to be withheld or deducted from any amounts payable to the Borrower under this Agreement, the Liquidity Provider shall (i) within the time prescribed therefor by applicable law pay to the appropriate governmental or taxing authority the full amount of any such Taxes (and any additional Taxes in respect of the additional amounts payable under clause (ii) hereof) and make such reports or returns in connection therewith at the time or times and in the manner prescribed by applicable law, and (ii) pay to the Borrower an additional amount which (after deduction of all such Taxes) will be sufficient to yield to the Borrower the full amount which would have been received by it had no such withholding or deduction been made. Within 30 days after the date of each payment hereunder, the Liquidity Provider shall furnish to the Borrower the original or a certified copy of (or other documentary evidence of) the payment of the Taxes applicable to such payment.

(c) If any exemption from, or reduction in the rate of, any Taxes is reasonably available to the Borrower to establish that payments under this Agreement are exempt from (or entitled to a reduced rate of) tax, the Borrower shall deliver to the Liquidity Provider such form or forms and such other evidence of the eligibility of the Borrower for such exemption or reduction as the Liquidity Provider may reasonably identify to the Borrower as being required as a condition to exemption from, or reduction in the rate of, any Taxes.

Section 3.04 Payments. The Borrower shall make or cause to be made each payment to the Liquidity Provider under this Agreement so as to cause the same to be received by the Liquidity Provider not later than 1:00 P.M. (New York City time) on the day when due. The Borrower shall make all such payments in lawful money of the United States of America, to the Liquidity Provider in immediately available funds, by wire transfer to the account of Morgan Stanley Senior Funding, Inc. at Citibank, N.A. ABA No. 021000089, Account No. 406-99-776, Reference: United Air Lines 2007-1 EETC, or to such other account as the Liquidity Provider may from time to time direct the Borrower.

Section 3.05 Computations. All computations of interest based on the Base Rate shall be made on the basis of a year of 365 or 366 days, as the case may be, and all computations of interest based on the LIBOR Rate shall be made on the basis of a year of 360 days, in each case for the actual number of days (including the first day but excluding the last day) occurring in the period for which such interest is payable.

Section 3.06 Payment on Non-Business Days. Whenever any payment to be made hereunder to the Liquidity Provider shall be stated to be due on a day other than a Business Day, such payment shall be made on the next succeeding Business Day (and if so made, shall be deemed to have been made when due).

[Revolving Credit Agreement (2007-1A)]

Section 3.07 Interest. (a) Subject to Section 2.09, the Borrower shall pay, or shall cause to be paid, without duplication, interest on (i) the unpaid principal amount of each Advance from and including the date of such Advance (or, in the case of an Applied Provider Advance or Applied Special Termination Advance, from and including the date on which the amount thereof was withdrawn from the Class A Cash Collateral Account to pay interest on the Class A Certificates) to but excluding the date such principal amount shall be paid in full (or, in the case of an Applied Provider Advance or Applied Special Termination Advance, the date on which the Class A Cash Collateral Account is fully replenished in respect of such Advance) and (ii) any other amount due hereunder (whether fees, commissions, expenses or other amounts or, to the extent permitted by law, installments of interest on Advances or any such other amount) that is not paid when due (whether at stated maturity, by acceleration or otherwise) from and including the due date thereof to but excluding the date such amount is paid in full, in each such case, at a fluctuating interest rate per annum for each day equal to the Applicable Liquidity Rate (as defined below) for such Advance or such other amount, as the case may be, as in effect for such day, but in no event at a rate per annum greater than the maximum rate permitted by applicable law; provided, however, that, if at any time the otherwise applicable interest rate as set forth in this Section 3.07 shall exceed the maximum rate permitted by applicable law, then any subsequent reduction in such interest rate will not reduce the rate of interest payable pursuant to this Section 3.07 below the maximum rate permitted by applicable law until the total amount of interest accrued equals the amount of interest that would have accrued if such otherwise applicable interest rate as set forth in this Section 3.07 had at all times been in effect.

(b) Except as provided in clause (e) below, each Advance will be either a Base Rate Advance or a LIBOR Advance as provided in this Section. Each such Advance will be a Base Rate Advance for the period from the date of its borrowing to (but excluding) the third Business Day following the Liquidity Provider’s receipt of the Notice of Borrowing for such Advance. Thereafter, such Advance shall be a LIBOR Advance.

(c) Each LIBOR Advance shall bear interest during each Interest Period at a rate per annum equal to the LIBOR Rate for such Interest Period plus the Applicable Margin for such LIBOR Advance, payable in arrears on the last day of such Interest Period and, in the event of the payment of principal of such LIBOR Advance on a day other than such last day, on the date of such payment (to the extent of interest accrued on the amount of principal repaid).

(d) Each Base Rate Advance shall bear interest at a rate per annum equal to the Base Rate plus the Applicable Margin for such Base Rate Advance, payable in arrears on each Regular Distribution Date and, in the event of the payment of principal of such Base Rate Advance on a day other than a Regular Distribution Date, on the date of such payment (to the extent of interest accrued on the amount of principal repaid).

(e) Each outstanding Unapplied Non-Extension Advance, Unapplied Downgrade Advance and Unapplied Special Termination Advance shall bear interest in an amount equal to the Investment Earnings on amounts on deposit in the Class A Cash Collateral Account plus the Applicable Margin for such Unapplied Non-Extension Advance, Unapplied Downgrade Advance

[Revolving Credit Agreement (2007-1A)]

or Unapplied Special Termination Advance, as applicable, on the amount of such Unapplied Non-Extension Advance, Unapplied Downgrade Advance or Unapplied Special Termination Advance from time to time, payable in arrears on each Regular Distribution Date.

(f) Each amount not paid when due hereunder (whether fees, commissions, expenses or other amounts or, to the extent permitted by applicable law, installments of interest on Advances but excluding Advances) shall bear interest at a rate per annum equal to the Base Rate plus 2.00% per annum until paid.

(g) Each change in the Base Rate shall become effective immediately. The rates of interest specified in this Section 3.07 with respect to any Advance or other amount shall be referred to as the “Applicable Liquidity Rate”.

Section 3.08 Replacement of Borrower. From time to time and subject to the successor Borrower’s meeting the eligibility requirements set forth in Section 6.9 of the Intercreditor Agreement applicable to the Subordination Agent, upon the effective date and time specified in a written and completed Notice of Replacement Subordination Agent in substantially the form of Annex VI attached hereto (a “Notice of Replacement Subordination Agent”) delivered to the Liquidity Provider by the then Borrower, the successor Borrower designated therein shall be substituted for the Borrower for all purposes hereunder.

Section 3.09 Funding Loss Indemnification. The Borrower shall pay to the Liquidity Provider, upon the request of the Liquidity Provider, such amount or amounts as shall be sufficient (in the reasonable opinion of the Liquidity Provider) to compensate it for any loss, cost, or expense incurred by reason of the liquidation or redeployment of deposits or other funds acquired by the Liquidity Provider to fund or maintain any LIBOR Advance (but excluding loss of anticipated profits) incurred as a result of:

(1) Any repayment of a LIBOR Advance on a date other than the last day of the Interest Period for such Advance; or

(2) Any failure by the Borrower to borrow a LIBOR Advance on the date for borrowing specified in the relevant notice under Section 2.02.

Section 3.10 Illegality. Notwithstanding any other provision in this Agreement, if any change in any applicable law, rule or regulation, or any change in the interpretation or administration thereof by any governmental authority, central bank or comparable agency charged with the interpretation or administration thereof, or compliance by the Liquidity Provider (or its Lending Office) with any request or directive (whether or not having the force of law) of any such authority, central bank or comparable agency shall make it unlawful or impossible for the Liquidity Provider (or its Lending Office) to maintain or fund its LIBOR Advances, then upon notice to the Borrower by the Liquidity Provider, the outstanding principal amount of the LIBOR Advances shall be converted to Base Rate Advances (a) immediately upon demand of the Liquidity Provider, if such change or compliance with such request, in the judgment of the Liquidity Provider, requires immediate repayment; or (b) at the expiration of the last Interest Period to expire before the effective date of any such change or request. The Liquidity Provider agrees to use reasonable efforts (consistent with its internal policies and

[Revolving Credit Agreement (2007-1A)]

applicable legal and regulatory restrictions) to change the jurisdiction of its Lending Office if making such change would avoid or cure the aforesaid illegality and would not, in the reasonable judgment of the Liquidity Provider, be otherwise disadvantageous to the Liquidity Provider.

ARTICLE IV

CONDITIONS PRECEDENT

Section 4.01 Conditions Precedent to Effectiveness of Section 2.01. Section 2.01 of this Agreement shall become effective on and as of the first date (the “Effective Date”) on which the following conditions precedent have been satisfied or waived:

(a) The Liquidity Provider shall have received each of the following, and in the case of each document delivered pursuant to paragraphs (i), (ii) and (iii), each in form and substance satisfactory to the Liquidity Provider:

(i) This Agreement duly executed on behalf of the Borrower and the Fee Letter applicable to this Agreement duly executed on behalf of the Borrower;

(ii) The Intercreditor Agreement duly executed on behalf of each of the parties thereto (other than the Liquidity Provider);

(iii) Fully executed copies of each of the Operative Agreements executed and delivered on or before the Closing Date (other than this Agreement, the Guarantee Agreement, the Fee Letter and the Intercreditor Agreement);

(iv) A copy of the Prospectus Supplement and specimen copies of the Class A Certificates;

(v) An executed copy of each document, instrument, certificate and opinion delivered on or before the Closing Date pursuant to the Class A Trust Agreement, the Note Purchase Agreement, the Intercreditor Agreement and the other Operative Agreements (in the case of each such opinion, other than the opinion of counsel for the Underwriters, either addressed to the Liquidity Provider or accompanied by a letter from the counsel rendering such opinion to the effect that the Liquidity Provider is entitled to rely on such opinion as of its date as if it were addressed to the Liquidity Provider);

(vi) Evidence that there shall have been made and shall be in full force and effect, all filings, recordings and/or registrations, and there shall have been given or taken any notice or other similar action as may be reasonably necessary or, to the extent reasonably requested by the Liquidity Provider, reasonably advisable, in order to establish, perfect, protect and preserve the right, title and interest, remedies, powers, privileges, liens and security interests of, or for the benefit of, the Trustees, the Borrower and the Liquidity Provider created by the Operative Agreements executed and delivered on or before the Closing Date;

(vii) An agreement from United, pursuant to which United agrees to provide copies of quarterly financial statements and audited annual financial statements to the Liquidity Provider provided that so long as United is subject to the reporting requirements of the Securities Exchange Act of 1934, such information will be considered provided if it is made available on the EDGAR database of the Securities and Exchange Commission;

[Revolving Credit Agreement (2007-1A)]

(viii) Legal opinions from (a) Morris, James, LLP, special counsel to the Borrower and (b) Vedder, Price, Kaufman & Kammholz, P.C., special counsel to United, each in form and substance reasonably satisfactory to the Liquidity Provider; and

(ix) Such other documents, instruments, opinions and approvals pertaining to the transactions contemplated hereby or by the other Operative Agreements as the Liquidity Provider shall have reasonably requested.

(b) The following statement shall be true on and as of the Effective Date: no event has occurred and is continuing, or would result from the entering into of this Agreement or the making of any Advance, which constitutes a Liquidity Event of Default.

(c) The Liquidity Provider shall have received payment in full of all fees and other sums required to be paid to or for the account of the Liquidity Provider on or prior to the Effective Date.

(d) All conditions precedent to the issuance of the Certificates under the Trust Agreements shall have been satisfied or waived and all conditions precedent to the purchase of the Class A Certificates, the Class B Certificates and the Class C Certificates by the Underwriters under the Underwriting Agreement shall have been satisfied or waived.

(e) The Borrower shall have received a certificate, dated the date hereof, signed by a duly authorized representative of the Liquidity Provider, certifying that all conditions precedent to the effectiveness of Section 2.01 have been satisfied or waived.

Section 4.02 Conditions Precedent to Borrowing. The obligation of the Liquidity Provider to make an Advance on the occasion of each Borrowing shall be subject to the conditions precedent that the Effective Date shall have occurred and, on or prior to the date of such Borrowing, the Borrower shall have delivered a Notice of Borrowing which conforms to the terms and conditions of this Agreement and has been completed as may be required by the relevant form of the Notice of Borrowing for the type of Advance requested.

ARTICLE V

COVENANTS

Section 5.01 Affirmative Covenants of the Borrower. So long as any Advance shall remain unpaid or the Liquidity Provider shall have any Maximum Commitment hereunder or the Borrower shall have any obligation to pay any amount to the Liquidity Provider hereunder, the Borrower will, unless the Liquidity Provider shall otherwise consent in writing:

(a) Performance of this and Other Agreements. Punctually pay or cause to be paid all amounts payable by it under this Agreement and the other Operative Agreements and observe and perform in all material respects the conditions, covenants and requirements applicable to it contained in this Agreement and the other Operative Agreements.

[Revolving Credit Agreement (2007-1A)]

(b) Reporting Requirements. Furnish to the Liquidity Provider with reasonable promptness, such information and data with respect to the transactions contemplated by the Operative Agreements as from time to time may be reasonably requested by the Liquidity Provider; and permit the Liquidity Provider, upon reasonable notice, to inspect the Borrower’s books and records with respect to such transactions and to meet with officers and employees of the Borrower to discuss such transactions.

(c) Certain Operative Agreements. Furnish to the Liquidity Provider with reasonable promptness, such Operative Agreements entered into after the date hereof as from time to time may be reasonably requested by the Liquidity Provider.

Section 5.02 Negative Covenants of the Borrower. So long as any Advance shall remain unpaid or the Liquidity Provider shall have any Maximum Commitment hereunder or the Borrower shall have any obligation to pay any amount to the Liquidity Provider hereunder, the Borrower will not appoint or permit or suffer to be appointed any successor Borrower without the prior written consent of the Liquidity Provider, which consent shall not be unreasonably withheld or delayed.

ARTICLE VI

LIQUIDITY EVENTS OF DEFAULT AND SPECIAL TERMINATION

Section 6.01 Liquidity Events of Default and Special Termination. (a) If (i) any Liquidity Event of Default has occurred and is continuing and (ii) there is a Performing Note Deficiency, the Liquidity Provider may, in its discretion, deliver to the Borrower a Termination Notice, the effect of which shall be to cause (A) the obligation of the Liquidity Provider to make Advances hereunder to expire on the fifth Business Day after the date on which such Termination Notice is received by the Borrower, (B) the Borrower to promptly request, and the Liquidity Provider to promptly make, a Final Advance in accordance with Section 2.02(d) hereof and Section 3.5(i) of the Intercreditor Agreement, (C) all other outstanding Advances to be automatically converted into Final Advances for purposes of determining the Applicable Liquidity Rate for interest payable thereon, and (D) subject to Sections 2.07 and 2.09 hereof, all Advances (including, without limitation, any Provider Advance and Applied Provider Advance), any accrued interest thereon and any other amounts outstanding hereunder to become immediately due and payable to the Liquidity Provider.

(b) If the aggregate Pool Balance of the Class A Certificates is greater than the aggregate outstanding principal amount of the Series A Equipment Notes (other than any Series A Equipment Notes previously sold or with respect to which the collateral securing such Series A Equipment Notes has been disposed of) at any time during the 18-month period prior to July 2, 2022 the Liquidity Provider may, in its discretion, deliver to the Borrower a Special Termination Notice, the effect of which shall be to cause (i) the obligation of the Liquidity Provider to make Advances hereunder to expire on the fifth Business Day after the date on which such Special Termination Notice is received by the Borrower, (ii) the Borrower to promptly request, and the Liquidity Provider to promptly make, a Special Termination Advance in accordance with Section 2.02(g) and Section 3.5(k) of the Intercreditor Agreement, and (iii) subject to Sections 2.07 and 2.09, all Advances (including, without limitation, any Provider Advance and Applied Provider Advance), any accrued interest thereon and any other amounts outstanding hereunder to become immediately due and payable to the Liquidity Provider.

[Revolving Credit Agreement (2007-1A)]

ARTICLE VII

MISCELLANEOUS

Section 7.01 Amendments, Etc. No amendment or waiver of any provision of this Agreement, nor consent to any departure by the Borrower therefrom, shall in any event be effective unless the same shall be in writing and signed by the Liquidity Provider, and, in the case of an amendment or of a waiver by the Borrower, the Borrower, and then such waiver or consent shall be effective only in the specific instance and for the specific purpose for which given.

Section 7.02 Notices, Etc. Except as otherwise expressly provided herein, all notices and other communications provided for hereunder shall be in writing (including telecopier and mailed or delivered or sent by telecopier) addressed to the applicable party at its address set forth below:

Borrower:

Wilmington Trust Company

Rodney Square North

1100 North Market Street

Wilmington, DE 19890-0001

Attention: Corporate Trust Administration

Telephone: (800) 733-8485

Fax: (302) 651-8882

with a copy to:

United Air Lines, Inc.

77 West Wacker Drive

Chicago, IL 60601

Attention: Stephen R. Lieberman, Vice President & Treasurer

E-Mail: stephen.lieberman@united.com

Telephone: (312) 997-8000

Facsimile: (312) 997-8333; and

Paul R. Lovejoy, Senior Vice President, General Counsel and Secretary

E-Mail:paul.lovejoy@united.com,

Telephone: (312) 997-8000

Facsimile: (312) 997-8333

[Revolving Credit Agreement (2007-1A)]

Liquidity Provider:

Morgan Stanley Senior Funding, Inc.

1585 Broadway, 3rd Floor

New York, New York 10036

Attention: FID Collateral Manager

Telephone: (212) 761-0877

Fax: (212) 507-4949

with a copy to:

Morgan Stanley

1585 Broadway, 38^th Floor

New York, NY 10036

Attention: Chief Legal Officer

Fax: (212) 507-4622

or to such other address as shall be designated by such Person in a written notice to the others. All such notices and communications shall be effective (i) if given by telecopier, when transmitted to the telecopier number specified above with receipt confirmed electronically, and received in legible form, (ii) if given by mail, five Business Days after being deposited in the mails addressed as specified above, and (iii) if given by other means, when delivered at the address specified above, except that written notices to the Liquidity Provider pursuant to the provisions of Article II and Article III hereof shall not be effective until received by the Liquidity Provider.

Section 7.03 No Waiver; Remedies. No failure on the part of the Liquidity Provider to exercise, and no delay in exercising, any right under this Agreement shall operate as a waiver thereof; nor shall any single or partial exercise of any right under this Agreement preclude any other or further exercise thereof or the exercise of any other right. The remedies herein provided are cumulative and not exclusive of any remedies provided by law.

Section 7.04 Further Assurances. The Borrower agrees to do such further acts and things and to execute and deliver to the Liquidity Provider such additional assignments, agreements, powers and instruments as the Liquidity Provider may reasonably require or deem advisable to carry into effect the purposes of this Agreement and the other Operative Agreements or to better assure and confirm unto the Liquidity Provider its rights, powers and remedies hereunder and under the other Operative Agreements.

Section 7.05 Indemnification; Survival of Certain Provisions. The Liquidity Provider shall be indemnified hereunder to the extent and in the manner described in Section 7.1 of the Participation Agreements. In addition, the Borrower agrees to indemnify, protect, defend and hold harmless the Liquidity Provider from, against and in respect of, and shall pay on demand, all Expenses of any kind or nature whatsoever (other than any Expenses of the nature described in Section 3.01, 3.02 or 7.07 hereof or in the Fee Letter applicable to this Agreement (regardless of whether indemnified against pursuant to said Sections or in such Fee Letter)), that may be imposed on, incurred by or asserted against any Liquidity Indemnitee, in any way relating to,

[Revolving Credit Agreement (2007-1A)]

resulting from, or arising out of or in connection with any action, suit or proceeding by any third party against such Liquidity Indemnitee and relating to this Agreement, the Fee Letter, the Intercreditor Agreement or any Participation Agreement; provided, however, that the Borrower shall not be required to indemnify, protect, defend and hold harmless any Liquidity Indemnitee in respect of any Expense of such Liquidity Indemnitee to the extent such Expense is (i) attributable to the gross negligence or willful misconduct of such Liquidity Indemnitee or any other Liquidity Indemnitee, (ii) ordinary and usual operating overhead expense, (iii) attributable to the failure by such Liquidity Indemnitee or any other Liquidity Indemnitee to perform or observe any agreement, covenant or condition on its part to be performed or observed in this Agreement, the Intercreditor Agreement, the Fee Letter applicable to this Agreement or any other Operative Agreement to which it is a party; or (iv) a Tax. The indemnities contained in Section 7.1 of the Participation Agreements, and the provisions of Sections 3.01, 3.02, 3.03, 3.09, 7.05 and 7.07 hereof, shall survive the termination of this Agreement.

Section 7.06 Liability of the Liquidity Provider. (a) Neither the Liquidity Provider nor any of its officers, employees, directors or Affiliates shall be liable or responsible for: (i) the use which may be made of the Advances or any acts or omissions of the Borrower or any beneficiary or transferee in connection therewith; (ii) the validity, sufficiency or genuineness of documents, or of any endorsement thereon, even if such documents should prove to be in any or all respects invalid, insufficient, fraudulent or forged; or (iii) the making of Advances by the Liquidity Provider against delivery of a Notice of Borrowing and other documents which do not comply with the terms hereof; provided, however, that the Borrower shall have a claim against the Liquidity Provider, and the Liquidity Provider shall be liable to the Borrower, to the extent of any damages suffered by the Borrower which were the result of (A) the Liquidity Provider’s willful misconduct or negligence in determining whether documents presented hereunder comply with the terms hereof, or (B) any breach by the Liquidity Provider of any of the terms of this Agreement or the Intercreditor Agreement, including, but not limited to, the Liquidity Provider’s failure to make lawful payment hereunder after the delivery to it by the Borrower of a Notice of Borrowing strictly complying with the terms and conditions hereof. In no event, however, shall the Liquidity Provider be liable on any theory of liability for any special, indirect, consequential or punitive damages (including, without limitation, any loss of profits, business or anticipated savings).

(b) Neither the Liquidity Provider nor any of its officers, employees, directors or Affiliates shall be liable or responsible in any respect for (i) any error, omission, interruption or delay in transmission, dispatch or delivery of any message or advice, however transmitted, in connection with this Agreement or any Notice of Borrowing delivered hereunder, or (ii) any action, inaction or omission which may be taken by it in good faith, absent willful misconduct or gross negligence (in which event the extent of the Liquidity Provider’s potential liability to the Borrower shall be limited as set forth in the immediately preceding paragraph), in connection with this Agreement or any Notice of Borrowing.

Section 7.07 Costs, Expenses and Taxes. The Borrower agrees to pay, or cause to be paid (A) on the Effective Date and on such later date or dates on which the Liquidity Provider shall make demand, all reasonable out-of-pocket costs and expenses (including, without limitation, the reasonable fees and expenses of outside counsel for the Liquidity Provider) of the Liquidity Provider in connection with the preparation, negotiation, execution, delivery, filing and

[Revolving Credit Agreement (2007-1A)]

recording of this Agreement, any other Operative Agreement and any other documents which may be delivered in connection with this Agreement and (B) on demand, all reasonable costs and expenses (including reasonable counsel fees and expenses) of the Liquidity Provider in connection with (i) the enforcement of this Agreement or any other Operative Agreement, (ii) the modification or amendment of, or supplement to, this Agreement or any other Operative Agreement or such other documents which may be delivered in connection herewith or therewith (whether or not the same shall become effective) or any waiver or consent thereunder (whether or not the same shall become effective) or (iii) any action or proceeding relating to any order, injunction, or other process or decree restraining or seeking to restrain the Liquidity Provider from paying any amount under this Agreement, the Intercreditor Agreement or any other Operative Agreement or otherwise affecting the application of funds in the Class A Cash Collateral Account. In addition, the Borrower shall pay any and all recording, stamp and other similar taxes and fees payable or determined to be payable in connection with the execution, delivery, filing and recording of this Agreement, any other Operative Agreement and such other documents, and agrees to hold the Liquidity Provider harmless from and against any and all liabilities with respect to or resulting from any delay in paying or omission to pay such taxes or fees.

Section 7.08 Binding Effect; Participations. (a) This Agreement shall be binding upon and inure to the benefit of the Borrower and the Liquidity Provider and their respective successors and assigns, except that neither the Liquidity Provider (except as otherwise provided in this Section 7.08 and in Section 3.5(l) of the Intercreditor Agreement) nor (except as contemplated by Section 3.08) the Borrower shall have the right to assign its rights or obligations hereunder or any interest herein without the prior written consent of the other party, subject to the requirements of Section 7.08(b). The Liquidity Provider may grant participations herein or in any of its rights hereunder (including, without limitation, funded participations and participations in rights to receive interest payments hereunder) and under the other Operative Agreements to such Persons (other than United and its Affiliates) as the Liquidity Provider may in its sole discretion select, subject to the requirements of Section 7.08(b). No such granting of participations by the Liquidity Provider, however, will relieve the Liquidity Provider of its obligations hereunder. In connection with any participation or any proposed participation, the Liquidity Provider may disclose to the participant or the proposed participant any information that the Borrower is required to deliver or to disclose to the Liquidity Provider pursuant to this Agreement. The Borrower acknowledges and agrees that the Liquidity Provider’s source of funds may derive in part from its participants. Accordingly, references in this Agreement and the other Operative Agreements to determinations, reserve and capital adequacy requirements, increased costs, reduced receipts, additional amounts due pursuant to Section 3.03 and the like as they pertain to the Liquidity Provider shall be deemed also to include those of each of its participants that are banks (subject, in each case, to the maximum amount that would have been incurred by or attributable to the Liquidity Provider directly if the Liquidity Provider, rather than the participant, had held the interest participated).

(b) If, pursuant to subsection (a) above, the Liquidity Provider sells any participation in this Agreement to any bank or other entity (each, a “Transferee”), the Transferee shall not be entitled to receive any greater payment under Section 3.03 than the Liquidity Provider would have been entitled to receive with respect to the participation sold to such Transferee. A Transferee shall not be entitled to the benefits of Section 3.03 unless the Borrower is notified of

[Revolving Credit Agreement (2007-1A)]

the participation sold to such Transferee and such Transferee agrees, for the benefit of the Borrower, to comply with the certification requirements of Section 3.03 as though it were the Liquidity Provider. Unless the Borrower has received forms or other documents reasonably satisfactory to it (and required by applicable law) indicating that payments hereunder are not subject to United States federal withholding tax, the Borrower will withhold taxes as required by law from such payments at the applicable statutory rate.

(c) Notwithstanding the other provisions of this Section 7.08, the Liquidity Provider may assign and pledge all or any portion of the Advances owing to it to any Federal Reserve Bank or the United States Treasury as collateral security pursuant to Regulation A of the Board of Governors of the Federal Reserve System and any Operating Circular issued by such Federal Reserve Bank, provided that any payment in respect of such assigned Advances made by the Borrower to the Liquidity Provider in accordance with the terms of this Agreement shall satisfy the Borrower’s obligations hereunder in respect of such assigned Advance to the extent of such payment. No such assignment shall release the Liquidity Provider from its obligations hereunder.

Section 7.09 Severability. Any provision of this Agreement which is prohibited, unenforceable or not authorized in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition, unenforceability or non-authorization without invalidating the remaining provisions hereof or affecting the validity, enforceability or legality of such provision in any other jurisdiction.

Section 7.10 GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK (WITHOUT REGARD TO PRINCIPLES OF CONFLICTS OF LAW THEREOF (OTHER THAN SECTIONS 5-1401 AND 5-1402 OF THE NEW YORK GENERAL OBLIGATIONS LAW)).

Section 7.11 Submission to Jurisdiction; Waiver of Jury Trial; Waiver of Immunity. (a) Each of the parties hereto hereby irrevocably and unconditionally:

(i) submits for itself and its property in any legal action or proceeding relating to this Agreement or any other Operative Agreement, or for recognition and enforcement of any judgment in respect hereof or thereof, to the nonexclusive general jurisdiction of the courts of the State of New York, the courts of the United States of America for the Southern District of New York, and the appellate courts from any thereof;

(ii) consents that any such action or proceeding may be brought in such courts, and waives any objection that it may now or hereafter have to the venue of any such action or proceeding in any such court or that such action or proceeding was brought in an inconvenient court and agrees not to plead or claim the same;

(iii) agrees that service of process in any such action or proceeding may be effected by mailing a copy thereof by registered or certified mail (or any substantially similar form of mail), postage prepaid, to each party hereto at its address set forth in Section 7.02 hereof, or at such other address of which the Liquidity Provider shall have been notified pursuant thereto; and

[Revolving Credit Agreement (2007-1A)]

(iv) agrees that nothing herein shall affect the right to effect service of process in any other manner permitted by law or shall limit the right to sue in any other jurisdiction.

(b) THE BORROWER AND THE LIQUIDITY PROVIDER EACH HEREBY AGREE TO WAIVE THEIR RESPECTIVE RIGHTS TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF THIS AGREEMENT OR ANY DEALINGS BETWEEN THEM RELATING TO THE SUBJECT MATTER OF THIS AGREEMENT AND THE RELATIONSHIP THAT IS BEING ESTABLISHED, including, without limitation, contract claims, tort claims, breach of duty claims and all other common law and statutory claims. The Borrower and the Liquidity Provider each warrant and represent that it has reviewed this waiver with its legal counsel, and that it knowingly and voluntarily waives its jury trial rights following consultation with such legal counsel. THIS WAIVER IS IRREVOCABLE, AND CANNOT BE MODIFIED EITHER ORALLY OR IN WRITING, AND THIS WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS, RENEWALS, SUPPLEMENTS OR MODIFICATIONS TO THIS AGREEMENT.

Section 7.12 Execution in Counterparts. This Agreement may be executed in any number of counterparts and by different parties hereto on separate counterparts, each of which counterparts, when so executed and delivered, shall be deemed to be an original and all of which counterparts, taken together, shall constitute but one and the same Agreement.

Section 7.13 Entirety. This Agreement, the Intercreditor Agreement and the other Operative Agreements to which the Liquidity Provider is a party constitute the entire agreement of the parties hereto with respect to the subject matter hereof and supersedes all prior understandings and agreements of such parties.

Section 7.14 Headings. Section headings in this Agreement are included herein for convenience of reference only and shall not constitute a part of this Agreement for any other purpose.

Section 7.15 LIQUIDITY PROVIDER’S OBLIGATION TO MAKE ADVANCES. EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, THE OBLIGATIONS OF THE LIQUIDITY PROVIDER TO MAKE ADVANCES HEREUNDER, AND THE BORROWER’S RIGHTS TO DELIVER NOTICES OF BORROWING REQUESTING THE MAKING OF ADVANCES HEREUNDER, SHALL BE UNCONDITIONAL AND IRREVOCABLE, AND SHALL BE PAID OR PERFORMED, IN EACH CASE STRICTLY IN ACCORDANCE WITH THE TERMS OF THIS AGREEMENT.

Section 7.16 Patriot Act. The Liquidity Provider hereby notifies the Borrower that pursuant to the requirements of the USA PATRIOT Act (Title III of Pub. L. 107-56 (signed into law October 26, 2001)) (the “Act”), the Liquidity Provider is required to obtain, verify and record, and the Borrower shall provide to the Liquidity Provider upon request, information that identifies the Borrower, which information includes the name and address of the Borrower and other information that will allow the Liquidity Provider to identify the Borrower in accordance with the Act.

[Revolving Credit Agreement (2007-1A)]

IN WITNESS WHEREOF, the parties have caused this Agreement to be duly executed and delivered by their respective officers thereunto duly authorized as of the date first set forth above.


WILMINGTON TRUST COMPANY, not in its individual capacity but solely as Subordination Agent, as agent and trustee for the Class A Trust,
as Borrower

By:		/s/ W. Chris Sponenberg
Name:		W. Chris Sponenberg
Title:		Vice President

MORGAN STANLEY SENIOR FUNDING, INC., as Liquidity Provider

By:		/s/ Keith Amburgey
Name:		Keith Amburgey
Title:		Vice President

By:		/s/ Keith Amburgey
Name:		Keith Amburgey
Title:		Vice President

[Revolving Credit Agreement (2007-1A)]

ANNEX I

REVOLVING CREDIT AGREEMENT

INTEREST ADVANCE NOTICE OF BORROWING

The undersigned, a duly authorized signatory of the undersigned borrower (the “Borrower”), hereby certifies to Morgan Stanley Senior Funding, Inc. (the “Liquidity Provider”), with reference to the Revolving Credit Agreement (2007-1A) dated as of June 26, 2007, between the Borrower and the Liquidity Provider (the “Liquidity Agreement”; the terms defined therein and not otherwise defined herein being used herein as therein defined or referenced), that:

(1) The Borrower is the Subordination Agent under the Intercreditor Agreement.

(2) The Borrower is delivering this Notice of Borrowing for the making of an Interest Advance by the Liquidity Provider to be used, subject to clause (3)(v) below, for the payment of interest on the Class A Certificates which was payable on , (the “Distribution Date”) in accordance with the terms and provisions of the Class A Trust Agreement and the Class A Certificates, which Advance is requested to be made on , . The Interest Advance should be transferred to [name of bank/wire instructions/ABA number] in favor of account number [ ], reference [ ].

(3) The amount of the Interest Advance requested hereby (i) is $[ ], to be applied in respect of the payment of the interest which was due and payable on the Class A Certificates on the Distribution Date, (ii) does not include any amount with respect to the payment of principal of, or premium on, the Class A Certificates, or principal of, or interest or premium on, the Class B Certificates and the Class C Certificates, (iii) was computed in accordance with the provisions of the Class A Certificates, the Liquidity Agreement, the Class A Trust Agreement and the Intercreditor Agreement (a copy of which computation is attached hereto as Schedule I), (iv) does not exceed the Maximum Available Commitment on the date hereof, and (v) has not been and is not the subject of a prior or contemporaneous Notice of Borrowing.

(4) Upon receipt by or on behalf of the Borrower of the amount requested hereby, (a) the Borrower will apply the same in accordance with the terms of Section 3.5(b) of the Intercreditor Agreement, (b) no portion of such amount shall be applied by the Borrower for any other purpose and (c) no portion of such amount until so applied shall be commingled with other funds held by the Borrower.

The Borrower hereby acknowledges that, pursuant to the Liquidity Agreement, the making of the Interest Advance as requested by this Notice of Borrowing shall automatically reduce, subject to reinstatement in accordance with the terms of the Liquidity Agreement, the Maximum Available Commitment by an amount equal to the amount of the Interest Advance requested to be made hereby as set forth in clause (i) of paragraph (3) of this Notice of Borrowing and such reduction shall automatically result in corresponding reductions in the amounts available to be borrowed pursuant to a subsequent Advance.

ANNEX I

Page 1

[Revolving Credit Agreement (2007-1A)]

IN WITNESS WHEREOF, the Borrower has executed and delivered this Notice of Borrowing as of the day of , .


WILMINGTON TRUST COMPANY, not in its individual capacity but solely as Subordination Agent, as Agent and Trustee for the United Air Lines Pass Through Trust 2007-1A, as Borrower

By:
Name:
Title:

ANNEX I

Page 2

[Revolving Credit Agreement (2007-1A)]

SCHEDULE I

INTEREST ADVANCE NOTICE OF BORROWING

[Insert copy of computations in accordance with Interest Advance Notice of Borrowing]

ANNEX I

Page 3

[Revolving Credit Agreement (2007-1A)]

ANNEX II

REVOLVING CREDIT AGREEMENT

NON-EXTENSION ADVANCE NOTICE OF BORROWING

(1) The Borrower is the Subordination Agent under the Intercreditor Agreement.

(2) The Borrower is delivering this Notice of Borrowing for the making of the Non-Extension Advance by the Liquidity Provider to be used for the funding of the Class A Cash Collateral Account in accordance with Section 3.5(d) of the Intercreditor Agreement, which Advance is requested to be made on , . The Non-Extension Advance should be transferred to [name of bank/wire instructions/ABA number] in favor of account number [ ], reference [ ].

(3) The amount of the Non-Extension Advance requested hereby (i) is $ . , which equals the Maximum Available Commitment on the date hereof and is to be applied in respect of the funding of the Class A Cash Collateral Account in accordance with Section 3.5(d) of the Intercreditor Agreement, (ii) does not include any amount with respect to the payment of the principal of, or premium on, the Class A Certificates, or principal of, or interest or premium on, the Class B Certificates or the Class C Certificates, (iii) was computed in accordance with the provisions of the Class A Certificates, the Liquidity Agreement, the Class A Trust Agreement and the Intercreditor Agreement (a copy of which computation is attached hereto as Schedule I), and (iv) has not been and is not the subject of a prior or contemporaneous Notice of Borrowing under the Liquidity Agreement.

(4) Upon receipt by or on behalf of the Borrower of the amount requested hereby, (a) the Borrower will deposit such amount in the Class A Cash Collateral Account and apply the same in accordance with the terms of Section 3.5(d) of the Intercreditor Agreement, (b) no portion of such amount shall be applied by the Borrower for any other purpose and (c) no portion of such amount until so applied shall be commingled with other funds held by the Borrower.

The Borrower hereby acknowledges that, pursuant to the Liquidity Agreement, (A) the making of the Non-Extension Advance as requested by this Notice of Borrowing shall automatically and irrevocably terminate the obligation of the Liquidity Provider to make further Advances under the Liquidity Agreement; and (B) following the making by the Liquidity Provider of the Non-Extension Advance requested by this Notice of Borrowing, the Borrower shall not be entitled to request any further Advances under the Liquidity Agreement.

ANNEX II

Page 1

[Revolving Credit Agreement (2007-1A)]

IN WITNESS WHEREOF, the Borrower has executed and delivered this Notice of Borrowing as of the day of , .


WILMINGTON TRUST COMPANY, not in its individual capacity but solely as Subordination Agent, as Agent and Trustee for the United Air Lines Pass Through Trust 2007-1A, as Borrower

By:
Name:
Title:

ANNEX II

Page 2

[Revolving Credit Agreement (2007-1A)]

SCHEDULE I

NON-EXTENSION ADVANCE NOTICE OF BORROWING

[Insert copy of computations in accordance with Non-Extension Advance Notice of Borrowing]

ANNEX II

Page 3

[Revolving Credit Agreement (2007-1A)]

ANNEX III

REVOLVING CREDIT AGREEMENT

DOWNGRADE ADVANCE NOTICE OF BORROWING

The undersigned, a duly authorized signatory of the undersigned borrower (the “Borrower”), hereby certifies to MORGAN STANLEY SENIOR FUNDING, INC. (the “Liquidity Provider”), with reference to the REVOLVING CREDIT AGREEMENT (2007-1A) dated as of June 26, 2007, between the Borrower and the Liquidity Provider (the “Liquidity Agreement”; the terms defined therein and not otherwise defined herein being used herein as therein defined or referenced), that:

(1) The Borrower is the Subordination Agent under the Intercreditor Agreement.

(2) The Borrower is delivering this Notice of Borrowing for the making of the Downgrade Advance by the Liquidity Provider to be used for the funding of the Class A Cash Collateral Account in accordance with Section 3.5(c) of the Intercreditor Agreement by reason of the occurrence of a Downgrade Event, which Advance is requested to be made on , . The Downgrade Advance should be transferred to [name of bank/wire instructions/ABA number] in favor of account number [ ], reference [ ].

(3) The amount of the Downgrade Advance requested hereby (i) is $ . , which equals the Maximum Available Commitment on the date hereof and is to be applied in respect of the funding of the Class A Cash Collateral Account in accordance with Section 3.5(c) of the Intercreditor Agreement, (ii) does not include any amount with respect to the payment of the principal of, or premium on, the Class A Certificates, or principal of, or interest or premium on, the Class B Certificates or the Class C Certificates, (iii) was computed in accordance with the provisions of the Class A Certificates, the Liquidity Agreement, the Class A Trust Agreement and the Intercreditor Agreement (a copy of which computation is attached hereto as Schedule I), and (iv) has not been and is not the subject of a prior or contemporaneous Notice of Borrowing under the Liquidity Agreement.

(4) Upon receipt by or on behalf of the Borrower of the amount requested hereby, (a) the Borrower will deposit such amount in the Class A Cash Collateral Account and apply the same in accordance with the terms of Section 3.5(c) of the Intercreditor Agreement, (b) no portion of such amount shall be applied by the Borrower for any other purpose and (c) no portion of such amount until so applied shall be commingled with other funds held by the Borrower.

The Borrower hereby acknowledges that, pursuant to the Liquidity Agreement, (A) the making of the Downgrade Advance as requested by this Notice of Borrowing shall automatically and irrevocably terminate the obligation of the Liquidity Provider to make further Advances under the Liquidity Agreement; and (B) following the making by the Liquidity Provider of the Downgrade Advance requested by this Notice of Borrowing, the Borrower shall not be entitled to request any further Advances under the Liquidity Agreement.

ANNEX III

Page 1

[Revolving Credit Agreement (2007-1A)]

IN WITNESS WHEREOF, the Borrower has executed and delivered this Notice of Borrowing as of the day of , .


WILMINGTON TRUST COMPANY, not in its individual capacity but solely as Subordination Agent, as Agent and Trustee for the United Air Lines Pass Through Trust 2007-1A, as Borrower

By:
Name:
Title:

ANNEX III

Page 2

[Revolving Credit Agreement (2007-1A)]

SCHEDULE I

DOWNGRADE ADVANCE NOTICE OF BORROWING

[Insert copy of computations in accordance with Downgrade Advance Notice of Borrowing]

ANNEX III

Page 3

[Revolving Credit Agreement (2007-1A)]

ANNEX IV

REVOLVING CREDIT AGREEMENT

FINAL ADVANCE NOTICE OF BORROWING

(1) The Borrower is the Subordination Agent under the Intercreditor Agreement.

(2) The Borrower is delivering this Notice of Borrowing for the making of the Final Advance by the Liquidity Provider to be used for the funding of the Class A Cash Collateral Account in accordance with Section 3.5(i) of the Intercreditor Agreement by reason of the receipt by the Borrower of a Termination Notice from the Liquidity Provider with respect to the Liquidity Agreement, which Advance is requested to be made on , . The Final Advance should be transferred to [name of bank/wire instructions/ABA number] in favor of account number [ ], reference [ ].

(3) The amount of the Final Advance requested hereby (i) is $ . , which equals the Maximum Available Commitment on the date hereof and is to be applied in respect of the funding of the Class A Cash Collateral Account in accordance with Section 3.5(i) of the Intercreditor Agreement, (ii) does not include any amount with respect to the payment of principal of, or premium on, the Class A Certificates, or principal of, or interest or premium on, the Class B Certificates or the Class C Certificates, (iii) was computed in accordance with the provisions of the Class A Certificates, the Liquidity Agreement, the Class A Trust Agreement and the Intercreditor Agreement (a copy of which computation is attached hereto as Schedule I), and (iv) has not been and is not the subject of a prior or contemporaneous Notice of Borrowing.

(4) Upon receipt by or on behalf of the Borrower of the amount requested hereby, (a) the Borrower will deposit such amount in the Class A Cash Collateral Account and apply the same in accordance with the terms of Section 3.5(i) of the Intercreditor Agreement, (b) no portion of such amount shall be applied by the Borrower for any other purpose and (c) no portion of such amount until so applied shall be commingled with other funds held by the Borrower.

(5) The Borrower hereby requests that the Advance requested hereby be a Base Rate Advance and that such Base Rate Advance be converted into a LIBOR Advance on the third Business Day following your receipt of this notice.

ANNEX IV

Page 1

[Revolving Credit Agreement (2007-1A)]

The Borrower hereby acknowledges that, pursuant to the Liquidity Agreement, (A) the making of the Final Advance as requested by this Notice of Borrowing shall automatically and irrevocably terminate the obligation of the Liquidity Provider to make further Advances under the Liquidity Agreement; and (B) following the making by the Liquidity Provider of the Final Advance requested by this Notice of Borrowing, the Borrower shall not be entitled to request any further Advances under the Liquidity Agreement.

ANNEX IV

Page 2

[Revolving Credit Agreement (2007-1A)]

IN WITNESS WHEREOF, the Borrower has executed and delivered this Notice of Borrowing as of the day of , .


WILMINGTON TRUST COMPANY, not in its individual capacity but solely as Subordination Agent, as Agent and Trustee for the United Air Lines Pass Through Trust 2007-1A, as Borrower

By:
Name:
Title:

ANNEX IV

Page 3

[Revolving Credit Agreement (2007-1A)]

SCHEDULE I

FINAL ADVANCE NOTICE OF BORROWING

[Insert copy of computations in accordance with Final Advance Notice of Borrowing]

ANNEX IV

Page 4

[Revolving Credit Agreement (2007-1A)]

ANNEX V

REVOLVING CREDIT AGREEMENT

NOTICE OF TERMINATION

[Date]

Wilmington Trust Company,

as Subordination Agent, as Borrower

Rodney Square North

1100 North Market Square

Wilmington, DE 19890-0001

Attention: Corporate Trust Administration

Revolving Credit Agreement dated as of June 26, 2007 between Wilmington Trust Company, as Subordination Agent, as agent and trustee for the United Air Lines Pass Through Trust, 2007-1A, as Borrower, and Morgan Stanley Senior Funding, Inc. (the “Liquidity Agreement”)

Ladies and Gentlemen:

You are hereby notified that pursuant to Section 6.01(a) of the Liquidity Agreement, by reason of the occurrence of a Liquidity Event of Default and the existence of a Performing Note Deficiency (each as defined therein), we are giving this notice to you in order to cause (i) our obligations to make Advances (as defined therein) under such Liquidity Agreement to terminate on the fifth Business Day after the date on which you receive this notice and (ii) you to request a Final Advance under the Liquidity Agreement pursuant to Section 3.5(i) of the Intercreditor Agreement (as defined in the Liquidity Agreement) as a consequence of your receipt of this notice.

ANNEX V

Page 1

[Revolving Credit Agreement (2007-1A)]

THIS NOTICE IS THE “NOTICE OF TERMINATION” PROVIDED FOR UNDER THE LIQUIDITY AGREEMENT. OUR OBLIGATIONS TO MAKE ADVANCES UNDER THE LIQUIDITY AGREEMENT WILL TERMINATE ON THE FIFTH BUSINESS DAY AFTER THE DATE ON WHICH YOU RECEIVE THIS NOTICE.


Very truly yours,

MORGAN STANLEY SENIOR FUNDING, INC., as Liquidity Provider

By:
Name:
Title:

By:
Name:
Title:

cc: Wilmington Trust Company,

as Class A Trustee

ANNEX V

Page 2

[Revolving Credit Agreement (2007-1A)]

ANNEX VI

REVOLVING CREDIT AGREEMENT

NOTICE OF REPLACEMENT SUBORDINATION AGENT

[Date]

Attention:

Revolving Credit Agreement dated as of June 26, 2007, between Wilmington Trust Company, as Subordination Agent, as agent and trustee for the United Air Lines Pass Through Trust, 2007-1A, as Borrower, and Morgan Stanley Senior Funding, Inc. (the “Liquidity Agreement”)

Ladies and Gentlemen:

For value received, the undersigned beneficiary hereby irrevocably transfers to:

[Name of Transferee]

[Address of Transferee]

all rights and obligations of the undersigned as Borrower under the Liquidity Agreement referred to above. The transferee has succeeded the undersigned as Subordination Agent under the Intercreditor Agreement referred to in the first paragraph of the Liquidity Agreement, pursuant to the terms of Section 8.1 of the Intercreditor Agreement.

By this transfer, all rights of the undersigned as Borrower under the Liquidity Agreement are transferred to the transferee and the transferee shall hereafter have the sole rights and obligations as Borrower thereunder. The undersigned shall pay any costs and expenses of such transfer, including, but not limited to, transfer taxes or governmental charges.

We ask that this transfer be effective as of , .


WILMINGTON TRUST COMPANY, not in its individual capacity but solely as Subordination Agent, as Agent and Trustee for the United Air Lines Pass Through Trust 2007-1A, as Borrower

By:
Name:
Title:

ANNEX VI

Page 1

[Revolving Credit Agreement (2007-1A)]

ANNEX VII TO

REVOLVING CREDIT AGREEMENT

SPECIAL TERMINATION ADVANCE NOTICE OF BORROWING

The undersigned, a duly authorized signatory of the undersigned borrower (the “Borrower”), hereby certifies to MORGAN STANLEY SENIOR FUNDING, INC. (the “Liquidity Provider”), with reference to the Revolving Credit Agreement, dated as of June 26, 2007, between the Borrower and the Liquidity Provider (the “Liquidity Agreement”); the terms defined therein and not otherwise defined herein being used herein as therein defined or referenced), that:

(1) The Borrower is the Subordination Agent under the Intercreditor Agreement.

(2) The Borrower is delivering this Notice of Borrowing for the making of the Special Termination Advance by the Liquidity Provider to be used for the funding of the Class A Cash Collateral Account in accordance with Section 3.5(k) of the Intercreditor Agreement by reason of the receipt by the Borrower of a Special Termination Notice from the Liquidity Provider with respect to the Liquidity Agreement, which Advance is requested to be made on .

(3) The amount of the Special Termination Advance requested hereby (i) is $ , which equals the Maximum Available Commitment on the date hereof and is to be applied in respect of the funding of the Class A Cash Collateral Account in accordance with Section 3.5(k) of the Intercreditor Agreement, (ii) does not include any amount with respect to the payment of principal of, or premium on, the Class A Certificates, the Class B Certificates or the Class C Certificates, or interest on the Class B Certificates or the Class C Certificates, (iii) was computed in accordance with the provisions of the Class A Certificates, the Class A Trust Agreement and the Intercreditor Agreement (a copy of which computation is attached hereto as Schedule I), and (iv) has not been and is not the subject of a prior or contemporaneous Notice of Borrowing.

(4) Upon receipt by or on behalf of the Borrower of the amount requested hereby, (a) the Borrower shall deposit such amount in the Class A Cash Collateral Account and apply the same in accordance with the terms of Section 3.5(k) of the Intercreditor Agreement, (b) no portion of such amount shall be applied by the Borrower for any other purpose and (c) no portion of such amount until so applied shall be commingled with other funds held by the Borrower.

The Borrower hereby acknowledges that, pursuant to the Liquidity Agreement, (A) the making of the Special Termination Advance as requested by this Notice of Borrowing shall automatically and irrevocably terminate the obligation of the Liquidity Provider to make further Advances under the Liquidity Agreement; and (B) following the making by the Liquidity Provider of the Special Termination Advance requested by this Notice of Borrowing, the Borrower shall not be entitled to request any further Advances under the Liquidity Agreement.

ANNEX VII

Page 1

[Revolving Credit Agreement (2007-1A)]

IN WITNESS WHEREOF, the Borrower has executed and delivered this Notice of Borrowing as of the day of , .


WILMINGTON TRUST COMPANY, not in its individual capacity but solely as Subordination Agent, as Agent and Trustee for the United Air Lines Pass Through Trust 2007-1A, as Borrower

By:
Name:
Title:

ANNEX VII

Page 2

[Revolving Credit Agreement (2007-1A)]

SCHEDULE I TO SPECIAL TERMINATION ADVANCE NOTICE OF BORROWING

[Insert Copy of Computations in accordance with

Special Termination Advance Notice of Borrowing]

ANNEX VII

Page 1

[Revolving Credit Agreement (2007-1A)]

ANNEX VIII TO

REVOLVING CREDIT AGREEMENT

NOTICE OF SPECIAL TERMINATION

[Date]

Wilmington Trust Company

Rodney Square North

1100 North Market Square

Wilmington, DE 19890-0001

Attention: Corporate Trust Administration


Re:		Revolving Credit Agreement, dated as of June 26, 2007, between Wilmington Trust Company, as Subordination Agent, as agent and trustee for the United Airlines 2007-1A Pass Through Trust, as Borrower, and Morgan Stanley Senior Funding, Inc. (the “Primary Liquidity Agreement”)

Ladies and Gentlemen:

You are hereby notified that pursuant to Section 6.01(b) of the Liquidity Agreement, by reason of the aggregate Pool Balance of the Class A Certificates exceeding the aggregate outstanding principal amount of the Series A Equipment Notes (other than any Series A Equipment Notes previously sold or with respect to which the collateral securing such Series A Equipment Notes has been disposed of) during the 18-month period prior to July 2, 2022, we are giving this notice to you in order to cause (i) our obligations to make Advances (as defined therein) under such Liquidity Agreement to terminate on the fifth Business Day after the date on which you receive this notice and (ii) you to request a Special Termination Advance under the Liquidity Agreement pursuant to Section 3.5(k) of the Intercreditor Agreement (as defined in the Liquidity Agreement) as a consequence of your receipt of this notice.

ANNEX VIII

Page 1

[Revolving Credit Agreement (2007-1A)]

THIS NOTICE IS THE “NOTICE OF SPECIAL TERMINATION” PROVIDED FOR UNDER THE LIQUIDITY AGREEMENT. OUR OBLIGATIONS TO MAKE ADVANCES UNDER THE LIQUIDITY AGREEMENT SHALL TERMINATE ON THE FIFTH BUSINESS DAY AFTER THE DATE ON WHICH YOU RECEIVE THIS NOTICE.


Very truly yours,

MORGAN STANLEY SENIOR FUNDING, INC. as Liquidity Provider


By:
Name:
Title:

By:
Name:
Title:

cc: Wilmington Trust Company, as Trustee

ANNEX VIII

Page 2

Revolving Credit Agreement (2007-1B), dated as of June 26, 2007

Exhibit 4.9

REVOLVING CREDIT AGREEMENT

(2007-1B)

dated as of June 26, 2007

between

WILMINGTON TRUST COMPANY,

as Subordination Agent,

as Agent and Trustee for the

United Air Lines Pass Through Trust 2007-1B,

as Borrower

and

MORGAN STANLEY SENIOR FUNDING, INC.,

as Liquidity Provider

Relating to United Air Lines

Pass Through Trust 2007-1B

United Air Lines Pass Through Certificates, Series 2007-1B

TABLE OF CONTENTS


			Page
ARTICLE I DEFINITIONS			1

	Section 1.01	Certain !Defined Terms	1

ARTICLE II AMOUNT AND TERMS OF THE COMMITMENT			7

	Section 2.01	The Advances	7
	Section 2.02	Making the Advances	7
	Section 2.03	Fees	9
	Section 2.04	Automatic Reductions and Termination of the Maximum Commitment	9
	Section 2.05	Repayments of Interest Advances , the Special Termination Advance or the Final Advance	10
	Section 2.06	Repayments of Provider Advances	10
	Section 2.07	Payments to the Liquidity Provider Under the Intercreditor Agreement	11
	Section 2.08	Book Entries	12
	Section 2.09	Payments from Available Funds Only	12
	Section 2.10	Extension of the Expiry Date; Non-Extension Advance	12

ARTICLE III OBLIGATIONS OF THE BORROWER			12

	Section 3.01	Increased Costs	12
	Section 3.02	Capital Adequacy	13
	Section 3.03	Payments Free of Deductions	14
	Section 3.04	Payments	15
	Section 3.05	Computations	15
	Section 3.06	Payment on Non-Business Days	15
	Section 3.07	Interest	16
	Section 3.08	Replacement of Borrower	17
	Section 3.09	Funding Loss Indemnification	17
	Section 3.10	Illegality	17

ARTICLE IV CONDITIONS PRECEDENT			18

	Section 4.01	Conditions Precedent to Effectiveness of Section 2.01	18
	Section 4.02	Conditions Precedent to Borrowing	19

TABLE OF CONTENTS

(continued)


			Page
ARTICLE V COVENANTS

	Section 5.01	Affirmative Covenants of the Borrower	19
	Section 5.02	Negative Covenants of the Borrower	20

ARTICLE VI LIQUIDITY EVENTS OF DEFAULT AND SPECIAL TERMINATION			20

	Section 6.01	Liquidity Events of Default and Special Termination	20

ARTICLE VII MISCELLANEOUS			21

	Section 7.01	Amendments, Etc	21
	Section 7.02	Notices, Etc	21
	Section 7.03	No Waiver; Remedies	22
	Section 7.04	Further Assurances	22
	Section 7.05	Indemnification; Survival of Certain Provisions	22
	Section 7.06	Liability of the Liquidity Provider	23
	Section 7.07	Costs, Expenses and Taxes	23
	Section 7.08	Binding Effect; Participations	24
	Section 7.09	Severability	25
	Section 7.10	GOVERNING LAW	25
	Section 7.11	Submission to Jurisdiction; Waiver of Jury Trial; Waiver of Immunity	25
	Section 7.12	Execution in Counterparts	26
	Section 7.13	Entirety	26
	Section 7.14	Headings	26
	Section 7.15	LIQUIDITY PROVIDER’S OBLIGATION TO MAKE ADVANCES	26


Annex I	-	Interest Advance Notice of Borrowing
Annex II	-	Non-Extension Advance Notice of Borrowing
Annex III	-	Downgrade Advance Notice of Borrowing
Annex IV	-	Final Advance Notice of Borrowing
Annex V	-	Notice of Termination
Annex VI	-	Notice of Replacement Subordination Agent
Annex VII	-	Special Termination Advance Notice of Borrowing
Annex VIII	-	Notice of Special Termination

REVOLVING CREDIT AGREEMENT (2007-1B)

THIS REVOLVING CREDIT AGREEMENT (2007-1B) dated as of June 26, 2007 (this “Agreement”), between WILMINGTON TRUST COMPANY, a Delaware banking corporation, not in its individual capacity but solely as Subordination Agent under the Intercreditor Agreement (each as defined below), as agent and trustee for the Class B Trust (as defined below) (the “Borrower”), and MORGAN STANLEY SENIOR FUNDING, INC., a Delaware corporation (the “Liquidity Provider”).

W I T N E S S E T H:

WHEREAS, pursuant to the Class B Trust Agreement (such term and all other capitalized terms used in these recitals having the meanings set forth or referred to in Section 1.01), the Class B Trust is issuing the Class B Certificates;

WHEREAS, the Borrower, in order to support the timely payment of a portion of the interest on the Class B Certificates in accordance with their terms, has requested the Liquidity Provider to enter into this Agreement, providing in part for the Borrower to request in specified circumstances that Advances be made hereunder; and

NOW, THEREFORE, in consideration of the premises, the parties hereto agree as follows:

ARTICLE I

DEFINITIONS

“Additional Costs” has the meaning assigned to such term in Section 3.01.

“Applicable Liquidity Rate” has the meaning assigned to such term in Section 3.07(g).

[Revolving Credit Agreement (2007-1B)]

“Applied Downgrade Advance” has the meaning assigned to such term in Section 2.06(a).

“Applied Non-Extension Advance” has the meaning assigned to such term in Section 2.06(a).

“Applied Provider Advance” has the meaning assigned to such term in Section 2.06(a).

“Applied Special Termination Advance” has the meaning assigned to such term in Section 2.05.

“Base Rate Advance” means an Advance that bears interest at a rate based upon the Base Rate.

“Borrower” has the meaning assigned to such term in the recital of parties to this Agreement.

“Borrowing” means the making of Advances requested by delivery of a Notice of Borrowing.

“Business Day” means any day other than a Saturday or Sunday or a day on which commercial banks are required or authorized to close in Chicago, Illinois, New York, New York or, so long as any Class B Certificate is outstanding, the city and state in which the Class B Trustee, the Borrower or any Loan Trustee maintains its corporate trust office or receives or disburses funds, and, if the applicable Business Day relates to any Advance or other amount bearing interest based on the LIBOR Rate, on which dealings in dollars are carried on in the London interbank market.

“Code” means the Internal Revenue Code of 1986, as amended.

“Downgrade Advance” means an Advance made pursuant to Section 2.02(c).

[Revolving Credit Agreement (2007-1B)]

Agency shall have confirmed in writing on or prior to the date of such downgrading that such downgrading will not result in the downgrading, withdrawal or suspension of the ratings of the Class B Certificates, in which case such downgrading of the Guarantor’s short-term unsecured debt rating or short-term issuer credit rating (as applicable) shall not constitute a Downgrade Event.

[Revolving Credit Agreement (2007-1B)]

“Final Advance” means an Advance made pursuant to Section 2.02(d).

“Guarantee Agreement” has the meaning assigned to such term in the recitals to this Agreement.

“Guarantor” has the meaning assigned to such term in the recitals to this Agreement.

“Indemnified Tax” has the meaning assigned to such term in Section 3.03(a).

“Interest Advance” means an Advance made pursuant to Section 2.02(a).

“Interest Period” means, with respect to any LIBOR Advance, each of the following periods:

(i) the period beginning on the third Business Day following either (x) the date of the Liquidity Provider’s receipt of the Notice of Borrowing for such LIBOR Advance or (y) the date of the withdrawal of funds from the Class B Cash Collateral Account for the purpose of paying interest on the Class B Certificates as contemplated by Section 2.06(a) hereof and, in either case, ending on the next Regular Distribution Date (or, if such day is not a Business Day, the next succeeding Business Day); and

[Revolving Credit Agreement (2007-1B)]

“LIBOR Advance” means an Advance bearing interest at a rate based upon the LIBOR Rate.

“LIBOR Rate” means, with respect to any Interest Period,

“Liquidity Event of Default” means the occurrence of either (a) the Acceleration of all of the Equipment Notes or (b) a United Bankruptcy Event.

“Liquidity Provider” has the meaning assigned to such term in the recital of parties to this Agreement.

“Maximum Commitment” means initially $11,756,123.40, as such amount may be reduced from time to time in accordance with Section 2.04(a).

“Non-Extension Advance” means an Advance made pursuant to Section 2.02(b).

“Notice of Borrowing” has the meaning assigned to such term in Section 2.02(e).

“Notice Date” has the meaning assigned to such term in Section 2.10.

[Revolving Credit Agreement (2007-1B)]

“Notice of Replacement Subordination Agent” has the meaning assigned to such term in Section 3.08.

“Performing Note Deficiency” means any time that less than 65% of the then aggregate outstanding principal amount of all Equipment Notes are Performing Equipment Notes.

“Prospectus Supplement” means the final Prospectus Supplement dated June 19, 2007 relating to the Certificates, as such Prospectus Supplement may be amended or supplemented.

“Provider Advance” means a Downgrade Advance or a Non-Extension Advance.

“Regulatory Change” has the meaning assigned to such term in Section 3.01.

“Replenishment Amount” has the meaning assigned to such term in Section 2.06(b).

“Required Amount” means, for any day, the sum of the aggregate amount of interest, calculated at the rate per annum equal to the Stated Interest Rate for the Class B Certificates, that would be payable on the Class B Certificates on each of the three successive semi-annual Regular Distribution Dates immediately following such day or, if such day is a Regular Distribution Date, on such day and the succeeding two semi-annual Regular Distribution Dates, in each case calculated on the basis of the Pool Balance of the Class B Certificates on such day and without regard to expected future distributions of principal on the Class B Certificates.

“Special Termination Advance” means an Advance made pursuant to Section 2.02(g).

“Special Termination Notice” means the Notice of Termination substantially in the form of Annex VIII to this Agreement.

“Termination Date” means the earliest to occur of the following: (i) the Expiry Date; (ii) the date on which the Borrower delivers to the Liquidity Provider a certificate, signed by a Responsible Officer of the Borrower, certifying that all of the Class B Certificates have been paid in full (or provision has been made for such payment in accordance with the Intercreditor Agreement and the Class B Trust Agreement) or are otherwise no longer entitled to the benefits of this Agreement; (iii) the date on which the Borrower delivers to the Liquidity Provider a certificate, signed by a Responsible Officer of the Borrower, certifying that a Replacement Liquidity Facility has been substituted for this Agreement in full pursuant to Section 3.5(e) of the Intercreditor Agreement; (iv) the fifth Business Day following the receipt by the Borrower of a Termination Notice or Special Termination Notice from the Liquidity Provider pursuant to Section 6.01 hereof; and (v) the date on which no Advance is or may (including by reason of reinstatement as herein provided) become available for a Borrowing hereunder.

“Termination Notice” means the Notice of Termination substantially in the form of Annex V to this Agreement.

“Transferee” has the meaning assigned to such term in Section 7.08(b).

“Unapplied Downgrade Advance” means any Downgrade Advance other than an Applied Downgrade Advance.

[Revolving Credit Agreement (2007-1B)]

“Unapplied Non-Extension Advance” means any Non-Extension Advance other than an Applied Non-Extension Advance.

“Unapplied Provider Advance” means any Provider Advance other than an Applied Provider Advance.

“Unapplied Special Termination Advance” means any Special Termination Advance other than an Applied Special Termination Advance.

“Unpaid Advance” has the meaning assigned to such term in Section 2.05.

(b) Terms Defined in the Intercreditor Agreement. Capitalized terms not otherwise defined in this Agreement shall have the respective meanings assigned to such terms in the Intercreditor Agreement.

ARTICLE II

AMOUNT AND TERMS OF THE COMMITMENT

Section 2.02 Making the Advances. (a) Interest Advances shall be made in one or more Borrowings by delivery to the Liquidity Provider of one or more written and completed Notices of Borrowing in substantially the form of Annex I attached hereto, signed by a Responsible Officer of the Borrower, in an amount not exceeding the Maximum Available Commitment at such time and shall be used solely for the payment when due of interest on the Class B Certificates at the Stated Interest Rate therefor in accordance with Section 3.5(a) of the Intercreditor Agreement. Each Interest Advance made hereunder shall automatically reduce the Maximum Available Commitment and the amount available to be borrowed hereunder by subsequent Advances by the amount of such Interest Advance (subject to reinstatement as provided in the next sentence). Upon repayment to the Liquidity Provider in full or in part of the amount of any Interest Advance made pursuant to this Section 2.02(a), together with accrued interest thereon (as provided herein), the Maximum Available Commitment shall be reinstated by an amount equal to the amount of the Interest Advance so repaid but not to exceed the Maximum Commitment; provided, however, that the Maximum Available Commitment shall not be so reinstated (x) at any time if (i) a Liquidity Event of Default shall have occurred and be continuing and (ii) there is a Performing Note Deficiency or (y) at any time after the making of a Provider Advance, a Final Advance or a Special Termination Advance or after any Interest Advance shall have been converted into a Final Advance.

[Revolving Credit Agreement (2007-1B)]

Borrower as contemplated by said Section 3.5(d) within the time period specified in such Section) by delivery to the Liquidity Provider of a written and completed Notice of Borrowing in substantially the form of Annex II attached hereto, signed by a Responsible Officer of the Borrower, in an amount equal to the Maximum Available Commitment at such time, and shall be used to fund the Class B Cash Collateral Account in accordance with said Section 3.5(d) and Section 3.5(f) of the Intercreditor Agreement.

(c) A Downgrade Advance shall be made in a single Borrowing upon the occurrence of a Downgrade Event (as provided for in Section 3.5(c) of the Intercreditor Agreement) unless a Replacement Liquidity Facility to replace this Agreement shall have been previously delivered to the Borrower in accordance with Section 3.5(c), by delivery to the Liquidity Provider of a written and completed Notice of Borrowing in substantially the form of Annex III attached hereto, signed by a Responsible Officer of the Borrower, in an amount equal to the Maximum Available Commitment at such time, and shall be used solely to fund the Class B Cash Collateral Account in accordance with said Section 3.5(c) and Section 3.5(f) of the Intercreditor Agreement.

(d) A Final Advance shall be made in a single Borrowing upon the receipt by the Borrower of a Termination Notice from the Liquidity Provider pursuant to Section 6.01 hereof by delivery to the Liquidity Provider of a written and completed Notice of Borrowing in substantially the form of Annex IV attached hereto, signed by a Responsible Officer of the Borrower, in an amount equal to the Maximum Available Commitment at such time, and shall be used solely to fund the Class B Cash Collateral Account (in accordance with Sections 3.5(f) and 3.5(i) of the Intercreditor Agreement).

[Revolving Credit Agreement (2007-1B)]

(f) Upon the making of any Advance requested pursuant to a Notice of Borrowing, in accordance with the Borrower’s payment instructions, the Liquidity Provider shall be fully discharged of its obligation hereunder with respect to such Notice of Borrowing, and the Liquidity Provider shall not thereafter be obligated to make any further Advances hereunder in respect of such Notice of Borrowing to the Borrower or to any other Person. If the Liquidity Provider makes an Advance requested pursuant to a Notice of Borrowing before 12:00 Noon (New York City time) on the second Business Day after the date of payment specified in Section 2.02(e), the Liquidity Provider shall have fully discharged its obligations hereunder with respect to such Advance and an event of default shall not have occurred hereunder. Following the making of any Advance pursuant to Section 2.02(b), (c), (d) or (g) hereof to fund the Class B Cash Collateral Account, the Liquidity Provider shall have no interest in or rights to the Class B Cash Collateral Account, the funds constituting such Advance or any other amounts from time to time on deposit in the Class B Cash Collateral Account; provided that the foregoing shall not affect or impair the obligations of the Subordination Agent to make the distributions contemplated by Section 3.5(e) or (f) of the Intercreditor Agreement, and provided further, that the foregoing shall not affect or impair the rights of the Liquidity Provider to provide written instructions with respect to the investment and reinvestment of amounts in the Cash Collateral Accounts to the extent provided in Section 2.2(b) of the Intercreditor Agreement. By paying to the Borrower proceeds of Advances requested by the Borrower in accordance with the provisions of this Agreement, the Liquidity Provider makes no representation as to, and assumes no responsibility for, the correctness or sufficiency for any purpose of the amount of the Advances so made and requested.

(g) A “Special Termination Advance” shall be made in a single Borrowing upon the receipt by the Borrower of a Special Termination Notice from the Liquidity Provider pursuant to Section 6.01(b), by delivery to the Liquidity Provider of a written and completed Notice of Borrowing in substantially the form of Annex VII, signed by a Responsible Officer of the Borrower, in an amount equal to the Maximum Available Commitment at such time, and shall be used solely to fund the Class B Cash Collateral Account (in accordance with Section 3.5(f) and Section 3.5(k) of the Intercreditor Agreement).

Section 2.03 Fees. The Borrower agrees to pay to the Liquidity Provider the fees set forth in the Fee Letter applicable to this Agreement.

Section 2.04 Automatic Reductions and Termination of the Maximum Commitment.

(a) Automatic Reduction. Promptly following each date on which the Required Amount is reduced as a result of a reduction in the Pool Balance of the Class B Certificates or otherwise, the Maximum Commitment shall automatically be reduced to an amount equal to such reduced Required Amount (as calculated by the Borrower). The Borrower shall give notice of any such automatic reduction of the Maximum Commitment to the Liquidity Provider within two Business Days thereof. The failure by the Borrower to furnish any such notice shall not affect such automatic reduction of the Maximum Commitment.

[Revolving Credit Agreement (2007-1B)]

Section 2.05 Repayments of Interest Advances , the Special Termination Advance or the Final Advance. Subject to Sections 2.06, 2.07 and 2.09 hereof, the Borrower hereby agrees, without notice of an Advance or demand for repayment from the Liquidity Provider (which notice and demand are hereby waived by the Borrower), to pay, or to cause to be paid, to the Liquidity Provider on each date on which the Liquidity Provider shall make an Interest Advance, the Special Termination Advance or the Final Advance, an amount equal to (a) the amount of such Advance (any such Advance, until repaid, is referred to herein as an “Unpaid Advance”) (if multiple Interest Advances are outstanding any such repayment to be applied in the order in which such Interest Advances have been made, starting with the earliest), plus (b) interest on the amount of each such Unpaid Advance as provided in Section 3.07 hereof; provided that if (i) the Liquidity Provider shall make a Provider Advance at any time after making one or more Interest Advances which shall not have been repaid in accordance with this Section 2.05 or (ii) this Liquidity Facility shall become a Downgraded Facility or Non-Extended Facility at any time when unreimbursed Interest Advances have reduced the Maximum Available Commitment to zero, then such Interest Advances shall cease to constitute Unpaid Advances and shall be deemed to have been changed into an Applied Downgrade Advance or an Applied Non-Extension Advance, as the case may be, for all purposes of this Agreement (including, without limitation, for the purpose of determining when such Interest Advance is required to be repaid to the Liquidity Provider in accordance with Section 2.06 and for the purposes of Section 2.06(b)); provided, further, that amounts in respect of a Special Termination Advance withdrawn from the Class B Cash Collateral Account for the purpose of paying interest on the Class B Certificates in accordance with Section 3.5(f) of the Intercreditor Agreement (the amount of any such withdrawal being an “Applied Special Termination Advance”) shall thereafter (subject to Section 2.06(b)) be treated as an Interest Advance under this Agreement for purposes of determining the Applicable Liquidity Rate for interest payable thereon; and provided, further, that if, following the making of a Special Termination Advance, the Liquidity Provider delivers a Termination Notice to the Borrower pursuant to Section 6.01(a), such Special Termination Advance shall thereafter be converted to and treated as a Final Advance under this Agreement for purposes of determining the Applicable Liquidity Rate for interest payable thereon and the obligation for repayment thereof and as an Applied Special Termination Advance for purposes of Section 2.6(c) of the Intercreditor Agreement. The Borrower and the Liquidity Provider agree that the repayment in full of each Interest Advance, Special Termination Advance and Final Advance on the date such Advance is made is intended to be a contemporaneous exchange for new value given to the Borrower by the Liquidity Provider.

Section 2.06 Repayments of Provider Advances. (a) Amounts advanced hereunder in respect of a Provider Advance shall be deposited in the Class B Cash Collateral Account, invested and withdrawn from the Class B Cash Collateral Account as set forth in Sections 3.5(c), (d), (e) and (f) of the Intercreditor Agreement. Subject to Sections 2.07 and 2.09, the Borrower agrees to pay to the Liquidity Provider, on each Regular Distribution Date, commencing on the first Regular Distribution Date after the making of a Provider Advance, interest on the principal amount of any such Provider Advance as provided in Section 3.07; provided, however, that amounts in respect of a Provider Advance withdrawn from the Class B Cash Collateral Account for the purpose of paying interest on the Class B Certificates in accordance with Section 3.5(f) of

[Revolving Credit Agreement (2007-1B)]

the Intercreditor Agreement (the amount of any such withdrawal being (y) in the case of a Downgrade Advance, an “Applied Downgrade Advance” and (z) in the case of a Non-Extension Advance, an “Applied Non-Extension Advance” and, together with an Applied Downgrade Advance, an “Applied Provider Advance”) shall thereafter (subject to Section 2.06(b)) be treated as an Interest Advance under this Agreement for purposes of determining the Applicable Liquidity Rate for interest payable thereon and the dates on which such interest is payable; provided further, however, that if, following the making of a Provider Advance, the Liquidity Provider delivers a Termination Notice to the Borrower pursuant to Section 6.01 hereof, such Provider Advance shall thereafter be converted to and treated as a Final Advance under this Agreement for purposes of determining the Applicable Liquidity Rate for interest payable thereon and the obligation for repayment thereof and as an Applied Downgrade Advance or Applied Non-Extension Advance, as the case may be, for the purposes of Section 2.6(c) of the Intercreditor Agreement. Subject to Sections 2.07 and 2.09 hereof, immediately upon the withdrawal of any amounts from the Class B Cash Collateral Account on account of a reduction in the Required Amount, the Borrower shall repay to the Liquidity Provider a portion of the Provider Advances in a principal amount equal to the amount of such reduction, plus interest on the principal amount prepaid as provided in Section 3.07 hereof.

(b) At any time when an Applied Provider Advance (or any portion thereof) is outstanding, upon the deposit in the Class B Cash Collateral Account of any amount pursuant to clause “fourth” of Section 3.2 of the Intercreditor Agreement (any such amount being a “Replenishment Amount”) for the purpose of replenishing or increasing the balance thereof up to the amount of the Required Amount at such time, (i) the aggregate outstanding principal amount of all Applied Provider Advances (and of Provider Advances treated as an Interest Advance for purposes of determining the Applicable Liquidity Rate for interest payable thereon) shall be automatically reduced by the amount of such Replenishment Amount (if multiple Applied Provider Advances are outstanding, such Replenishment Amount to be applied in the order in which such Applied Provider Advances have been made, starting with the earliest) and (ii) the aggregate outstanding principal amount of all Unapplied Provider Advances shall be automatically increased by the amount of such Replenishment Amount.

(c) Upon the provision of a Replacement Liquidity Facility in replacement of this Agreement in accordance with Section 3.5(e) of the Intercreditor Agreement, amounts remaining on deposit in the Class B Cash Collateral Account after giving effect to any Applied Provider Advance or Applied Special Termination Advance on the date of such replacement shall be reimbursed to the replaced Liquidity Provider, but only to the extent such amounts are necessary to repay in full to the replaced Liquidity Provider all amounts owing to it hereunder.

[Revolving Credit Agreement (2007-1B)]

Section 2.09 Payments from Available Funds Only. All payments to be made by the Borrower under this Agreement, including, without limitation, Sections 7.05 and 7.07, shall be made only from the amounts that constitute Scheduled Payments, Special Payments or payments under the Fee Letter and Section 7.1 of the Participation Agreements and only to the extent that the Borrower shall have sufficient income or proceeds therefrom to enable the Borrower to make payments in accordance with the terms hereof after giving effect to the priority of payments provisions set forth in the Intercreditor Agreement. The Liquidity Provider agrees that it will look solely to such amounts in respect of payments to be made by the Borrower hereunder to the extent available for distribution to it as provided in the Intercreditor Agreement and this Agreement and that the Borrower, in its individual capacity, is not personally liable to it for any amounts payable or liability under this Agreement except as expressly provided in this Agreement, the Intercreditor Agreement or any Participation Agreement. Amounts on deposit in the Class B Cash Collateral Account shall be available to the Borrower to make payments under this Agreement only to the extent and for the purposes expressly contemplated in Section 3.5(f) of the Intercreditor Agreement.

ARTICLE III

OBLIGATIONS OF THE BORROWER

[Revolving Credit Agreement (2007-1B)]

The Liquidity Provider will notify the Borrower of any event occurring after the date of this Agreement that will entitle the Liquidity Provider to compensation pursuant to this Section 3.02 as promptly as practicable after it obtains knowledge thereof and determines to request such compensation, which notice shall describe in reasonable detail the calculation of the amounts owed under this Section; provided, that if the Liquidity Provider fails to give such notice within 180 days after it obtains such knowledge, the Liquidity Provider shall, with respect to any costs resulting from such event, only be entitled to payment under this Section 3.02 for costs incurred from and after the date 180 days prior to the date the Liquidity Provider does give such notice. Determinations by the Liquidity Provider for purposes of this Section 3.02 of the effect of any increase in the amount of capital required to be maintained by the Liquidity Provider and of the amount allocable to the Liquidity Provider’s obligations to the Borrower hereunder shall be prima facie evidence of the amounts owed under this Section, absent manifest error.

[Revolving Credit Agreement (2007-1B)]

Section 3.07 Interest. (a) Subject to Section 2.09, the Borrower shall pay, or shall cause to be paid, without duplication, interest on (i) the unpaid principal amount of each Advance from and including the date of such Advance (or, in the case of an Applied Provider Advance or Applied Special Termination Advance, from and including the date on which the amount thereof was withdrawn from the Class B Cash Collateral Account to pay interest on the Class B Certificates) to but excluding the date such principal amount shall be paid in full (or, in the case of an Applied Provider Advance or Applied Special Termination Advance, the date on which the Class B Cash Collateral Account is fully replenished in respect of such Advance) and (ii) any other amount due hereunder (whether fees, commissions, expenses or other amounts or, to the extent permitted by law, installments of interest on Advances or any such other amount) that is not paid when due (whether at stated maturity, by acceleration or otherwise) from and including the due date thereof to but excluding the date such amount is paid in full, in each such case, at a fluctuating interest rate per annum for each day equal to the Applicable Liquidity Rate (as defined below) for such Advance or such other amount, as the case may be, as in effect for such day, but in no event at a rate per annum greater than the maximum rate permitted by applicable law; provided, however, that, if at any time the otherwise applicable interest rate as set forth in this Section 3.07 shall exceed the maximum rate permitted by applicable law, then any subsequent reduction in such interest rate will not reduce the rate of interest payable pursuant to this Section 3.07 below the maximum rate permitted by applicable law until the total amount of interest accrued equals the amount of interest that would have accrued if such otherwise applicable interest rate as set forth in this Section 3.07 had at all times been in effect.

(e) Each outstanding Unapplied Non-Extension Advance, Unapplied Downgrade Advance and Unapplied Special Termination Advance shall bear interest in an amount equal to the Investment Earnings on amounts on deposit in the Class B Cash Collateral Account plus the Applicable Margin for such Unapplied Non-Extension Advance, Unapplied Downgrade Advance

[Revolving Credit Agreement (2007-1B)]

(1) Any repayment of a LIBOR Advance on a date other than the last day of the Interest Period for such Advance; or

(2) Any failure by the Borrower to borrow a LIBOR Advance on the date for borrowing specified in the relevant notice under Section 2.02.

[Revolving Credit Agreement (2007-1B)]

ARTICLE IV

CONDITIONS PRECEDENT

(i) This Agreement duly executed on behalf of the Borrower and the Fee Letter applicable to this Agreement duly executed on behalf of the Borrower;

(ii) The Intercreditor Agreement duly executed on behalf of each of the parties thereto (other than the Liquidity Provider);

(iv) A copy of the Prospectus Supplement and specimen copies of the Class B Certificates;

(v) An executed copy of each document, instrument, certificate and opinion delivered on or before the Closing Date pursuant to the Class B Trust Agreement, the Note Purchase Agreement, the Intercreditor Agreement and the other Operative Agreements (in the case of each such opinion, other than the opinion of counsel for the Underwriters, either addressed to the Liquidity Provider or accompanied by a letter from the counsel rendering such opinion to the effect that the Liquidity Provider is entitled to rely on such opinion as of its date as if it were addressed to the Liquidity Provider);

[Revolving Credit Agreement (2007-1B)]

(c) The Liquidity Provider shall have received payment in full of all fees and other sums required to be paid to or for the account of the Liquidity Provider on or prior to the Effective Date.