View Filing Data

Salaries and related costs

$ 9,589

$ 9,032

^[1]

Operating expense:

2,873

2,726

^[1]

Aircraft fuel

2,023

1,965

^[1]

688

630

^[1]

588

579

^[1]

Aircraft maintenance materials and outside repairs

547

524

^[1]

408

440

^[1]

Distribution expenses

360

342

^[1]

Aircraft rent

127

^[1]

Special charges

^[1]

Other operating expenses

1,508

1,397

^[1]

Total operating expenses

9,094

8,770

^[1]

Operating income

495

262

^[1]

Nonoperating income (expense):

(188)

(162)

^[1]

Total nonoperating expense, net

^[1]

Interest income

^[1]

Miscellaneous, net

^[1]

(128)

(80)

^[1]

Income before income taxes

367

182

^[1]

Income tax expense

^[1]

Earnings per share, basic and diluted (in dollars per share)

$ 292

$ 145

^[1],[2],[3]

$ 1.09

$ 0.51

^[1]

Salaries and related costs

$ 9,589

$ 9,032

^[4]

Operating expense:

2,873

2,726

^[4]

Aircraft fuel

2,023

1,965

^[4]

688

630

^[4]

588

579

^[4]

Aircraft maintenance materials and outside repairs

547

524

^[4]

408

440

^[4]

Distribution expenses

360

342

^[4]

Aircraft rent

127

^[4]

Special charges

^[4]

Other operating expenses

1,507

1,397

^[4]

Total operating expenses

9,093

8,770

^[4]

Operating income

496

262

^[4]

Nonoperating income (expense):

(188)

(162)

^[4]

Total nonoperating expense, net

^[4]

Interest income

^[4]

Miscellaneous, net

^[4]

(128)

(80)

^[4]

Income before income taxes

368

182

^[4]

Income tax expense

^[4]

293

145

^[4],[5],[6]

Passenger revenue

Passenger revenue | United Airlines, Inc.

8,725

8,149

^[1]

8,725

8,149

^[4]

Cargo

Cargo | United Airlines, Inc.

286

293

^[1]

286

293

^[4]

Other operating revenue

Other operating revenue | United Airlines, Inc.

578

590

^[1]

$ 578

$ 590

^[4]

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[3]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[4]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[5]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[6]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.The accompanying Combined Notes to Condensed Consolidated Financial Statements are an integral part of these statements.

Statements of Consolidated Comprehensive Income (Unaudited) - USD ($)
$ in Millions

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Other comprehensive income, net change related to:

$ 292

$ 145

^[1],[2],[3]

Employee benefit plans, net of taxes

^[2]

Investments and other, net of taxes

^[2]

Total other comprehensive income, net

^[2]

Total comprehensive income, net

302

178

^[2]

Other comprehensive income, net change related to:

293

145

^[4],[5],[6]

Employee benefit plans, net of taxes

^[5]

Investments and other, net of taxes

^[5]

Total other comprehensive income, net

^[5]

Total comprehensive income, net

$ 303

$ 178

^[5]

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[3]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[4]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[5]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[6]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.The accompanying Combined Notes to Condensed Consolidated Financial Statements are an integral part of these statements.

Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Millions

Mar. 31, 2019

Dec. 31, 2018

Current assets:

Receivables, less allowance for doubtful accounts (2019 — $8; 2018 — $8)

$ 1,848

$ 1,694

^[1]

Short-term investments

2,219

2,256

^[1]

1,789

1,426

^[1]

Aircraft fuel, spare parts and supplies, less obsolescence allowance (2019 — $421; 2018 — $412)

972

985

^[1]

Other property and equipment

780

733

^[1]

Total current assets

7,608

7,094

^[1]

Operating property and equipment:

Flight equipment

33,705

32,599

^[1]

7,165

6,889

^[1]

Purchase deposits for flight equipment

1,455

1,177

^[1]

Total operating property and equipment, at cost

42,325

40,665

^[1]

Less — Accumulated depreciation and amortization

(13,739)

(13,266)

^[1]

Total operating property and equipment, net

28,586

27,399

^[1]

Intangibles, less accumulated amortization (2019 — $1,395; 2018 — $1,380)

5,065

5,262

^[1]

Other assets:

Goodwill

4,523

^[1]

3,144

3,159

^[1]

Investments in affiliates and other, net

103

105

^[1]

Notes receivable, net

512

516

^[1]

1,098

966

^[1]

Total other assets

9,380

9,269

^[1]

Total assets

50,639

49,024

^[1]

Current liabilities:

Advance ticket sales

6,006

4,381

^[1]

Accounts payable

2,707

2,363

^[1]

Accrued salaries and benefits

2,388

2,286

^[1]

1,660

2,184

^[1]

Current maturities of long-term debt

1,201

1,230

^[1]

133

123

^[1]

639

719

^[1]

Total current liabilities

601

553

^[1]

15,335

13,839

^[1]

Long-term debt

12,734

12,215

^[1]

236

224

^[1]

Other liabilities and deferred credits:

5,145

5,276

^[1]

Postretirement benefit liability

2,750

2,719

^[1]

1,287

1,295

^[1]

Pension liability

1,454

1,576

^[1]

898

828

^[1]

Total other liabilities and deferred credits

998

1,010

^[1]

7,387

7,428

^[1]

Commitments and contingencies

^[1]

Stockholders' equity:

Preferred stock

^[1]

Common stock

^[1]

Additional capital invested

6,080

6,120

^[1]

Stock held in treasury, at cost

6,999

6,715

^[1]

(2,487)

(1,993)

^[1]

Accumulated other comprehensive loss

(793)

(803)

^[1]

Total stockholders' equity

9,802

10,042

^[1],[2]

Total liabilities and stockholders' equity

50,639

49,024

^[1]

Current assets:

Receivables, less allowance for doubtful accounts (2019 — $8; 2018 — $8)

1,842

1,688

^[3]

Short-term investments

2,219

2,256

^[3]

1,789

1,426

^[3]

Aircraft fuel, spare parts and supplies, less obsolescence allowance (2019 — $421; 2018 — $412)

972

985

^[3]

Other property and equipment

780

733

^[3]

Total current assets

7,602

7,088

^[3]

Operating property and equipment:

Flight equipment

33,705

32,599

^[3]

7,165

6,889

^[3]

Purchase deposits for flight equipment

1,455

1,177

^[3]

Total operating property and equipment, at cost

42,325

40,665

^[3]

Less — Accumulated depreciation and amortization

(13,739)

(13,266)

^[3]

Total operating property and equipment, net

28,586

27,399

^[3]

Intangibles, less accumulated amortization (2019 — $1,395; 2018 — $1,380)

5,065

5,262

^[3]

Other assets:

Goodwill

4,523

^[3]

3,144

3,159

^[3]

Investments in affiliates and other, net

103

105

^[3]

Notes receivable, net

512

516

^[3]

1,098

966

^[3]

Total other assets

9,380

9,269

^[3]

Total assets

50,633

49,018

^[3]

Current liabilities:

Advance ticket sales

6,006

4,381

^[3]

Accounts payable

2,707

2,363

^[3]

Accrued salaries and benefits

2,388

2,286

^[3]

1,660

2,184

^[3]

Current maturities of long-term debt

1,201

1,230

^[3]

133

123

^[3]

639

719

^[3]

Total current liabilities

606

558

^[3]

15,340

13,844

^[3]

Long-term debt

12,734

12,215

^[3]

236

224

^[3]

Other liabilities and deferred credits:

5,145

5,276

^[3]

Postretirement benefit liability

2,750

2,719

^[3]

1,287

1,295

^[3]

Pension liability

1,454

1,576

^[3]

925

855

^[3]

Total other liabilities and deferred credits

999

1,010

^[3]

7,415

7,455

^[3]

Commitments and contingencies

^[3]

Stockholders' equity:

Common stock

^[3]

Additional capital invested

598

^[3]

Accumulated other comprehensive loss

10,612

10,319

^[3]

(793)

(803)

^[3]

Receivable from related parties

(140)

(110)

^[3]

Total stockholders' equity

9,763

10,004

^[3],[4]

Total liabilities and stockholders' equity

$ 50,633

$ 49,018

^[3]

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[3]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[4]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.The accompanying Combined Notes to Condensed Consolidated Financial Statements are an integral part of these statements.

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Receivables, allowance for doubtful accounts	$ 8	$ 8
Aircraft fuel, spare parts and supplies, obsolescence allowance	421	412
Intangibles, accumulated amortization	$ 1,395	$ 1,380
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, authorized (in shares)	1,000,000,000	1,000,000,000
Common shares, outstanding (in shares)	264,271,125	269,914,769
United Airlines, Inc.
Receivables, allowance for doubtful accounts	$ 8	$ 8
Aircraft fuel, spare parts and supplies, obsolescence allowance	421	412
Intangibles, accumulated amortization	$ 1,395	$ 1,380
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, authorized (in shares)	1,000	1,000
Common shares, issued (in shares)	1,000	1,000
Common shares, outstanding (in shares)	1,000	1,000

Condensed Statements of Consolidated Cash Flows (Unaudited) - USD ($)
$ in Millions

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

$ 1,915

$ 1,709

^[1]

Purchases of short-term and other investments

(1,609)

(944)

^[1]

(724)

(596)

^[1]

Proceeds from sale of short-term and other investments

768

840

^[1]

Loans made to others

(10)

^[1]

Investment in affiliates

(27)

^[1]

Net cash used in investing activities

^[1]

(1,580)

(695)

^[1]

Payments of long-term debt

646

673

^[1]

(250)

(189)

^[1]

Repurchases of common stock

(513)

(529)

^[1]

Capitalized financing costs

(20)

(18)

^[1]

(17)

(16)

^[1]

Net cash used in financing activities

(29)

(16)

^[1]

(183)

(95)

^[1]

Net increase in cash, cash equivalents and restricted cash

152

919

^[1]

Cash, cash equivalents and restricted cash at beginning of the period

1,799

1,591

^[1]

Cash, cash equivalents and restricted cash at end of the period

^[2]

1,951

2,510

^[1]

Investing and Financing Activities Not Affecting Cash:

Property and equipment acquired through the issuance of debt

^[1]

Operating lease conversions to finance lease

^[1]

Right-of-use assets acquired through operating leases

103

^[1]

Property and equipment acquired through finance leases

^[1]

1,886

1,692

^[3]

Purchases of short-term investments and other investments

(1,609)

(944)

^[3]

(724)

(596)

^[3]

Proceeds from sale of short-term and other investments

768

840

^[3]

Loans made to others

(10)

^[3]

Investment in affiliates

(27)

^[3]

Net cash used in investing activities

^[3]

(1,580)

(695)

^[3]

Payments of long-term debt

646

673

^[3]

Dividend to UAL

(513)

(529)

^[3]

(250)

(189)

^[3]

Capitalized financing costs

(20)

(18)

^[3]

(17)

(16)

^[3]

Net cash used in financing activities

^[3]

(154)

(78)

^[3]

Net increase in cash, cash equivalents and restricted cash

152

919

^[3]

Cash, cash equivalents and restricted cash at beginning of the period

1,793

1,585

^[3]

Cash, cash equivalents and restricted cash at end of the period

^[4]

1,945

2,504

^[3]

Investing and Financing Activities Not Affecting Cash:

Property and equipment acquired through the issuance of debt

^[3]

Operating lease conversions to finance lease

^[3]

Right-of-use assets acquired through operating leases

103

^[3]

Property and equipment acquired through finance leases

$ 8

$ 0

^[3]

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2]	The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet:Cash and cash equivalents$1,848 $2,404Restricted cash (included in Prepaid expenses and other)— 11Restricted cash103 95Total cash, cash equivalents and restricted cash $1,951 $2,510
[3]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[4]	The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet:Cash and cash equivalents$1,842 $2,398Restricted cash (included in Prepaid expenses and other)— 11Restricted cash103 95Total cash, cash equivalents and restricted cash $1,945 $2,504

Condensed Statements of Consolidated Cash Flows (Unaudited) (Parenthetical) - USD ($)
$ in Millions

Mar. 31, 2019

Dec. 31, 2018

Mar. 31, 2018

Reconciliation of cash, cash equivalents and restricted cash:

Restricted cash (included in Prepaid expenses and other)

$ 1,848

$ 1,694

^[1]

$ 2,404

^[2]

^[2]

Total cash, cash equivalents and restricted cash

103

105

^[1]

^[2]

1,951

^[3]

1,799

2,510

^[2],[3]

Reconciliation of cash, cash equivalents and restricted cash:

Restricted cash (included in Prepaid expenses and other)

1,842

1,688

^[4]

2,398

^[5]

^[5]

Total cash, cash equivalents and restricted cash

103

105

^[4]

^[5]

$ 1,945

^[6]

$ 1,793

$ 2,504

^[5],[6]

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[3]	The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet:Cash and cash equivalents$1,848 $2,404Restricted cash (included in Prepaid expenses and other)— 11Restricted cash103 95Total cash, cash equivalents and restricted cash $1,951 $2,510
[4]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[5]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[6]	The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet:Cash and cash equivalents$1,842 $2,398Restricted cash (included in Prepaid expenses and other)— 11Restricted cash103 95Total cash, cash equivalents and restricted cash $1,945 $2,504

Statements of Consolidated Stockholders' Equity - USD ($)
$ in Millions

Total

United Airlines, Inc.

Common Stock

Additional Capital Invested

United Airlines, Inc.

Treasury Stock

Retained Earnings

United Airlines, Inc.

Accumulated Other Comprehensive Income (Loss)

United Airlines, Inc.

Receivable from Related Parties, Net

United Airlines, Inc.

Balance (in shares) at Dec. 31, 2017

^[1]

287,000,000

Balance at Dec. 31, 2017

$ 8,788

^[1]

$ 8,751

^[2]

$ 3

^[1]

$ 6,098

^[1]

$ 1,787

^[2]

$ (769)

^[1]

$ 4,603

^[1]

$ 8,201

^[2]

$ (1,147)

^[1]

$ (1,147)

^[2]

$ (90)

^[2]

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Other comprehensive income

145

^[1],[3],[4]

145

^[2],[5],[6]

145

^[1]

145

^[2]

^[4]

^[6]

Other comprehensive income

Dividend to UAL

(569)

Stock settled share-based compensation

Repurchases of common stock (in shares)

(7,800,000)

Repurchases of common stock

(569)

Net treasury stock issued for share-based awards (in shares)

200,000

Net treasury stock issued for share-based awards

(17)

(36)

(5)

Balance (in shares) at Mar. 31, 2018

(18)

(7)

(18)

^[1]

279,400,000

Balance at Mar. 31, 2018

$ 8,388

^[1]

$ 8,350

^[2]

$ 3

^[1]

6,077

^[1]

1,233

^[2]

(1,314)

^[1]

4,736

^[1]

8,339

^[2]

(1,114)

^[1]

(1,114)

^[2]

(108)

^[2]

Balance (in shares) at Dec. 31, 2018

269,914,769

1,000

269,900,000

^[1]

Balance at Dec. 31, 2018

$ 10,042

^[1],[7]

$ 10,004

^[2],[8]

$ 3

^[1]

6,120

^[1]

598

^[2]

(1,993)

^[1]

6,715

^[1]

10,319

^[2]

(803)

^[1]

(803)

^[2]

(110)

^[2]

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Other comprehensive income

292

293

292

293

Dividend to UAL

(528)

Stock settled share-based compensation

Repurchases of common stock (in shares)

(6,100,000)

Repurchases of common stock

(527)

Net treasury stock issued for share-based awards (in shares)

500,000

Net treasury stock issued for share-based awards

$ (29)

(54)

(8)

Balance (in shares) at Mar. 31, 2019

$ (30)

(30)

264,271,125

1,000

264,300,000

Balance at Mar. 31, 2019

$ 9,802

$ 9,763

$ 3

$ 6,080

$ 84

$ (2,487)

$ 6,999

$ 10,612

$ (793)

$ (140)

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.The accompanying Combined Notes to Condensed Consolidated Financial Statements are an integral part of these statements.
[3]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[4]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[5]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[6]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[7]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[8]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Recently Issued Accounting Standards

3 Months Ended

Mar. 31, 2019

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

RECENTLY ISSUED ACCOUNTING STANDARDS

The Company adopted Financial Accounting Standards Board ("FASB") Accounting Standards Codification Topic 842, Leases (the "New Lease Standard"), effective January 1, 2019. The Company used the modified retrospective approach for all leases existing at or commencing after January 1, 2017 and elected the package of transition practical expedients for expired or existing contracts, which does not require reassessment of: (1) whether any of our contracts are or contain leases, (2) lease classification and (3) initial direct costs. The New Lease Standard prescribes that an entity should recognize a right-of-use asset and a lease liability for all leases at the commencement date of each lease and recognize expenses on their income statements similar to the prior FASB Accounting Standards Codification Topic 840, Leases ("Topic 840").

The adoption of the New Lease Standard had the same impact on the financial statements of United as it had on the financial statements of UAL. The table below presents the impact of the adoption of the New Lease Standard on select accounts and captions of UAL's statement of consolidated operations for the first quarter of 2018 (in millions, except per share amounts):



	As Reported			New Lease Standard Adjustments			As Adjusted
Regional capacity purchase	$	619		$	11		$	630
Landing fees and other rent	558			21			579
Depreciation and amortization	541			(17		)	524
Interest expense	(176		)	14			(162		)
Interest capitalized	19			(1		)	18
Net income	147			(2		)	145
Earnings per share, basic and diluted	0.52			(0.01		)	0.51

The expense for leases under the New Lease Standard will continue to be classified in their historical income statement captions (primarily in Aircraft rent, Landing fees and other rent and Regional capacity purchase in our statements of consolidated operations). The adoption of the New Lease Standard resulted in the recharacterization of certain leases from capital leases under Topic 840 to operating leases under the New Lease Standard. This change resulted in less depreciation and amortization and interest expense associated with capital leases offset by higher lease expense associated with operating leases. The recharacterization is associated with leases of certain airport facilities that were derecognized as part of the build-to-suit transition guidance under the New Lease Standard. The reduction in capitalized interest is also associated with the same airport facilities leases.

The table below presents the impact of the adoption of the New Lease Standard on UAL's balance sheet accounts and captions as of December 31, 2018 (in millions):



	As Reported			New Lease Standard Adjustments			As Adjusted
Receivables, less allowance for doubtful accounts	$	1,346		$	80		$	1,426
Prepaid expenses and other	913			(180		)	733
Flight equipment, owned and finance leases (a)	32,636			(37		)	32,599
Other property and equipment, owned and finance leases (a)	7,930			(1,041		)	6,889
Less-Accumulated depreciation and amortization, owned and finance leases (a)	(13,414		)	148			(13,266		)
Operating lease right-of-use assets	—			5,262			5,262
Current maturities of finance leases (a)	149			(26		)	123
Current maturities of operating leases	—			719			719
Other current liabilities	619			(66		)	553
Long-term obligations under finance leases (a)	1,134			(910		)	224
Long-term obligations under operating leases	—			5,276			5,276
Deferred income taxes	814			14			828
Other long-term liabilities	1,832			(822		)	1,010
Retained earnings	6,668			47			6,715

(a) Finance leases, under the New Lease Standard, are the equivalent of capital leases under Topic 840.

The table below presents the impact of the adoption of the New Lease Standard on select line items of UAL's statement of consolidated cash flows for the first quarter of 2018 (in millions):



	As Reported			New Lease Standard Adjustments			As Adjusted
Cash Flows from Operating Activities:
Net cash provided by operating activities	$	1,733		$	(24	)	$	1,709

Cash Flows from Investing Activities:
Capital expenditures	(979		)	35			(944		)

Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt	696			(23		)	673
Principal payments under finance leases	(30		)	12			(18		)

The adoption of the New Lease Standard primarily resulted in the recording of assets and obligations of our operating leases on our consolidated balance sheets. Certain amounts recorded for prepaid and accrued rent associated with historical operating leases were reclassified to the newly captioned Operating lease right-of-use assets in the consolidated balance sheets. Also, certain leases designated under Topic 840 as owned assets and capital leases are not considered to be assets under the New Lease Standard and have been removed from the consolidated balance sheets, along with the related capital lease liability, due to the leases having variable lease payments.

In June 2016, the FASB issued Accounting Standards Update No. 2016-13, Financial Instruments—Credit Losses ("ASU 2016-13"). The main objective is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The amendments in this update replace the incurred loss methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to calculate credit loss estimates. For trade receivables, loans and held-to-maturity debt securities, entities will be required to estimate lifetime expected credit losses. For available-for-sale debt securities, entities will be required to recognize an allowance for credit losses rather than a reduction to the carrying value of the asset. The amendments are effective for public business entities for fiscal years and interim periods beginning after December 15, 2019. The Company is evaluating the impact the adoption of ASU 2016-13 will have on its consolidated financial statements.

Revenue

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

REVENUE

Revenue by Geography. The following table presents operating revenue by geographic region (in millions):



	Three Months Ended March 31,
	2019		2018
Domestic (U.S. and Canada)	$	5,875	$	5,476
Atlantic	1,458		1,389
Pacific	1,281		1,231
Latin America	975		936
Total	$	9,589	$	9,032

Ancillary Fees. The Company charges fees, separately from ticket sales, for certain ancillary services that are directly related to passengers' travel, such as ticket change fees, baggage fees, inflight amenities fees, and other ticket-related fees. These ancillary fees are part of the travel performance obligation and, as such, are recognized as passenger revenue when the travel occurs. The Company recorded $571 million and $497 million of ancillary fees within passenger revenue in the three months ended March 31, 2019 and 2018, respectively.

Advance Ticket Sales. All tickets sold at any given point of time have travel dates extending up to twelve months. The Company defers amounts related to future travel in its Advance ticket sales liability account. As a result, the balance of the Company's Advance ticket sales liability represents activity that will be recognized in the next twelve months. In the three months ended March 31, 2019 and 2018, the Company recognized approximately $2.7 billion and $2.5 billion, respectively, of passenger revenue for tickets that were included in Advance ticket sales at the beginning of those periods.

Frequent Flyer Accounting. The table below presents a roll forward of Frequent flyer deferred revenue (in millions):



	Three Months Ended March 31,
	2019			2018
Total Frequent flyer deferred revenue - beginning balance	$	5,005		$	4,783
Miles awarded	607			603
Travel miles redeemed (Passenger revenue)	(438		)	(409		)
Non-travel miles redeemed (Other operating revenue)	(36		)	(40		)
Total Frequent flyer deferred revenue - ending balance	$	5,138		$	4,937

In the three months ended March 31, 2019 and 2018, the Company recognized, in Other operating revenue, $473 million and $494 million, respectively, related to the marketing, advertising, non-travel miles redeemed (net of related costs) and other travel-related benefits of the mileage revenue associated with our various partner agreements including, but not limited to, our Chase co-brand agreement. The portion related to the MileagePlus miles awarded of the total amounts received from our various partner agreements is deferred and presented in the table above as an increase to the frequent flyer liability.

Earnings Per Share

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

EARNINGS PER SHARE

The computations of UAL's basic and diluted earnings per share are set forth below (in millions, except per share amounts):



	Three Months Ended March 31,
	2019		2018
Earnings available to common stockholders	$	292	$	145

Basic weighted-average shares outstanding	267.0		283.9
Effect of employee stock awards	1.3		1.0
Diluted weighted-average shares outstanding	268.3		284.9

Earnings per share, basic and diluted	$	1.09	$	0.51

In the three months ended March 31, 2019, UAL repurchased approximately 6.3 million shares of UAL common stock in open market transactions for $527 million. As of March 31, 2019, the Company had approximately $1.2 billion remaining to purchase shares under its share repurchase program. UAL may repurchase shares through the open market, privately negotiated transactions, block trades or accelerated share repurchase transactions from time to time in accordance with applicable securities laws. UAL will repurchase shares of UAL common stock subject to prevailing market conditions, and may discontinue such repurchases at any time. See Part II, Item 2, Unregistered Sales of Equity Securities and Use of Proceeds of this report for additional information.

Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The tables below present the components of the Company's accumulated other comprehensive income (loss), net of tax ("AOCI") (in millions):



UAL	Pension and Other Postretirement Liabilities				Investments and Other			Deferred Taxes			Total
UAL	Pension and Other Postretirement Liabilities				Investments and Other			Deferred Taxes			Total
Balance at December 31, 2018	$	(663	)		$	(4	)	$	(136	)	$	(803	)
Changes in value	5				5			(3		)	7
Amounts reclassified to earnings	4			(a)	—			(1		)	3
Balance at March 31, 2019	$	(654	)		$	1		$	(140	)	$	(793	)

Balance at December 31, 2017	$	(1,102	)		$	(6	)	$	(39	)	$	(1,147	)
Changes in value	23				(4		)	(6		)	13
Amounts reclassified to earnings	16			(a)	—			(3		)	13
Amounts reclassified to retained earnings	—				7			—			7
Balance at March 31, 2018	$	(1,063	)		$	(3	)	$	(48	)	$	(1,114	)

(a) This AOCI component is included in the computation of net periodic pension and other postretirement costs (See Note 6 to the financial statements included in Part I, Item 1 for additional information).

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2019
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The Company's effective tax rate for the three months ended March 31, 2019 and 2018 was 20.4% and 20.3%, respectively. The effective tax rate represents a blend of federal, state and foreign taxes and includes the impact of certain nondeductible items and the impact of a change in the Company's mix of domestic and foreign earnings.

Employee Benefit Plans

3 Months Ended

Mar. 31, 2019

EMPLOYEE BENEFIT PLANS

Defined Benefit Pension and Other Postretirement Benefit Plans. The Company's net periodic benefit cost includes the following components for the three months ended March 31 (in millions):



	Pension Benefits						Other Postretirement Benefits						Affected Line Item in the Statements of Consolidated Operations
	2019			2018			2019			2018
Service cost	$	46		$	57		$	2		$	3		Salaries and related costs
Interest cost	57			54			15			15			Miscellaneous, net
Expected return on plan assets	(72		)	(73		)	—			—			Miscellaneous, net
Amortization of unrecognized (gain) loss	29			33			(15		)	(8		)	Miscellaneous, net
Amortization of prior service credit	—			—			(10		)	(9		)	Miscellaneous, net
Total	$	60		$	71		$	(8	)	$	1

During the three months ended March 31, 2019, the Company contributed $150 million to its U.S. domestic tax-qualified defined benefit pension plans.

Share-Based Compensation. In the three months ended March 31, 2019, UAL granted share-based compensation awards pursuant to the United Continental Holdings, Inc. 2017 Incentive Compensation Plan. These share-based compensation awards include 0.5 million restricted stock units ("RSUs"), half of which are time-vested RSUs and half of which are performance-based RSUs. The time-vested RSUs vest pro-rata, on February 28th of each year, over a three-year period from the date of grant. The amount of performance-based RSUs vest based on the Company's relative improvement in pre-tax margin, as compared to a group of industry peers, for the three years ending December 31, 2021. All RSUs are generally equity awards settled in stock for domestic employees and liability awards settled in cash for international employees. The cash payments are based on the 20-day average closing price of UAL common stock immediately prior to the vesting date.

The table below presents information related to share-based compensation (in millions):



	Three Months Ended March 31,
	2019		2018
Share-based compensation expense	$	16	$	17

	March 31, 2019		December 31, 2018
Unrecognized share-based compensation	$	84	$	68

Financial Instruments and Fair Value Measurements

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS

The table below presents disclosures about the financial assets and liabilities measured at fair value on a recurring basis in UAL's financial statements (in millions):



	March 31, 2019								December 31, 2018
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Cash and cash equivalents	$	1,848	$	1,848	$	—	$	—	$	1,694	$	1,694	$	—	$	—
Short-term investments:
Corporate debt	1,014		—		1,014		—		1,023		—		1,023		—
Asset-backed securities	745		—		745		—		746		—		746		—
U.S. government and agency notes	108		—		108		—		108		—		108		—
Certificates of deposit placed through an account registry service ("CDARS")	45		—		45		—		75		—		75		—
Other fixed-income securities	118		—		118		—		116		—		116		—
Other investments measured at net asset value ("NAV")	189		—		—		—		188		—		—		—
Restricted cash	103		103		—		—		105		105		—		—
Long-term investments:
Equity securities	263		263		—		—		249		249		—		—
Enhanced equipment trust certificates ("EETC")	16		—		—		16		18		—		—		18
Avianca Holdings S.A. ("AVH") Derivative Assets	14		—		—		14		11		—		—		11

Available-for-sale investment maturities - The short-term investments shown in the table above are classified as available-for-sale, with the exception of investments measured at NAV. As of March 31, 2019, asset-backed securities have remaining maturities of less than one year to approximately 16 years, corporate debt securities have remaining maturities of less than one year to approximately three years and CDARS have maturities of less than one year. U.S. government and agency notes have maturities of approximately one year or less and other fixed-income securities have maturities of two years or less. The EETC securities mature in July 2019.

Restricted cash - Restricted cash primarily includes collateral for letters of credit and collateral associated with facility leases and other insurance related obligations.

Equity securities - Equity securities represent United's investment in Azul Linhas Aéreas Brasileiras S.A. ("Azul"), consisting of a preferred equity stake of approximately 8% (approximately 2% of the total capital stock of Azul). The Company recognizes changes to the fair market value of its equity investment in Azul in Miscellaneous, net in its statements of consolidated operations.

Synergy Term Loan - In November 2018, United, as lender, entered into a Term Loan Agreement (the "Synergy Loan Agreement") with affiliates of Synergy Aerospace Corporation ("Synergy"), as borrower and guarantor, respectively. Pursuant to the Synergy Loan Agreement, United provided a $456 million term loan to Synergy (the "Synergy Term Loan"), secured by a pledge of borrower's equity, as well as Synergy's 516 million shares of common stock of AVH, the parent company of Aerovías del Continente Americano S.A.

AVH Derivative Assets - As part of the Synergy Loan Agreement and related agreements with AVH's significant minority shareholder, Kingsland Holdings Limited ("Kingsland"), United obtained AVH share call options, AVH share appreciation rights, and an AVH share-based upside sharing agreement (collectively, the "AVH Derivative Assets"). The AVH Derivative Assets are recorded at fair value as Other assets on the Company's balance sheet and are included in the table above. Changes in the fair value of the AVH Derivative Assets are recorded as part of Nonoperating income (expense): Miscellaneous, net on the Company's statements of consolidated operations.

Investments presented in the table above have the same fair value as their carrying value. The table below presents the carrying values and estimated fair values of financial instruments not presented in the tables above (in millions):



	March 31, 2019										December 31, 2018
	Carrying Amount		Fair Value								Carrying Amount		Fair Value
			Total		Level 1		Level 2		Level 3				Total		Level 1		Level 2		Level 3
Long-term debt	$	13,935	$	14,136	$	—	$	10,307	$	3,829	$	13,445	$	13,450	$	—	$	9,525	$	3,925
Synergy Term Loan	480		422		—		—		422		478		422		—		—		422

Fair value of the financial instruments included in the tables above was determined as follows:



Description	Fair Value Methodology
Cash and cash equivalents	The carrying amounts approximate fair value because of the short-term maturity of these assets.
Short-term investments, Equity securities, EETC and Restricted cash	Fair value is based on (a) the trading prices of the investment or similar instruments, (b) an income approach, which uses valuation techniques to convert future amounts into a single present amount based on current market expectations about those future amounts when observable trading prices are not available, or (c) broker quotes obtained by third-party valuation services.
Other investments measured at NAV	In accordance with the relevant accounting standards, certain investments that are measured at fair value using the NAV per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the table above are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position. The investments measured using NAV are shares of mutual funds that invest in fixed-income instruments including bonds, debt securities, and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. The Company can redeem its shares at any time at NAV subject to a three-day settlement period.
Long-term debt	Fair values were based on either market prices or the discounted amount of future cash flows using our current incremental rate of borrowing for similar liabilities or assets.
Synergy Term Loan and AVH Derivative Assets	Fair values are calculated using a Monte Carlo simulation approach. Unobservable inputs include expected volatility, expected dividend yield and control and acquisition premiums.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Leases

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

LEASES

United leases aircraft, airport passenger terminal space, aircraft hangars and related maintenance facilities, cargo terminals, other airport facilities, other commercial real estate, office and computer equipment and vehicles, among other items. Certain of these leases include provisions for variable lease payments which are based on several factors, including, but not limited to, relative leased square footage, available seat miles, enplaned passengers, passenger facility charges, terminal equipment usage fees, departures, and airports’ annual operating budgets. Due to the variable nature of the rates, these leases are not recorded on our balance sheet as a right-of-use asset and lease liability.

For leases with terms greater than 12 months, we record the related asset and lease liability at the present value of lease payments over the lease term. Leases with an initial term of 12 months or less with purchase options or extension options that are not reasonably certain to be exercised are not recorded on the balance sheet; we recognize lease expense for these leases on a straight-line basis over the term of the lease. We combine lease and non-lease components, such as common area maintenance costs, in calculating the right-of-use assets and lease liabilities for all asset groups except for our capacity purchase agreements ("CPAs"), which contain embedded leases for regional aircraft. In addition to the lease component cost for regional aircraft, our CPAs also include non-lease components primarily related to the regional carriers’ operating costs incurred in providing regional aircraft services. We allocate consideration separately for the lease components and non-lease components of each CPA based on their relative standalone values.

Lease Cost. The Company's lease cost for the three months ended March 31 included the following components (in millions):



	2019			2018
Operating lease cost	$	272		$	326
Variable and short-term lease cost	606			611
Amortization of finance lease assets	18			23
Interest on finance lease liabilities	27			5
Sublease income	(8		)	(10		)
Total lease cost	$	915		$	955

Lease terms and commitments. United's leases include aircraft and non-aircraft leases. Aircraft operating leases relate to leases of 122 mainline and 341 regional aircraft while finance leases relate to leases of 30 mainline and 76 regional aircraft. United's aircraft leases have remaining lease terms of 2 months to 10 years with expiration dates ranging from 2019 through 2029. Under the terms of most aircraft leases, United has the right to purchase the aircraft at the end of the lease term, in some cases at fair market value, and in others, at a percentage of cost.

Non-aircraft leases have remaining lease terms of 1 month to 34 years, with expiration dates ranging from 2019 through 2053.

The table below summarizes the Company's scheduled future minimum lease payments under operating and finance leases, recorded on the balance sheet, as of March 31, 2019 (in millions):



	Operating Leases			Finance Leases
Last nine months of 2019	$	662		$	195
2020	985			96
2021	763			74
2022	630			47
2023	617			33
After 2023	4,252			69
Minimum lease payments	7,909			514
Imputed interest	2,125			145
Present value of minimum lease payments	5,784			369
Less: current maturities of lease obligations	(639		)	(133		)
Long-term lease obligations	$	5,145		$	236

As of March 31, 2019, we have additional leases that have not yet commenced with an aggregate value of approximately $140 million. These leases will commence between 2019 and 2020 with lease terms of up to 34 years.

To the extent a lease agreement includes an extension option that is reasonably certain to be exercised, we have recognized those amounts as part of our right-of-use assets and lease liabilities.

Our lease agreements do not provide a readily determinable implicit rate nor is it available to us from our lessors. Instead, we estimate United's incremental borrowing rate based on information available at lease commencement in order to discount lease payments to present value. The table below presents additional information related to our leases as of March 31:



	2019			2018
Weighted-average remaining lease term - finance leases	5 years			5 years
Weighted-average remaining lease term - operating leases	10 years			10 years
Weighted-average discount rate - finance leases	50.5	%	(a)	6.7	%
Weighted-average discount rate - operating leases	5.2	%		5.0	%

(a) During the third quarter of 2018, United entered into an agreement with the lessor of 54 Embraer ERJ 145 aircraft to purchase those aircraft in 2019. The provisions of these lease agreements resulted in a change in accounting classification of these leases from operating leases to finance leases up until the purchase date. The discount rates used for these leases were adjusted so that the present value of lease payments did not exceed the fair value of the asset being recognized.

The table below presents supplemental cash flow information related to leases during the three months ended March 31:



	2019		2018
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	285	$	279
Operating cash flows for finance leases	24		5
Financing cash flows for finance leases	20		18

Commitments and Contingencies

3 Months Ended

Mar. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

Commitments. As of March 31, 2019, United had firm commitments and options to purchase aircraft from The Boeing Company ("Boeing"), Airbus S.A.S. ("Airbus") and Embraer S.A. ("Embraer") presented in the table below:



Aircraft Type		Number of Firm Commitments (a)
Airbus A350		45
Boeing 737 MAX		171
Boeing 777-300ER		4
Boeing 787		20
Embraer E175		25
(a) United also has options and purchase rights for additional aircraft.

The aircraft listed in the table above are scheduled for delivery through 2027. To the extent the Company and the aircraft manufacturers with whom the Company has existing orders for new aircraft agree to modify the contracts governing those orders, the amount and timing of the Company's future capital commitments could change. For the remainder of 2019, the Company is scheduled to take delivery of 25 Embraer E175 aircraft, 16 Boeing 737 MAX aircraft, 4 Boeing 787 aircraft and 2 Boeing 777-300ER aircraft. In 2020, the Company is scheduled to take delivery of 28 Boeing 737 MAX aircraft, 15 Boeing 787 aircraft and 2 Boeing 777-300ER aircraft. United also has agreements to purchase 20 used Airbus A319 aircraft with expected delivery dates through 2022.

During the third quarter of 2018, United entered into an agreement with the lessor of 54 Embraer ERJ 145 aircraft to purchase those aircraft in 2019.

On March 13, 2019 the Federal Aviation Administration issued an emergency order prohibiting the operation of Boeing 737 MAX series airplanes by U.S. certified operators. As a result, the Company grounded all 14 Boeing 737 MAX 9 aircraft in its fleet. Prior to the grounding, the Company operated approximately 50 flights a day on these aircraft, and expected, given the delivery schedule, to operate approximately 110 flights a day by the end of the year. The Company has proactively managed the ongoing effects of this grounding. Through a combination of spare aircraft and rebooking customers, the Company has experienced a modest operational and financial impact as of March 31, 2019 as a result of this grounding. However, the operational and financial impact could increase based on a number of factors, including, among others, the period of time the aircraft are unavailable, the availability of replacement aircraft, to the extent needed, and the circumstances of any reintroduction of the grounded aircraft to service.

The table below summarizes United's commitments as of March 31, 2019, which include aircraft and related spare engines, aircraft improvements and all non-aircraft capital commitments:



	(in billions)
Last nine months of 2019	$	2.5
2020	5.4
2021	3.7
2022	3.1
2023	2.0
After 2023	7.0
	$	23.7

Guarantees. As of March 31, 2019, United is the guarantor of approximately $1.9 billion in aggregate principal amount of tax-exempt special facilities revenue bonds and interest thereon. These bonds, issued by various airport municipalities, are payable solely from rentals paid under long-term agreements with the respective governing bodies. The leasing arrangements associated with these obligations are accounted for as operating leases recognized on the Company's balance sheet with the associated expense recorded on a straight-line basis resulting in ratable accrual of the lease obligation over the expected lease term. The obligations associated with these tax-exempt special facilities revenue bonds are included in our lease commitments disclosed in Note 8 of this report. All of these bonds are due between 2019 and 2038.

In connection with funding the Synergy Loan Agreement, the Company entered into an agreement with AVH's significant minority shareholder, Kingsland, pursuant to which, in return for Kingsland's pledge of its 144.8 million shares of AVH common stock (equivalent to 18.1 million American Depositary Receipts ("ADRs")) and its consent to Synergy's pledge of its AVH common stock to United under the Synergy Loan Agreement, United (1) granted to Kingsland the right to put its shares of AVH common stock to United at market price on the fifth anniversary of the Synergy Loan Agreement, and (2) guaranteed Synergy's obligation to pay Kingsland (which amount, if paid by United, will increase United's secured loan to Synergy by such amount) if the market price of AVH common stock on the fifth anniversary is less than $12 per ADR on the New York Stock Exchange, for an aggregate maximum possible combined put payment and guarantee amount on the fifth anniversary of $217 million. Accordingly, the Company recorded a liability of $31 million for the fair value of its guarantee to loan additional funds to Synergy if required. Any additional loans to Synergy would be collateralized by Synergy's shares of AVH stock and other collateral.

Increased Cost Provisions. In United's financing transactions that include loans, United typically agrees to reimburse lenders for any reduced returns with respect to the loans due to any change in capital requirements and, in the case of loans in which the interest rate is based on the London Interbank Offered Rate, for certain other increased costs that the lenders incur in carrying these loans as a result of any change in law, subject, in most cases, to obligations of the lenders to take certain limited steps to mitigate the requirement for, or the amount of, such increased costs. At March 31, 2019, the Company had $3.4 billion of floating rate debt and $18 million of fixed rate debt with remaining terms of up to 12 years that are subject to these increased cost provisions. In several financing transactions involving loans or leases from non-U.S. entities, with remaining terms of up to 12 years and an aggregate balance of $3.2 billion, the Company bears the risk of any change in tax laws that would subject loan or lease payments thereunder to non-U.S. entities to withholding taxes, subject to customary exclusions.

As of March 31, 2019, United is the guarantor of $142 million of aircraft mortgage debt issued by one of United's regional carriers. The aircraft mortgage debt is subject to similar increased cost provisions as described above for the Company's debt, and the Company would potentially be responsible for those costs under the guarantees.

Labor Negotiations. As of March 31, 2019, the Company had approximately 93,000 employees, of whom approximately 84% were represented by various U.S. labor organizations. On February 1, 2019, the collective bargaining agreement with the Air Line Pilots Association ("ALPA"), the union representing United’s pilots, became amendable. The Company and ALPA are in negotiations for an amended agreement. The Company and UNITE HERE, the labor union representing United's Catering Operations employees, started negotiations for a first collective bargaining agreement in March 2019.

Debt

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

DEBT

As of March 31, 2019, UAL and United were in compliance with their respective debt covenants. As of March 31, 2019, United had its entire capacity of $2.0 billion available under the revolving credit facility of the Amended and Restated Credit and Guaranty Agreement.

EETCs. In February 2019, United created two new EETC pass-through trusts, each of which issued pass-through certificates. The proceeds of the issuance of the pass-through certificates are used to purchase equipment notes issued by United and secured by its aircraft. The Company records the debt obligation upon issuance of the equipment notes rather than upon the initial issuance of the pass-through certificates. The pass-through certificates represent fractional undivided interests in the respective pass-through trusts and are not obligations of United. The payment obligations under the equipment notes are those of United. Proceeds received from the sale of pass-through certificates are initially held by a depositary in escrow for the benefit of the certificate holders until United issues equipment notes to the trust, which purchases such notes with a portion of the escrowed funds. These escrowed funds are not guaranteed by United and are not reported as debt on our consolidated balance sheet because the proceeds held by the depositary are not United's assets. Certain details of the pass-through trusts with proceeds received from issuance of debt in 2019 are as follows (in millions, except stated interest rate):



EETC Date	Class	Principal		Final expected distribution date	Stated interest rate	Total debt recorded as of March 31, 2019		Proceeds received from issuance of debt during 2019		Remaining proceeds from issuance of debt to be received in future periods
February 2019	AA	$	717	August 2031	4.15%	$	522	$	522	$	195
February 2019	A	296		August 2031	4.55%	216		216		80
		$	1,013			$	738	$	738	$	275

The table below presents the Company's contractual principal payments (not including debt discount or debt issuance costs) at March 31, 2019 under then-outstanding long-term debt agreements (in millions):



Last nine months of 2019	$	979
2020	1,344
2021	1,338
2022	1,690
2023	740
After 2023	8,033
	$	14,124

Special Charges and Mark-to-Market ("MTM") Adjustments

3 Months Ended

Mar. 31, 2019

Other Income and Expenses [Abstract]

SPECIAL CHARGES AND MARK-TO-MARKET (MTM) ADJUSTMENTS

SPECIAL CHARGES AND MARK-TO-MARKET ("MTM") ADJUSTMENTS

For the three months ended March 31, special charges and MTM adjustments consisted of the following (in millions):



	Three Months Ended March 31,
Operating:	2019			2018
Impairment of assets	$	8		$	23
Severance and benefit costs	6			14
(Gains) losses on sale of assets and other special charges	4			3
Total operating special charges	18			40
Nonoperating MTM gains on financial instruments	(17		)	(45		)
Total special charges and MTM gains on financial instruments	1			(5		)
Income tax expense	—			1
Total special charges and MTM gains on financial instruments, net of income tax	$	1		$	(4	)

During the three months ended March 31, 2019, the Company recorded an $8 million fair value adjustment for aircraft purchased off lease.

During the three months ended March 31, 2019, the Company recorded severance and benefit costs related to a voluntary early-out program for its technicians and related employees represented by the International Brotherhood of Teamsters (the "IBT") of $2 million. In the first quarter of 2017, approximately 1,000 technicians and related employees elected to voluntarily separate from the Company and received a severance payment, with a maximum value of $100,000 per participant, based on years of service, with retirement dates through early 2019. Also during the three months ended March 31, 2019, the Company recorded management severance of $4 million.

During the three months ended March 31, 2019, the Company recorded gains of $14 million for the change in market value of its investment in Azul. Also, the Company recorded gains of $3 million for the change in fair value of certain derivative assets related to equity of AVH. For equity investments and derivative assets subject to MTM accounting, the Company records gains and losses as part of Nonoperating income (expense): Miscellaneous, net in its statements of consolidated operations.

During the three months ended March 31, 2018, the Company recorded a $23 million fair value adjustment for aircraft purchased off lease and impairments related to certain fleet types and certain international slots no longer in use.

During the three months ended March 31, 2018, the Company recorded severance and benefit costs related to the early out program described above and management severance of $8 million and $6 million, respectively.

During the three months ended March 31, 2018, the Company recorded a gain of $45 million for the change in market value of its investment in Azul.

Recently Issued Accounting Standards (Policies)

3 Months Ended

Mar. 31, 2019

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recently Issued Accounting Standards



	As Reported			New Lease Standard Adjustments			As Adjusted
Regional capacity purchase	$	619		$	11		$	630
Landing fees and other rent	558			21			579
Depreciation and amortization	541			(17		)	524
Interest expense	(176		)	14			(162		)
Interest capitalized	19			(1		)	18
Net income	147			(2		)	145
Earnings per share, basic and diluted	0.52			(0.01		)	0.51

The table below presents the impact of the adoption of the New Lease Standard on UAL's balance sheet accounts and captions as of December 31, 2018 (in millions):



	As Reported			New Lease Standard Adjustments			As Adjusted
Receivables, less allowance for doubtful accounts	$	1,346		$	80		$	1,426
Prepaid expenses and other	913			(180		)	733
Flight equipment, owned and finance leases (a)	32,636			(37		)	32,599
Other property and equipment, owned and finance leases (a)	7,930			(1,041		)	6,889
Less-Accumulated depreciation and amortization, owned and finance leases (a)	(13,414		)	148			(13,266		)
Operating lease right-of-use assets	—			5,262			5,262
Current maturities of finance leases (a)	149			(26		)	123
Current maturities of operating leases	—			719			719
Other current liabilities	619			(66		)	553
Long-term obligations under finance leases (a)	1,134			(910		)	224
Long-term obligations under operating leases	—			5,276			5,276
Deferred income taxes	814			14			828
Other long-term liabilities	1,832			(822		)	1,010
Retained earnings	6,668			47			6,715

(a) Finance leases, under the New Lease Standard, are the equivalent of capital leases under Topic 840.

The table below presents the impact of the adoption of the New Lease Standard on select line items of UAL's statement of consolidated cash flows for the first quarter of 2018 (in millions):



	As Reported			New Lease Standard Adjustments			As Adjusted
Cash Flows from Operating Activities:
Net cash provided by operating activities	$	1,733		$	(24	)	$	1,709

Cash Flows from Investing Activities:
Capital expenditures	(979		)	35			(944		)

Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt	696			(23		)	673
Principal payments under finance leases	(30		)	12			(18		)

Fair Value of Financial Instruments

Fair value of the financial instruments included in the tables above was determined as follows:



Description	Fair Value Methodology
Cash and cash equivalents	The carrying amounts approximate fair value because of the short-term maturity of these assets.
Short-term investments, Equity securities, EETC and Restricted cash	Fair value is based on (a) the trading prices of the investment or similar instruments, (b) an income approach, which uses valuation techniques to convert future amounts into a single present amount based on current market expectations about those future amounts when observable trading prices are not available, or (c) broker quotes obtained by third-party valuation services.
Other investments measured at NAV	In accordance with the relevant accounting standards, certain investments that are measured at fair value using the NAV per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the table above are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position. The investments measured using NAV are shares of mutual funds that invest in fixed-income instruments including bonds, debt securities, and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. The Company can redeem its shares at any time at NAV subject to a three-day settlement period.
Long-term debt	Fair values were based on either market prices or the discounted amount of future cash flows using our current incremental rate of borrowing for similar liabilities or assets.
Synergy Term Loan and AVH Derivative Assets	Fair values are calculated using a Monte Carlo simulation approach. Unobservable inputs include expected volatility, expected dividend yield and control and acquisition premiums.

Recently Issued Accounting Standards (Tables)

3 Months Ended

Mar. 31, 2019

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Impact of the Adoption of the New Lease Standard

The table below presents the impact of the adoption of the New Lease Standard on UAL's balance sheet accounts and captions as of December 31, 2018 (in millions):



	As Reported			New Lease Standard Adjustments			As Adjusted
Receivables, less allowance for doubtful accounts	$	1,346		$	80		$	1,426
Prepaid expenses and other	913			(180		)	733
Flight equipment, owned and finance leases (a)	32,636			(37		)	32,599
Other property and equipment, owned and finance leases (a)	7,930			(1,041		)	6,889
Less-Accumulated depreciation and amortization, owned and finance leases (a)	(13,414		)	148			(13,266		)
Operating lease right-of-use assets	—			5,262			5,262
Current maturities of finance leases (a)	149			(26		)	123
Current maturities of operating leases	—			719			719
Other current liabilities	619			(66		)	553
Long-term obligations under finance leases (a)	1,134			(910		)	224
Long-term obligations under operating leases	—			5,276			5,276
Deferred income taxes	814			14			828
Other long-term liabilities	1,832			(822		)	1,010
Retained earnings	6,668			47			6,715

(a) Finance leases, under the New Lease Standard, are the equivalent of capital leases under Topic 840.

The table below presents the impact of the adoption of the New Lease Standard on select line items of UAL's statement of consolidated cash flows for the first quarter of 2018 (in millions):



	As Reported			New Lease Standard Adjustments			As Adjusted
Cash Flows from Operating Activities:
Net cash provided by operating activities	$	1,733		$	(24	)	$	1,709

Cash Flows from Investing Activities:
Capital expenditures	(979		)	35			(944		)

Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt	696			(23		)	673
Principal payments under finance leases	(30		)	12			(18		)

The table below presents the impact of the adoption of the New Lease Standard on select accounts and captions of UAL's statement of consolidated operations for the first quarter of 2018 (in millions, except per share amounts):



	As Reported			New Lease Standard Adjustments			As Adjusted
Regional capacity purchase	$	619		$	11		$	630
Landing fees and other rent	558			21			579
Depreciation and amortization	541			(17		)	524
Interest expense	(176		)	14			(162		)
Interest capitalized	19			(1		)	18
Net income	147			(2		)	145
Earnings per share, basic and diluted	0.52			(0.01		)	0.51

Revenue (Tables)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Passenger Revenue by Geographic Region

The following table presents operating revenue by geographic region (in millions):



	Three Months Ended March 31,
	2019		2018
Domestic (U.S. and Canada)	$	5,875	$	5,476
Atlantic	1,458		1,389
Pacific	1,281		1,231
Latin America	975		936
Total	$	9,589	$	9,032

Roll Forward of Frequent Flyer Deferred Revenue

The table below presents a roll forward of Frequent flyer deferred revenue (in millions):



	Three Months Ended March 31,
	2019			2018
Total Frequent flyer deferred revenue - beginning balance	$	5,005		$	4,783
Miles awarded	607			603
Travel miles redeemed (Passenger revenue)	(438		)	(409		)
Non-travel miles redeemed (Other operating revenue)	(36		)	(40		)
Total Frequent flyer deferred revenue - ending balance	$	5,138		$	4,937

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings Per Share

The computations of UAL's basic and diluted earnings per share are set forth below (in millions, except per share amounts):



	Three Months Ended March 31,
	2019		2018
Earnings available to common stockholders	$	292	$	145

Basic weighted-average shares outstanding	267.0		283.9
Effect of employee stock awards	1.3		1.0
Diluted weighted-average shares outstanding	268.3		284.9

Earnings per share, basic and diluted	$	1.09	$	0.51

Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Components of Accumulated Other Comprehensive Income, Net of Tax

The tables below present the components of the Company's accumulated other comprehensive income (loss), net of tax ("AOCI") (in millions):



UAL	Pension and Other Postretirement Liabilities				Investments and Other			Deferred Taxes			Total
UAL	Pension and Other Postretirement Liabilities				Investments and Other			Deferred Taxes			Total
Balance at December 31, 2018	$	(663	)		$	(4	)	$	(136	)	$	(803	)
Changes in value	5				5			(3		)	7
Amounts reclassified to earnings	4			(a)	—			(1		)	3
Balance at March 31, 2019	$	(654	)		$	1		$	(140	)	$	(793	)

Balance at December 31, 2017	$	(1,102	)		$	(6	)	$	(39	)	$	(1,147	)
Changes in value	23				(4		)	(6		)	13
Amounts reclassified to earnings	16			(a)	—			(3		)	13
Amounts reclassified to retained earnings	—				7			—			7
Balance at March 31, 2018	$	(1,063	)		$	(3	)	$	(48	)	$	(1,114	)

Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2019

Components of Net Periodic Benefit Cost

The Company's net periodic benefit cost includes the following components for the three months ended March 31 (in millions):



	Pension Benefits						Other Postretirement Benefits						Affected Line Item in the Statements of Consolidated Operations
	2019			2018			2019			2018
Service cost	$	46		$	57		$	2		$	3		Salaries and related costs
Interest cost	57			54			15			15			Miscellaneous, net
Expected return on plan assets	(72		)	(73		)	—			—			Miscellaneous, net
Amortization of unrecognized (gain) loss	29			33			(15		)	(8		)	Miscellaneous, net
Amortization of prior service credit	—			—			(10		)	(9		)	Miscellaneous, net
Total	$	60		$	71		$	(8	)	$	1

The table below presents information related to share-based compensation (in millions):



	Three Months Ended March 31,
	2019		2018
Share-based compensation expense	$	16	$	17

	March 31, 2019		December 31, 2018
Unrecognized share-based compensation	$	84	$	68

Financial Instruments and Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The table below presents disclosures about the financial assets and liabilities measured at fair value on a recurring basis in UAL's financial statements (in millions):



	March 31, 2019								December 31, 2018
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Cash and cash equivalents	$	1,848	$	1,848	$	—	$	—	$	1,694	$	1,694	$	—	$	—
Short-term investments:
Corporate debt	1,014		—		1,014		—		1,023		—		1,023		—
Asset-backed securities	745		—		745		—		746		—		746		—
U.S. government and agency notes	108		—		108		—		108		—		108		—
Certificates of deposit placed through an account registry service ("CDARS")	45		—		45		—		75		—		75		—
Other fixed-income securities	118		—		118		—		116		—		116		—
Other investments measured at net asset value ("NAV")	189		—		—		—		188		—		—		—
Restricted cash	103		103		—		—		105		105		—		—
Long-term investments:
Equity securities	263		263		—		—		249		249		—		—
Enhanced equipment trust certificates ("EETC")	16		—		—		16		18		—		—		18
Avianca Holdings S.A. ("AVH") Derivative Assets	14		—		—		14		11		—		—		11

Carrying Values and Estimated Fair Values of Financial Instruments

The table below presents the carrying values and estimated fair values of financial instruments not presented in the tables above (in millions):



	March 31, 2019										December 31, 2018
	Carrying Amount		Fair Value								Carrying Amount		Fair Value
			Total		Level 1		Level 2		Level 3				Total		Level 1		Level 2		Level 3
Long-term debt	$	13,935	$	14,136	$	—	$	10,307	$	3,829	$	13,445	$	13,450	$	—	$	9,525	$	3,925
Synergy Term Loan	480		422		—		—		422		478		422		—		—		422

Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Components of Lease Cost

The Company's lease cost for the three months ended March 31 included the following components (in millions):



	2019			2018
Operating lease cost	$	272		$	326
Variable and short-term lease cost	606			611
Amortization of finance lease assets	18			23
Interest on finance lease liabilities	27			5
Sublease income	(8		)	(10		)
Total lease cost	$	915		$	955

Summary of Scheduled Future Minimum Lease Payments under Operating Leases

The table below summarizes the Company's scheduled future minimum lease payments under operating and finance leases, recorded on the balance sheet, as of March 31, 2019 (in millions):



	Operating Leases			Finance Leases
Last nine months of 2019	$	662		$	195
2020	985			96
2021	763			74
2022	630			47
2023	617			33
After 2023	4,252			69
Minimum lease payments	7,909			514
Imputed interest	2,125			145
Present value of minimum lease payments	5,784			369
Less: current maturities of lease obligations	(639		)	(133		)
Long-term lease obligations	$	5,145		$	236

Summary of Scheduled Future Minimum Lease Payments under Finance Leases

The table below summarizes the Company's scheduled future minimum lease payments under operating and finance leases, recorded on the balance sheet, as of March 31, 2019 (in millions):



	Operating Leases			Finance Leases
Last nine months of 2019	$	662		$	195
2020	985			96
2021	763			74
2022	630			47
2023	617			33
After 2023	4,252			69
Minimum lease payments	7,909			514
Imputed interest	2,125			145
Present value of minimum lease payments	5,784			369
Less: current maturities of lease obligations	(639		)	(133		)
Long-term lease obligations	$	5,145		$	236

Additional Information Related to Leases

The table below presents additional information related to our leases as of March 31:



	2019			2018
Weighted-average remaining lease term - finance leases	5 years			5 years
Weighted-average remaining lease term - operating leases	10 years			10 years
Weighted-average discount rate - finance leases	50.5	%	(a)	6.7	%
Weighted-average discount rate - operating leases	5.2	%		5.0	%

Supplemental Cash Flow Information Related to Leases

The table below presents supplemental cash flow information related to leases during the three months ended March 31:



	2019		2018
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	285	$	279
Operating cash flows for finance leases	24		5
Financing cash flows for finance leases	20		18

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

Firm Commitments and Options to Purchase Aircraft and Summary of Commitments

As of March 31, 2019, United had firm commitments and options to purchase aircraft from The Boeing Company ("Boeing"), Airbus S.A.S. ("Airbus") and Embraer S.A. ("Embraer") presented in the table below:



Aircraft Type		Number of Firm Commitments (a)
Airbus A350		45
Boeing 737 MAX		171
Boeing 777-300ER		4
Boeing 787		20
Embraer E175		25
(a) United also has options and purchase rights for additional aircraft.

The table below summarizes United's commitments as of March 31, 2019, which include aircraft and related spare engines, aircraft improvements and all non-aircraft capital commitments:



	(in billions)
Last nine months of 2019	$	2.5
2020	5.4
2021	3.7
2022	3.1
2023	2.0
After 2023	7.0
	$	23.7

Debt (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Details of Pass Through Trusts

Certain details of the pass-through trusts with proceeds received from issuance of debt in 2019 are as follows (in millions, except stated interest rate):



EETC Date	Class	Principal		Final expected distribution date	Stated interest rate	Total debt recorded as of March 31, 2019		Proceeds received from issuance of debt during 2019		Remaining proceeds from issuance of debt to be received in future periods
February 2019	AA	$	717	August 2031	4.15%	$	522	$	522	$	195
February 2019	A	296		August 2031	4.55%	216		216		80
		$	1,013			$	738	$	738	$	275

Contractual Principal Payments under Long-Term Debt Agreements



Last nine months of 2019	$	979
2020	1,344
2021	1,338
2022	1,690
2023	740
After 2023	8,033
	$	14,124

Special Charges and Mark-to-Market ("MTM") Adjustments (Tables)

3 Months Ended

Mar. 31, 2019

Other Income and Expenses [Abstract]

Components of Special Charges

For the three months ended March 31, special charges and MTM adjustments consisted of the following (in millions):



	Three Months Ended March 31,
Operating:	2019			2018
Impairment of assets	$	8		$	23
Severance and benefit costs	6			14
(Gains) losses on sale of assets and other special charges	4			3
Total operating special charges	18			40
Nonoperating MTM gains on financial instruments	(17		)	(45		)
Total special charges and MTM gains on financial instruments	1			(5		)
Income tax expense	—			1
Total special charges and MTM gains on financial instruments, net of income tax	$	1		$	(4	)

Recently Issued Accounting Standards - Impact of the Adoption of the New Lease Standard on the Statement of Consolidated Operations (Details) - USD ($)
$ / shares in Units, $ in Millions

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

$ 688

$ 630

^[1]

588

579

^[1]

547

524

^[1]

(188)

(162)

^[1]

^[1]

Earnings per share, basic and diluted (in dollars per share)

$ 292

$ 145

^[1],[2],[3]

$ 1.09

$ 0.51

^[1]

As Reported

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

$ 619

558

541

(176)

Earnings per share, basic and diluted (in dollars per share)

$ 147

$ 0.52

New Lease Standard | Adjustments

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

$ 11

(17)

(1)

Earnings per share, basic and diluted (in dollars per share)

$ (2)

$ (0.01)

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[3]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Recently Issued Accounting Standards - Impact of the Adoption of the New Lease Standard on the Balance Sheet (Details) - USD ($)
$ in Millions

Mar. 31, 2019

Dec. 31, 2018

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Receivables, less allowance for doubtful accounts

$ 1,789

$ 1,426

^[1]

Flight equipment, owned and finance leases

780

733

^[1]

33,705

32,599

^[1]

Other property and equipment, owned and finance leases

7,165

6,889

^[1]

5,065

5,262

^[1]

133

123

^[1]

Other current liabilities

639

719

^[1]

601

553

^[1]

236

224

^[1]

5,145

5,276

^[1]

Other long-term liabilities

898

828

^[1]

998

1,010

^[1]

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

$ 6,999

6,715

^[1]

As Reported

Receivables, less allowance for doubtful accounts

1,346

Flight equipment, owned and finance leases

913

32,636

Other property and equipment, owned and finance leases

7,930

Less-Accumulated depreciation and amortization, owned and finance leases

(13,414)

149

Other current liabilities

619

1,134

Other long-term liabilities

814

1,832

New Lease Standard | Adjustments

6,668

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Receivables, less allowance for doubtful accounts

Flight equipment, owned and finance leases

(180)

(37)

Other property and equipment, owned and finance leases

(1,041)

Less-Accumulated depreciation and amortization, owned and finance leases

148

5,262

(26)

Other current liabilities

719

(66)

(910)

5,276

Other long-term liabilities

(822)

$ 47

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Recently Issued Accounting Standards - Impact of the Adoption of the New Lease Standard on the Statement of Cash Flows (Details) - USD ($)
$ in Millions

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

$ 1,915

$ 1,709

^[1]

(1,609)

(944)

^[1]

646

673

^[1]

$ (20)

(18)

^[1]

As Reported

1,733

(979)

696

New Lease Standard | Adjustments

(30)

(24)

(23)

$ 12

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Revenue - Revenue by Principal Geographic Region (Details) - USD ($)
$ in Millions

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Domestic (U.S. and Canada)

$ 9,589

$ 9,032

^[1]

5,875

5,476

Atlantic

1,458

1,389

Pacific

1,281

1,231

Latin America

Revenue From Contract With Customer [Line Items]

$ 975

$ 936

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Revenue - Narrative (Details) - USD ($)
$ in Millions

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Revenue From Contract With Customer [Line Items]

$ 9,589

$ 9,032

^[1]

Passenger Revenue

Ancillary fees

571

497

Passenger Revenue | Deferred Revenue for Miles in Loyalty Program

8,725

8,149

^[1]

Revenue From Contract With Customer [Line Items]

Revenue From Contract With Customer [Line Items]

2,700

2,500

Other Operating Revenue

Other Operating Revenue | Chase and Other Partner Agreements

578

590

^[1]

Revenue From Contract With Customer [Line Items]

Earnings available to common stockholders

$ 473

$ 494

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Revenue - Roll Forward of Frequent Flyer Deferred Revenue (Details) - Deferred Revenue for Miles in Loyalty Program - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Frequent Flyer Deferred Revenue [Roll Forward]
Total Frequent flyer deferred revenue - beginning balance	$ 5,005	$ 4,783
Miles awarded	607	603
Travel miles redeemed (Passenger revenue)	(438)	(409)
Non-travel miles redeemed (Other operating revenue)	(36)	(40)
Total Frequent flyer deferred revenue - ending balance	$ 5,138	$ 4,937

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Earnings Per Share [Abstract]

$ 292

$ 145

Basic weighted-average shares outstanding (in shares)

267.0

283.9

Effect of employee stock awards (in shares)

1.3

1.0

Diluted weighted-average shares outstanding (in shares)

268.3

284.9

Earnings per share, basic and diluted (in dollars per share)

$ 1.09

$ 0.51

^[1]

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Earnings Per Share - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Loss Per Share [Line Items]
Repurchases of common stock	$ 527	$ 569
Open Market Repurchase Program
Earnings Loss Per Share [Line Items]
Number of shares repurchased (in shares)	6.3
Repurchases of common stock	$ 527
Amount remaining under repurchase programs	$ 1,200

Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Millions

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Deferred Tax

$ (136)

$ (39)

(3)

(6)

(1)

(3)

(140)

(48)

Net of Tax

^[2]

10,042

^[1]

8,788

Pension and Other Postretirement Liabilities

9,802

8,388

^[2]

Before Tax

(663)

(1,102)

(654)

(1,063)

Investments and Other

Before Tax

(4)

(6)

(4)

Accumulated Other Comprehensive Income (Loss)

(3)

Net of Tax

^[2]

(803)

(1,147)

Present value of minimum lease payments

$ (793)

$ (1,114)

^[2]

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	20.40%	20.30%

Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 46	$ 57
Interest cost	57	54
Expected return on plan assets	(72)	(73)
Amortization of unrecognized (gain) loss	29	33
Amortization of prior service credit	0	0
Total	60	71
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	3
Interest cost	15	15
Expected return on plan assets	0	0
Amortization of unrecognized (gain) loss	(15)	(8)
Amortization of prior service credit	(10)	(9)
Total	$ (8)	$ 1

Employee Benefit Plans - Narrative (Details) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) shares
Compensation and Retirement Disclosure [Abstract]
Number of days used to compute performance period average closing price of restricted stock units	20 days
RSUs
Compensation and Retirement Disclosure [Abstract]
Awards granted (in shares) \| shares	0.5
Vesting period	3 years
Pension Benefits
Compensation and Retirement Disclosure [Abstract]
Employer contribution to tax-qualified defined benefit pension plans \| $	$ 150

Employee Benefit Plans - Information Related to Share-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Employee-related Liabilities [Abstract]
Share-based compensation expense	$ 16	$ 17
Unrecognized share-based compensation	$ 84		$ 68

Financial Instruments and Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Measured on a Recurring Basis - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 1,848	$ 1,694
Restricted cash	103	105
Equity securities	263	249
Enhanced equipment trust certificates (EETC)	16	18
Avianca Holdings S.A. (AVH) Derivative Assets	14	11
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	1,848	1,694
Restricted cash	103	105
Equity securities	263	249
Enhanced equipment trust certificates (EETC)	0	0
Avianca Holdings S.A. (AVH) Derivative Assets	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Restricted cash	0	0
Equity securities	0	0
Enhanced equipment trust certificates (EETC)	0	0
Avianca Holdings S.A. (AVH) Derivative Assets	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Restricted cash	0	0
Equity securities	0	0
Enhanced equipment trust certificates (EETC)	16	18
Avianca Holdings S.A. (AVH) Derivative Assets	14	11
Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	1,014	1,023
Corporate debt \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Corporate debt \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	1,014	1,023
Corporate debt \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	745	746
Asset-backed securities \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Asset-backed securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	745	746
Asset-backed securities \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
U.S. government and agency notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	108	108
U.S. government and agency notes \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
U.S. government and agency notes \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	108	108
U.S. government and agency notes \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Certificates of deposit placed through an account registry service (CDARS)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	45	75
Certificates of deposit placed through an account registry service (CDARS) \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Certificates of deposit placed through an account registry service (CDARS) \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	45	75
Certificates of deposit placed through an account registry service (CDARS) \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Other fixed-income securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	118	116
Other fixed-income securities \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Other fixed-income securities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	118	116
Other fixed-income securities \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Other investments measured at net asset value (NAV)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	189	188
Other investments measured at net asset value (NAV) \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Other investments measured at net asset value (NAV) \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Other investments measured at net asset value (NAV) \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 0	$ 0

Financial Instruments and Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Nov. 30, 2018	Apr. 30, 2018
Synergy
Fair Value [Line Items]
Loan amount		$ 456
Number of shares pledged as loan collateral (in shares)		516,000,000
Azul
Fair Value [Line Items]
Equity stake			2.00%
Azul \| Preferred Stock
Fair Value [Line Items]
Equity stake			8.00%
Asset-Backed Securities \| Minimum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	1 year
Asset-Backed Securities \| Maximum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	16 years
Corporate Debt \| Minimum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	1 year
Corporate Debt \| Maximum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	3 years
CDARS \| Maximum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	1 year
U.S. Government and Other Securities \| Minimum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	1 year
Other Fixed-Income Securities \| Maximum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	2 years

Financial Instruments and Fair Value Measurements - Carrying Values and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 13,935	$ 13,445
Synergy Term Loan	480	478
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	14,136	13,450
Synergy Term Loan	422	422
Level 1 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	0
Synergy Term Loan	0	0
Level 2 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	10,307	9,525
Synergy Term Loan	0	0
Level 3 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	3,829	3,925
Synergy Term Loan	$ 422	$ 422

Leases - Components of Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Leases [Abstract]
Operating lease cost	$ 272	$ 326
Variable and short-term lease cost	606	611
Amortization of finance lease assets	18	23
Interest on finance lease liabilities	27	5
Sublease income	(8)	(10)
Total lease cost	$ 915	$ 955

Leases - Narrative (Details) $ in Millions	3 Months Ended
Leases - Narrative (Details) $ in Millions	Mar. 31, 2019 USD ($) aircraft
Lessee, Lease, Description [Line Items]
Additional leases that have not yet commenced \| $	$ 140
Maximum
Lessee, Lease, Description [Line Items]
Lease terms of additional leases that have not yet commenced (up to)	34 years
Mainline Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft subject to operating leases	122
Number of aircraft subject to finance leases	30
Mainline Aircraft \| Minimum
Lessee, Lease, Description [Line Items]
Initial term of operating leases	2 months
Mainline Aircraft \| Maximum
Lessee, Lease, Description [Line Items]
Initial term of operating leases	10 years
Regional Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft subject to operating leases	341
Number of aircraft subject to finance leases	76
Non-Aircraft \| Minimum
Lessee, Lease, Description [Line Items]
Initial term of operating leases	1 month
Non-Aircraft \| Maximum
Lessee, Lease, Description [Line Items]
Initial term of operating leases	34 years

Leases - Summary of Scheduled Future Minimum Lease Payments under Operating and Finance Leases (Details) - USD ($)
$ in Millions

Mar. 31, 2019

Dec. 31, 2018

^[1]

Operating Leases

Last nine months of 2019

$ 662

985

763

630

617

4,252

Minimum lease payments

7,909

Imputed interest

2,125

5,784

Less: current maturities of lease obligations

(639)

$ (719)

Long-term lease obligations

5,145

5,276

Finance Leases

Last nine months of 2019

195

Minimum lease payments

514

Imputed interest

145

Present value of minimum lease payments

369

Less: current maturities of lease obligations

(133)

(123)

Long-term lease obligations

$ 236

$ 224

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Leases - Additional Information Related to Leases (Details) - aircraft	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term - finance leases	5 years	5 years
Weighted-average remaining lease term - operating leases	10 years	10 years
Weighted-average discount rate - finance leases	50.50%	6.70%
Weighted-average discount rate - operating leases	5.20%	5.00%
Embraer ERJ 145
Lessee, Lease, Description [Line Items]
Number of leased aircraft			54

Leases - Supplemental Cash Flow Information Related to Leases (Details) - USD ($)
$ in Millions

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

Cash paid for amounts included in the measurement of lease liabilities:

Operating cash flows for operating leases

$ 285

$ 279

Operating cash flows for finance leases

Financing cash flows for finance leases

$ 20

$ 18

^[1]

[1]	Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

Commitments and Contingencies - Firm Commitments and Options to Purchase Aircraft (Details)	Mar. 31, 2019 commitment
Airbus A350
Long-term Purchase Commitment [Line Items]
Number of firm commitments	45
Boeing 737 MAX
Long-term Purchase Commitment [Line Items]
Number of firm commitments	171
Boeing 777-300ER
Long-term Purchase Commitment [Line Items]
Number of firm commitments	4
Boeing 787
Long-term Purchase Commitment [Line Items]
Number of firm commitments	20
Embraer E175
Long-term Purchase Commitment [Line Items]
Number of firm commitments	25

Commitments and Contingencies - Narrative (Details) $ / shares in Units, employee in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) aircraft employee commitment	Dec. 31, 2019 aircraft	Mar. 13, 2019 aircraft	Mar. 12, 2019 aircraft	Nov. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2018 aircraft
Commitments and Contingencies [Line Items]
Remaining term of debt	12 years
United Airlines, Inc.
Commitments and Contingencies [Line Items]
Number of employees \| employee	93
Percentage of employees represented by various U.S. labor organizations	84.00%
Kingsland
Commitments and Contingencies [Line Items]
Number of shares that may be put to United (in shares) \| shares					144,800,000.0
Number of ADRs that may be put into United (in shares) \| shares					18,100,000
Market price of common stock at fifth anniversary (in dollars per share) \| $ / shares					$ 12
Aggregate maximum possible combined put payment and guarantee amount \| $					$ 217
Liability for the fair value of guarantees \| $					$ 31
Tax-Exempt Special Facilities Revenue Bonds
Commitments and Contingencies [Line Items]
Aggregate principal amount of guarantee \| $	$ 1,900
Floating Rate Debt
Commitments and Contingencies [Line Items]
Debt \| $	3,400
Fixed Rate Debt
Commitments and Contingencies [Line Items]
Debt \| $	$ 18
Loans and Leases from Non-U.S. Entities
Commitments and Contingencies [Line Items]
Remaining term of debt	12 years
Aggregate balance \| $	$ 3,200
Aircraft Mortgage Debt
Commitments and Contingencies [Line Items]
Aggregate principal amount of guarantee \| $	$ 142
Embraer E175
Commitments and Contingencies [Line Items]
Number of aircraft expected to take delivery of in 2019	25
Number of aircraft committed to purchase \| commitment	25
Boeing 737 MAX
Commitments and Contingencies [Line Items]
Number of aircraft expected to take delivery of in 2019	16
Number of aircraft expected to take delivery of in 2020	28
Number of aircraft committed to purchase \| commitment	171
Number of aircraft grounded under emergency order			14
Number of flights operated using grounded aircraft				50
Boeing 737 MAX \| Forecast
Commitments and Contingencies [Line Items]
Number of expected flights operating per day prior to grounding order		110
Boeing 787
Commitments and Contingencies [Line Items]
Number of aircraft expected to take delivery of in 2019	4
Number of aircraft expected to take delivery of in 2020	15
Number of aircraft committed to purchase \| commitment	20
Boeing 777-300ER
Commitments and Contingencies [Line Items]
Number of aircraft expected to take delivery of in 2019	2
Number of aircraft expected to take delivery of in 2020	2
Airbus A319
Commitments and Contingencies [Line Items]
Number of aircraft committed to purchase	20
Embraer ERJ 145
Commitments and Contingencies [Line Items]
Number of leased aircraft						54

Commitments and Contingencies - Summary of Commitments (Details) $ in Billions	Mar. 31, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Last nine months of 2019	$ 2.5
2020	5.4
2021	3.7
2022	3.1
2023	2.0
After 2023	7.0
Total commitments	$ 23.7

Debt - Narrative (Details)	1 Months Ended
Debt - Narrative (Details)	Feb. 28, 2019 trust	Mar. 31, 2019 USD ($)
Debt Instrument [Line Items]
Number of pass-through trusts created \| trust	2
Revolving Credit Facility \| United Airlines, Inc. \| Secured Debt
Debt Instrument [Line Items]
Available under revolving credit facility \| $		$ 2,000,000,000

Debt - Details of Pass Through Trusts (Details) - USD ($)

3 Months Ended

Mar. 31, 2019

Mar. 31, 2018

$ 646,000,000

$ 673,000,000

^[1]

United Airlines, Inc. | Class AA Pass Through Certificates | February 2019

646,000,000

$ 673,000,000

^[2]

Principal

$ 717,000,000

Stated interest rate

4.15%

Total debt recorded

$ 522,000,000

Remaining proceeds from issuance of debt to be received in future periods

522,000,000

195,000,000

United Airlines, Inc. | Class A Pass Through Certificates | February 2019

Principal

$ 296,000,000

Stated interest rate

4.55%

Total debt recorded

$ 216,000,000

Remaining proceeds from issuance of debt to be received in future periods

216,000,000

80,000,000

United Airlines, Inc. | ETTC

Principal

1,013,000,000

Total debt recorded

738,000,000