View Filing Data

$ 11,402

$ 10,777

^[1]

$ 20,991

$ 19,809

^[1]

3,057

2,878

^[1]

5,930

5,604

^[1]

2,385

2,390

^[1]

4,408

4,355

^[1]

715

693

^[1]

1,403

1,323

^[1]

660

625

^[1]

1,248

1,204

^[1]

560

538

^[1]

1,107

1,062

^[1]

421

438

^[1]

829

878

^[1]

442

393

^[1]

802

735

^[1]

119

^[1]

154

246

^[1]

129

^[1]

169

^[1]

1,546

1,429

^[1]

3,054

2,826

^[1]

9,930

9,632

^[1]

19,024

18,402

^[1]

1,472

1,145

^[1]

1,967

1,407

^[1]

(191)

(163)

^[1]

(379)

(325)

^[1]

^[1]

^[1]

(164)

^[1]

(117)

^[1]

(118)

(290)

^[1]

(246)

(370)

^[1]

1,354

855

^[1]

1,721

1,037

^[1]

302

172

^[1]

377

209

^[1]

$ 1,052

$ 683

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

$ 1,344

$ 828

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

$ 4.03

$ 2.48

^[1]

$ 5.09

$ 2.96

^[1]

$ 4.02

$ 2.48

^[1]

$ 5.07

$ 2.95

^[1]

$ 11,402

$ 10,777

^[4]

$ 20,991

$ 19,809

^[4]

3,057

2,878

^[4]

5,930

5,604

^[4]

2,385

2,390

^[4]

4,408

4,355

^[4]

715

693

^[4]

1,403

1,323

^[4]

660

625

^[4]

1,248

1,204

^[4]

560

538

^[4]

1,107

1,062

^[4]

421

438

^[4]

829

878

^[4]

442

393

^[4]

802

735

^[4]

119

^[4]

154

246

^[4]

129

^[4]

169

^[4]

1,546

1,428

^[4]

3,053

2,825

^[4]

9,930

9,631

^[4]

19,023

18,401

^[4]

1,472

1,146

^[4]

1,968

1,408

^[4]

(191)

(163)

^[4]

(379)

(325)

^[4]

^[4]

^[4]

(164)

^[4]

(117)

^[4]

(118)

(290)

^[4]

(246)

(370)

^[4]

1,354

856

^[4]

1,722

1,038

^[4]

302

173

^[4]

377

210

^[4]

1,052

683

^[4],[5]

1,345

828

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

Passenger revenue

Passenger revenue | United Airlines, Inc.

10,486

9,880

^[1]

19,211

18,030

^[1]

10,486

9,880

^[4]

19,211

18,030

^[4]

Cargo

Cargo | United Airlines, Inc.

295

314

^[1]

581

607

^[1]

295

314

^[4]

581

607

^[4]

Other operating revenue

Other operating revenue | United Airlines, Inc.

621

583

^[1]

1,199

1,172

^[1]

$ 621

$ 583

^[4]

$ 1,199

$ 1,172

^[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

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

$ 1,052

$ 683

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

$ 1,344

$ 828

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

(17)

^[1]

(10)

^[1]

Total other comprehensive income (loss), net of tax

^[1]

(4)

^[1]

(14)

^[1]

(4)

^[1]

1,038

695

^[1]

1,340

866

^[1]

1,052

683

^[4],[5]

1,345

828

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

(17)

^[4]

(10)

^[4]

Total other comprehensive income (loss), net of tax

^[4]

(4)

^[4]

(14)

^[4]

(4)

^[4]

$ 1,038

$ 695

^[4]

$ 1,341

$ 866

^[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.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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

Jun. 30, 2019

Dec. 31, 2018

$ 3,221

$ 1,694

^[1]

Receivables, less allowance for doubtful accounts (2019 — $9; 2018 — $8)

2,223

2,256

^[1]

1,762

1,426

^[1]

Aircraft fuel, spare parts and supplies, less obsolescence allowance (2019 — $387; 2018 — $412)

996

985

^[1]

708

733

^[1]

8,910

7,094

^[1]

33,890

32,599

^[1]

7,371

6,889

^[1]

1,351

1,177

^[1]

42,612

40,665

^[1]

(13,694)

(13,266)

^[1]

28,918

27,399

^[1]

4,908

5,262

^[1]

Intangibles, less accumulated amortization (2019 — $1,410; 2018 — $1,380)

4,523

^[1]

3,129

3,159

^[1]

105

^[1]

518

516

^[1]

1,139

966

^[1]

9,414

9,269

^[1]

52,150

49,024

^[1]

3,033

2,363

^[1]

1,871

2,184

^[1]

1,255

1,230

^[1]

117

123

^[1]

637

719

^[1]

604

553

^[1]

16,078

13,839

^[1]

12,938

12,215

^[1]

202

224

^[1]

5,034

5,276

^[1]

1,277

1,295

^[1]

1,366

1,576

^[1]

1,192

828

^[1]

980

1,010

^[1]

7,578

7,428

^[1]

^[1]

Common stock at par, $0.01 par value; authorized 1,000,000,000 shares; outstanding 257,729,166 and 269,914,769 shares at June 30, 2019 and December 31, 2018, respectively

Preferred stock

^[1]

^[1]

6,096

6,120

^[1]

Stock held in treasury, at cost

8,050

6,715

^[1]

(3,022)

(1,993)

^[1]

(807)

(803)

^[1]

10,320

10,042

^[1],[2]

52,150

49,024

^[1]

3,215

1,688

^[3]

Receivables, less allowance for doubtful accounts (2019 — $9; 2018 — $8)

2,223

2,256

^[3]

1,762

1,426

^[3]

Aircraft fuel, spare parts and supplies, less obsolescence allowance (2019 — $387; 2018 — $412)

996

985

^[3]

708

733

^[3]

8,904

7,088

^[3]

33,890

32,599

^[3]

7,371

6,889

^[3]

1,351

1,177

^[3]

42,612

40,665

^[3]

(13,694)

(13,266)

^[3]

28,918

27,399

^[3]

4,908

5,262

^[3]

Intangibles, less accumulated amortization (2019 — $1,410; 2018 — $1,380)

4,523

^[3]

3,129

3,159

^[3]

105

^[3]

518

516

^[3]

1,139

966

^[3]

9,414

9,269

^[3]

52,144

49,018

^[3]

3,033

2,363

^[3]

1,871

2,184

^[3]

1,255

1,230

^[3]

117

123

^[3]

637

719

^[3]

608

558

^[3]

16,082

13,844

^[3]

12,938

12,215

^[3]

202

224

^[3]

5,034

5,276

^[3]

1,277

1,295

^[3]

1,366

1,576

^[3]

1,220

855

^[3]

980

1,010

^[3]

7,606

7,455

^[3]

^[3]

Common stock at par, $0.01 par value; authorized 1,000,000,000 shares; outstanding 257,729,166 and 269,914,769 shares at June 30, 2019 and December 31, 2018, respectively

^[3]

598

^[3]

11,230

10,319

^[3]

Receivable from related parties

(807)

(803)

^[3]

(141)

(110)

^[3]

10,282

10,004

^[3],[4]

52,144

49,018

^[3]

Advance ticket sales

Advance ticket sales | United Airlines, Inc.

6,126

4,381

^[1]

6,126

4,381

^[3]

2,435

2,286

^[1]

Frequent flyer deferred revenue | United Airlines, Inc.

2,763

2,719

^[1]

2,435

2,286

^[3]

$ 2,763

$ 2,719

^[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	Jun. 30, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 9	$ 8
Obsolescence allowance for aircraft fuel, spare parts and supplies	387	412
Accumulated amortization on intangibles	$ 1,410	$ 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)	257,729,166	269,914,769
United Airlines, Inc.
Allowance for doubtful accounts	$ 9	$ 8
Obsolescence allowance for aircraft fuel, spare parts and supplies	387	412
Accumulated amortization on intangibles	$ 1,410	$ 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

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

$ 4,625

$ 4,152

^[1]

(2,467)

(1,671)

^[1]

Proceeds from sale of short-term and other investments

(1,443)

(1,326)

^[1]

1,484

1,455

^[1]

(27)

(139)

^[1]

(10)

^[1]

^[1]

(2,436)

(1,653)

^[1]

996

1,241

^[1]

(473)

(1,294)

^[1]

(1,062)

(969)

^[1]

(63)

(35)

^[1]

(30)

(25)

^[1]

(30)

(17)

^[1]

Net increase in cash, cash equivalents and restricted cash

(662)

(1,099)

^[1]

1,527

1,400

^[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]

3,326

2,991

^[1]

Investing and Financing Activities Not Affecting Cash:

Property and equipment acquired through the issuance of debt

220

125

^[1]

Right-of-use assets acquired through operating leases

^[1]

103

^[1]

Property and equipment acquired through finance leases

^[1]

4,596

4,135

^[3]

(2,467)

(1,671)

^[3]

Proceeds from sale of short-term and other investments

(1,443)

(1,326)

^[3]

1,484

1,455

^[3]

(27)

(139)

^[3]

(10)

^[3]

^[3]

(2,436)

(1,653)

^[3]

996

1,241

^[3]

(473)

(1,294)

^[3]

(1,062)

(969)

^[3]

(63)

(35)

^[3]

(30)

(25)

^[3]

(1)

^[3]

Net increase in cash, cash equivalents and restricted cash

(633)

(1,082)

^[3]

1,527

1,400

^[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]

3,320

2,985

^[3]

Investing and Financing Activities Not Affecting Cash:

Property and equipment acquired through the issuance of debt

220

125

^[3]

Right-of-use assets acquired through operating leases

^[3]

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	$	3,221	$	2,884
Restricted cash (included in Prepaid expenses and other)	—		13
Restricted cash	105		94
Total cash, cash equivalents and restricted cash	$	3,326	$	2,991

[3]

[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	$	3,215	$	2,878
Restricted cash (included in Prepaid expenses and other)	—		13
Restricted cash	105		94
Total cash, cash equivalents and restricted cash	$	3,320	$	2,985

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

Jun. 30, 2019

Dec. 31, 2018

Jun. 30, 2018

Reconciliation of cash, cash equivalents and restricted cash:

Restricted cash (included in Prepaid expenses and other)

$ 3,221

$ 1,694

^[1]

$ 2,884

105

^[1]

3,326

^[2]

1,799

2,991

^[2],[3]

Reconciliation of cash, cash equivalents and restricted cash:

Restricted cash (included in Prepaid expenses and other)

3,215

1,688

^[4]

2,878

105

^[4]

Balance (in shares) at Dec. 31, 2017

$ 3,320

^[5]

$ 1,793

$ 2,985

^[5],[6]

[1]

[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	$	3,221	$	2,884
Restricted cash (included in Prepaid expenses and other)	—		13
Restricted cash	105		94
Total cash, cash equivalents and restricted cash	$	3,326	$	2,991

[3]

[4]

[5]

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	$	3,215	$	2,878
Restricted cash (included in Prepaid expenses and other)	—		13
Restricted cash	105		94
Total cash, cash equivalents and restricted cash	$	3,320	$	2,985

[6]

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

Total

Common Stock

Additional Capital Invested

Treasury Stock

Retained Earnings

Accumulated Other Comprehensive Income (Loss)

United Airlines, Inc.

Additional Capital Invested

United Airlines, Inc.

Retained Earnings

United Airlines, Inc.

Accumulated Other Comprehensive Income (Loss)

United Airlines, Inc.

Receivable from Related Parties, Net

^[1]

287,000,000.0

Balance at Dec. 31, 2017

$ 8,788

^[1]

$ 3

^[1]

$ 6,098

^[1]

$ (769)

^[1]

$ 4,603

^[1]

$ (1,147)

^[1]

$ 8,751

^[2]

$ 1,787

^[2]

$ 8,201

^[2]

$ (1,147)

^[2]

$ (90)

^[2]

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

828

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

828

^[1]

828

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

828

^[3]

^[6]

(976)

(14,200,000)

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

(976)

200,000

(16)

(36)

(5)

(17)

(7)

(18)

^[1]

273,000,000.0

Balance (in shares) at Mar. 31, 2018

8,691

^[1]

$ 3

^[1]

6,091

^[1]

(1,720)

^[1]

5,419

^[1]

(1,102)

^[1]

8,653

^[2]

841

^[2]

9,022

^[2]

(1,102)

^[2]

(108)

^[2]

^[1]

279,400,000

Balance at Mar. 31, 2018

8,388

^[1]

$ 3

^[1]

6,077

^[1]

(1,314)

^[1]

4,736

^[1]

(1,114)

^[1]

8,350

^[2]

1,233

^[2]

8,339

^[2]

(1,114)

^[2]

(108)

^[2]

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

683

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

683

^[1]

683

^[5],[6]

683

^[3]

^[6]

(407)

(6,400,000)

(407)

^[1]

273,000,000.0

Balance (in shares) at Dec. 31, 2018

$ 8,691

^[1]

$ 3

^[1]

6,091

^[1]

(1,720)

^[1]

5,419

^[1]

(1,102)

^[1]

$ 8,653

^[2]

841

^[2]

9,022

^[2]

(1,102)

^[2]

(108)

^[2]

269,914,769

269,900,000

^[1]

1,000

Balance at Dec. 31, 2018

$ 10,042

^[1],[7]

$ 3

^[1]

6,120

^[1]

(1,993)

^[1]

6,715

^[1]

(803)

^[1]

$ 10,004

^[2],[8]

598

^[2]

10,319

^[2]

(803)

^[2]

(110)

^[2]

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

1,344

1,345

(4)

(1,063)

(629)

(434)

(12,700,000)

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

(1,063)

500,000

$ (30)

(55)

(9)

$ (31)

(31)

257,729,166

257,700,000

1,000

Balance (in shares) at Mar. 31, 2019

$ 10,320

$ 3

6,096

(3,022)

8,050

(807)

$ 10,282

11,230

(807)

(141)

264,300,000

Balance at Mar. 31, 2019

9,802

$ 3

6,080

(2,487)

6,999

(793)

9,763

^[2]

10,612

^[2]

(793)

^[2]

(140)

^[2]

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

1,052

(14)

(536)

(102)

(434)

(6,600,000)

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

(536)

$ (1)

(1)

$ 0

(1)

257,729,166

257,700,000

1,000

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

$ 10,320

$ 3

$ 6,096

$ (3,022)

$ 8,050

$ (807)

$ 10,282

$ 0

$ 11,230

$ (807)

$ (141)

[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

6 Months Ended

Jun. 30, 2019

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 (in millions, except per share amounts):



	Three Months Ended June 30, 2018									Six Months Ended June 30, 2018
	As Reported			New Lease Standard Adjustments			As Adjusted			As Reported			New Lease Standard Adjustments			As Adjusted
Regional capacity purchase	$	681		$	12		$	693		$	1,300		$	23		$	1,323
Landing fees and other rent	603			22			625			1,161			43			1,204
Depreciation and amortization	557			(19		)	538			1,098			(36		)	1,062
Interest expense	(177		)	14			(163		)	(353		)	28			(325		)
Interest capitalized	14			(2		)	12			33			(3		)	30
Net income	684			(1		)	683			831			(3		)	828
Earnings per share, basic	2.49			(0.01		)	2.48			2.97			(0.01		)	2.96
Earnings per share, diluted	2.48			—			2.48			2.96			(0.01		)	2.95

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 (in millions):



	December 31, 2018
	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
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 (in millions):



	Six Months Ended June 30, 2018
	As Reported			New Lease Standard Adjustments			As Adjusted
Cash Flows from Operating Activities:
Net cash provided by operating activities	$	4,175		$	(23	)	$	4,152

Cash Flows from Investing Activities:
Capital expenditures	(1,734		)	63			(1,671		)

Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt	1,308			(67		)	1,241
Principal payments under finance leases	(62		)	27			(35		)

The adoption of the New Lease Standard primarily resulted in the recording of assets and liabilities 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 and early adoption is permitted as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is evaluating the impact the adoption of ASU 2016-13 will have on its consolidated financial statements.

Revenue

6 Months Ended

Jun. 30, 2019

REVENUE

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Domestic (U.S. and Canada)	$	7,087	$	6,689	$	12,962	$	12,165
Atlantic	2,066		1,965		3,524		3,354
Pacific	1,306		1,285		2,587		2,516
Latin America	943		838		1,918		1,774
Total	$	11,402	$	10,777	$	20,991	$	19,809

Advance Ticket Sales. All tickets sold at any given point of time have travel dates extending up to 12 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 12 months. In the three and six months ended June 30, 2019, the Company recognized approximately $3.9 billion and $3.2 billion, respectively, and in the three and six months ended June 30, 2018, the Company recognized approximately $3.5 billion and $2.9 billion, respectively, of passenger revenue for tickets that were included in Advance ticket sales at the beginning of those periods.

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 $636 million and $1.2 billion of ancillary fees within passenger revenue in the three and six months ended June 30, 2019, respectively. The Company recorded $555 million and $1.1 billion of ancillary fees within passenger revenue in the three and six months ended June 30, 2018, respectively.

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



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Total Frequent flyer deferred revenue - beginning balance	$	5,138		$	4,937		$	5,005		$	4,783
Miles awarded	682			607			1,289			1,210
Travel miles redeemed (Passenger revenue)	(589		)	(519		)	(1,027		)	(928		)
Non-travel miles redeemed (Other operating revenue)	(33		)	(36		)	(69		)	(76		)
Total Frequent flyer deferred revenue - ending balance	$	5,198		$	4,989		$	5,198		$	4,989

In the three and six months ended June 30, 2019, the Company recognized, in Other operating revenue, $499 million and $972 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 Company recognized $480 million and $974 million, respectively, in the three and six months ended June 30, 2018, related to those revenues. 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

6 Months Ended

Jun. 30, 2019

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 June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Earnings available to common stockholders	$	1,052	$	683	$	1,344	$	828

Basic weighted-average shares outstanding	260.8		274.7		263.9		279.3
Effect of employee stock awards	0.8		0.9		1.0		0.9
Diluted weighted-average shares outstanding	261.6		275.6		264.9		280.2

Earnings per share, basic	$	4.03	$	2.48	$	5.09	$	2.96
Earnings per share, diluted	$	4.02	$	2.48	$	5.07	$	2.95

In the three and six months ended June 30, 2019, UAL repurchased approximately 6.4 million and 12.7 million shares, respectively, of UAL common stock in open market transactions for $0.5 billion and $1.1 billion, respectively. As of June 30, 2019, the Company had approximately $0.7 billion remaining to purchase shares under its December 2017 repurchase authorization. On July 15, 2019, UAL’s Board of Directors authorized a new $3.0 billion share repurchase program to acquire UAL’s common stock. 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)

6 Months Ended

Jun. 30, 2019

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 March 31, 2019	$	(654	)		$	1		$	(140	)	$	(793	)
Changes in value	(29		)		2			7			(20		)
Amounts reclassified to earnings	8				—			(2		)	6
Balance at June 30, 2019	$	(675	)		$	3		$	(135	)	$	(807	)
Balance at December 31, 2018	$	(663	)		$	(4	)	$	(136	)	$	(803	)
Changes in value	(24		)		7			4			(13		)
Amounts reclassified to earnings	12			(a)	—			(3		)	9
Balance at June 30, 2019	$	(675	)		$	3		$	(135	)	$	(807	)

Balance at March 31, 2018	$	(1,063	)		$	(3	)	$	(48	)	$	(1,114	)
Changes in value	1				1			—			2
Amounts reclassified to earnings	14				—			(4		)	10
Balance at June 30, 2018	$	(1,048	)		$	(2	)	$	(52	)	$	(1,102	)
Balance at December 31, 2017	$	(1,102	)		$	(6	)	$	(39	)	$	(1,147	)
Changes in value	24				(3		)	(6		)	15
Amounts reclassified to earnings	30			(a)	—			(7		)	23
Amounts reclassified to retained earnings	—				7			—			7
Balance at June 30, 2018	$	(1,048	)		$	(2	)	$	(52	)	$	(1,102	)

(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	6 Months Ended
Income Taxes	Jun. 30, 2019
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXESThe Company's effective tax rate for the three and six months ended June 30, 2019 was 22.3% and 21.9%, respectively. The effective tax rate for the three and six months ended June 30, 2018 was 20.1% and 20.2%, 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

6 Months Ended

Jun. 30, 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 June 30 (in millions):



	Pension Benefits						Other Postretirement Benefits						Affected Line Item in the Statements of Consolidated Operations
	2019			2018			2019			2018
Service cost	$	46		$	57		$	3		$	3		Salaries and related costs
Interest cost	57			54			14			15			Miscellaneous, net
Expected return on plan assets	(73		)	(73		)	(1		)	—			Miscellaneous, net
Amortization of unrecognized (gain) loss	29			32			(15		)	(8		)	Miscellaneous, net
Amortization of prior service credit	—			—			(9		)	(10		)	Miscellaneous, net
Settlement loss	3			—			—			—			Miscellaneous, net
Total	$	62		$	70		$	(8	)	$	—

The Company's net periodic benefit cost includes the following components for the six months ended June 30 (in millions):



	Pension Benefits						Other Postretirement Benefits						Affected Line Item in the Statements of Consolidated Operations
	2019			2018			2019			2018
Service cost	$	92		$	114		$	5		$	6		Salaries and related costs
Interest cost	114			108			29			30			Miscellaneous, net
Expected return on plan assets	(145		)	(146		)	(1		)	—			Miscellaneous, net
Amortization of unrecognized (gain) loss	58			65			(30		)	(16		)	Miscellaneous, net
Amortization of prior service credit	—			—			(19		)	(19		)	Miscellaneous, net
Settlement loss	3			—			—			—			Miscellaneous, net
Total	$	122		$	141		$	(16	)	$	1

During the three and six months ended June 30, 2019, the Company contributed $150 million and $300 million, respectively, to its U.S. domestic tax-qualified defined benefit pension plans.

Share-Based Compensation. In the six months ended June 30, 2019, UAL granted share-based compensation awards pursuant to the United Continental Holdings, Inc. 2017 Incentive Compensation Plan. These share-based compensation awards include 1.1 million restricted stock units ("RSUs"), consisting of 0.8 million time-vested RSUs and 0.3 million performance-based RSUs. The time-vested RSUs vest pro-rata, on February 28th of each year, over a period of three years 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. 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 June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Share-based compensation expense	$	21	$	27	$	37	$	44

	June 30, 2019		December 31, 2018
Unrecognized share-based compensation	$	110	$	68

BRW Term Loan	6 Months Ended
BRW Term Loan	Jun. 30, 2019
Receivables [Abstract]
BRW TERM LOAN	BRW TERM LOAN In November 2018, United, as lender, entered into a Term Loan Agreement (the "BRW Loan Agreement") with, among others, BRW Aviation Holding LLC and BRW Aviation LLC (“BRW”), as guarantor and borrower, respectively, affiliates of Synergy Aerospace Corporation (“Synergy”), the majority shareholder of Avianca Holdings S.A. (“AVH”), as guarantor and borrower, respectively. Pursuant to the BRW Loan Agreement, United provided a $456 million term loan to BRW (the "BRW Term Loan"), secured by a pledge of BRW's equity, as well as BRW's 516 million shares of common stock of AVH (having an implied value equivalent to 64.5 million American Depositary Receipts ("ADRs"), the class of AVH securities that trades on the New York Stock Exchange (the "NYSE")), the parent company of Aerovías del Continente Americano S.A. BRW is currently in default under the BRW Loan Agreement. On May 13, 2019, S&P Global Ratings downgraded its AVH issuer level credit ratings from B to CCC+, together with accompanying downgrades for AVH’s frequent flyer subsidiary LifeMiles Ltd. ("LifeMiles") and for certain outstanding debt of both AVH and LifeMiles. Following these downgrades, and in order to protect the value of its collateral, on May 24, 2019, United began to exercise remedies available to it under the terms of the BRW Loan Agreement and related documents. In connection with the delivery by United of a notice of default to BRW, Kingsland Holdings Limited ("Kingsland"), AVH’s largest minority shareholder, was granted, in accordance with the agreements related to the BRW Loan Agreement, independent authority to manage BRW, which remains the majority shareholder of AVH. As a result of these developments, United evaluated the $489 million carrying value of the BRW Term Loan as of June 30, 2019 using the fair value of the collateral and determined that the value of the collateral is sufficient to recover the carrying value of the loan and, accordingly, concluded that the BRW Term Loan is not impaired. The fair market value of AVH equity was estimated using an income approach and a market approach with equal weight applied to each approach. Under the income approach, the value was estimated by discounting expected future cash flows at a weighted average cost of capital to a single present value amount. Under the market approach, the value was estimated by reference to multiples of enterprise value to earnings before interest, taxes, depreciation, amortization and rent ("EBITDAR") for a group of publicly-traded market comparable companies, along with AVH's own EBITDAR levels.

Financial Instruments and Fair Value Measurements

6 Months Ended

Jun. 30, 2019

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):



	June 30, 2019								December 31, 2018
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Cash and cash equivalents	$	3,221	$	3,221	$	—	$	—	$	1,694	$	1,694	$	—	$	—
Short-term investments:
Corporate debt	1,053		—		1,053		—		1,023		—		1,023		—
Asset-backed securities	697		—		697		—		746		—		746		—
U.S. government and agency notes	116		—		116		—		108		—		108		—
Certificates of deposit placed through an account registry service ("CDARS")	59		—		59		—		75		—		75		—
Other fixed-income securities	107		—		107		—		116		—		116		—
Other investments measured at net asset value ("NAV")	191		—		—		—		188		—		—		—
Restricted cash	105		105		—		—		105		105		—		—
Long-term investments:
Equity securities	301		301		—		—		249		249		—		—
Enhanced equipment trust certificates ("EETC")	16		—		—		16		18		—		—		18
AVH Derivative Assets (defined below)	10		—		—		10		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 June 30, 2019, asset-backed securities have remaining maturities of less than one year to approximately 15 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 three years 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.

AVH Derivative Assets - As part of the BRW Loan Agreement and related agreements with 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):



	June 30, 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	$	14,193	$	14,691	$	—	$	10,915	$	3,776	$	13,445	$	13,450	$	—	$	9,525	$	3,925

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.
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.

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.

Leases

6 Months Ended

Jun. 30, 2019

Commitments and Contingencies Disclosure [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 and six months ended June 30 included the following components (in millions):



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Operating lease cost	$	259		$	312		$	531		$	638
Variable and short-term lease cost	661			669			1,267			1,280
Amortization of finance lease assets	18			17			36			40
Interest on finance lease liabilities	32			4			59			9
Sublease income	(9		)	(11		)	(17		)	(21		)
Total lease cost	$	961		$	991		$	1,876		$	1,946

Lease terms and commitments. United's leases include aircraft leases for aircraft that are directly leased by United and aircraft that are operated by regional carriers on United's behalf under CPAs (but excluding aircraft owned by United) and non-aircraft leases. Aircraft operating leases relate to leases of 121 mainline and 339 regional aircraft while finance leases relate to leases of 26 mainline and 47 regional aircraft. United's aircraft leases have remaining lease terms of 1 month 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 June 30, 2019 (in millions):



	Operating Leases			Finance Leases
Last six months of 2019	$	428		$	157
2020	989			58
2021	766			54
2022	634			44
2023	621			33
After 2023	4,331			70
Minimum lease payments	7,769			416
Imputed interest	2,098			97
Present value of minimum lease payments	5,671			319
Less: current maturities of lease obligations	(637		)	(117		)
Long-term lease obligations	$	5,034		$	202

As of June 30, 2019, we have additional leases of approximately $570 million for regional jets under a CPA and a maintenance facility that have not yet commenced. 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 June 30:



	2019			2018
Weighted-average remaining lease term - operating leases	10 years			10 years
Weighted-average remaining lease term - finance leases	5 years			5 years
Weighted-average discount rate - operating leases	5.3	%		5.1	%
Weighted-average discount rate - finance leases	53.2	%	(a)	6.7	%

(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 six months ended June 30 (in millions):



	2019		2018
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	507	$	552
Operating cash flows for finance leases	47		9
Financing cash flows for finance leases	63		35

Commitments and Contingencies

6 Months Ended

Jun. 30, 2019

COMMITMENTS AND CONTINGENCIES

Commitments. As of June 30, 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:



		Scheduled Aircraft Deliveries
Aircraft Type	Number of Firm Commitments (a)	Last Six Months of 2019	2020	After 2020
Airbus A350	45	—	—	45
Boeing 737 MAX	171	16	28	127
Boeing 777-300ER	4	2	2	—
Boeing 787	18	2	15	1
Embraer E175	38	18	20	—
(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. United also has agreements to purchase 20 used Airbus A319 aircraft with expected delivery dates through 2022 and 19 used Boeing 737-700 aircraft with expected delivery dates in 2019 through 2021.

On March 13, 2019, the Federal Aviation Administration issued an emergency order prohibiting the operation of Boeing 737 MAX series airplanes by U.S. certificated operators (the "FAA Order"). 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 anticipated delivery schedule, to operate approximately 110 flights a day by the end of the year. The FAA Order also resulted in Boeing suspending delivery of new Boeing 737 MAX series aircraft. The extent of the delay to the scheduled deliveries of the 737 MAX aircraft included in the table above is expected to be impacted by the length of time the FAA Order remains in place, Boeing's production rate and the pace at which Boeing can deliver aircraft following the lifting of the FAA Order, among other factors.

During the second quarter of 2019, the Company placed an order for 20 additional Embraer E175 aircraft which will be operated by a regional carrier.

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. As of June 30, 2019, United had purchased 17 of those aircraft.

The table below summarizes United's commitments as of June 30, 2019, which include aircraft and related spare engines, aircraft improvements and all non-aircraft capital commitments:



	(in billions)
Last six months of 2019	$	2.2
2020 (a)	5.9
2021	4.0
2022	3.3
2023	2.0
After 2023	6.9
	$	24.3

(a) Commitments for 2020 are expected to be higher than other years displayed in the table above due to the large number of wide-body aircraft deliveries (17 new aircraft) scheduled in that year. Amounts are not adjusted for any potential changes in the delivery schedule of the Boeing 737 MAX aircraft.

Regional CPAs. In June 2019, United entered into a ten-year CPA with GoJet Airlines for regional service under the United Express brand to operate 54 CRJ-550 aircraft commencing in the second half of 2019.

The table below summarizes the Company's expected future payments through the end of the terms of our CPAs, excluding aircraft ownership costs and variable pass-through costs such as fuel and landing fees, among others.



	(in billions)
Last six months of 2019	$	1.1
2020	2.1
2021	2.1
2022	1.7
2023	1.1
After 2023	4.4
	$	12.5

Guarantees. As of June 30, 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 9 of this report. All of these bonds are due between 2019 and 2038.

In connection with funding the BRW Loan Agreement, the Company entered into an agreement with Kingsland, pursuant to which, in return for Kingsland's pledge of its 144.8 million shares of AVH common stock (having an implied value equivalent to 18.1 million ADRs) and its consent to Synergy's pledge of its AVH common stock to United under the BRW Loan Agreement and related agreements, 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 BRW 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 NYSE, for an aggregate maximum possible combined put payment and guarantee amount on the fifth anniversary of $217 million. In 2018, the Company recorded a liability of $31 million for the fair value of its guarantee to loan additional funds to Synergy if required. Any such additional loans to Synergy would be collateralized by BRW's shares of AVH stock and other collateral.

Increased Cost Provisions. In United's financing transactions that include loans in which United is the borrower, 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 with respect to 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 June 30, 2019, the Company had $3.4 billion of floating rate debt and $9 million of fixed rate debt with remaining terms of up to 11 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 11 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 June 30, 2019, United is the guarantor of $139 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 June 30, 2019, the Company had approximately 95,000 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 labor 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

6 Months Ended

Jun. 30, 2019

DEBT

As of June 30, 2019, UAL and United were in compliance with their respective debt covenants. As of June 30, 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 (such certificates, the "2019-1 Pass Through Certificates"). The proceeds from the issuance of the pass-through certificates are used to purchase equipment notes issued by United and secured by its aircraft financed with the proceeds of such notes. 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 Issuance Date	Class	Face Amount		Final expected distribution date	Stated interest rate	Total proceeds received from issuance of debt during 2019 and recorded as debt as of June 30, 2019		Remaining proceeds from issuance of certificates to be received in future periods
February 2019	AA	$	717	August 2031	4.15%	$	612	$	105
February 2019	A	296		August 2031	4.55%	253		43
		$	1,013			$	865	$	148

Certain of the proceeds from the issuance of the 2019-1 Pass Through Certificates were expected to be used to purchase equipment notes issued by United and secured by three Boeing 737 MAX aircraft, which aircraft were scheduled for delivery by Boeing in March, April and May of 2019. However, as a result of the FAA Order, United has not yet taken delivery of these three aircraft. If United is not in a position to take delivery of such 737 MAX aircraft on or prior to November 30, 2019, any funds remaining with the depositary in escrow at such time, together with accrued and unpaid interest thereon but without premium, will be distributed to the holders of the 2019-1 Pass Through Certificates.

4.875% Senior Note due 2025. In May 2019, UAL issued $350 million aggregate principal amount of 4.875% Senior Notes due January 15, 2025 (the "4.875% Senior Notes due 2025"), which are fully and unconditionally guaranteed and recorded by United on its balance sheet. The indenture for the 4.875% Senior Notes due 2025 requires that, if certain changes of control of UAL occur, UAL offer to repurchase the 4.875% Senior Notes due 2025 for cash at a purchase price equal to 101% of the principal amount of such notes repurchased plus accrued and unpaid interest.

The table below presents the Company's contractual principal payments (not including debt discount or debt issuance costs) at June 30, 2019 under then-outstanding long-term debt agreements (in millions):



Last six months of 2019	$	757
2020	1,350
2021	1,344
2022	1,697
2023	747
After 2023	8,484
	$	14,379

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

6 Months Ended

Jun. 30, 2019

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

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

For the three and six months ended June 30, special charges and MTM adjustments consisted of the following (in millions):



	Three Months Ended June 30,						Six Months Ended June 30,
Operating:	2019			2018			2019			2018
Impairment of assets	$	61		$	111		$	69		$	134
Severance and benefit costs	6			11			12			25
(Gains) losses on sale of assets and other special charges	4			7			8			10
Total operating special charges	71			129			89			169
Nonoperating MTM (gains) losses on financial instruments	(34		)	135			(51		)	90
Total special charges and MTM (gains) losses on financial instruments	37			264			38			259
Income tax benefit	(8		)	(59		)	(8		)	(58		)
Total special charges and MTM (gains) losses on financial instruments, net of income tax	$	29		$	205		$	30		$	201

2019

During the three months ended June 30, 2019, the Company recorded a $47 million impairment for aircraft engines removed from operations, a $6 million charge for the early termination of several regional aircraft finance leases and $8 million in other miscellaneous impairments. During the six months ended June 30, 2019, in addition to the charges described above, the Company recorded an $8 million fair value adjustment for aircraft purchased off lease.

During the three and six months ended June 30, 2019, the Company recorded management severance of $6 million and $10 million, respectively. During the six months ended June 30, 2019, the Company recorded $2 million of 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"). 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.

During the three and six months ended June 30, 2019, the Company recorded gains of $38 million and $52 million, respectively, for the change in market value of its investment in Azul. Also, during the three and six months ended June 30, 2019, the Company recorded losses of $4 million and $1 million, respectively, for the change in fair value of the AVH Derivative Assets. 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.

2018

In May 2018, the Brazil–United States open skies agreement was ratified, which provides air carriers with unrestricted access between the United States and Brazil. The Company determined that the approval of the open skies agreement impaired the entire value of its Brazil route authorities because the agreement removes all limitations or reciprocity requirements for flights between the United States and Brazil. Accordingly, the Company recorded a $105 million special charge to write off the entire value of the intangible asset associated with its Brazil routes.

During the three and six months ended June 30, 2018, the Company recorded $6 million and $29 million, respectively, of fair value adjustments for aircraft purchased off lease and impairments related to certain fleet types and international slots no longer in use.

During the three and six months ended June 30, 2018, the Company recorded $6 million and $14 million, respectively, of severance and benefit costs related to the early-out program described above and management severance of $5 million and $11 million, respectively.

During the three and six months ended June 30, 2018, the Company recorded losses of $135 million and $90 million, respectively, for the change in market value of its investment in Azul.

Recently Issued Accounting Standards (Policies)

6 Months Ended

Jun. 30, 2019

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recently Issued Accounting Standards



	Three Months Ended June 30, 2018									Six Months Ended June 30, 2018
	As Reported			New Lease Standard Adjustments			As Adjusted			As Reported			New Lease Standard Adjustments			As Adjusted
Regional capacity purchase	$	681		$	12		$	693		$	1,300		$	23		$	1,323
Landing fees and other rent	603			22			625			1,161			43			1,204
Depreciation and amortization	557			(19		)	538			1,098			(36		)	1,062
Interest expense	(177		)	14			(163		)	(353		)	28			(325		)
Interest capitalized	14			(2		)	12			33			(3		)	30
Net income	684			(1		)	683			831			(3		)	828
Earnings per share, basic	2.49			(0.01		)	2.48			2.97			(0.01		)	2.96
Earnings per share, diluted	2.48			—			2.48			2.96			(0.01		)	2.95

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



	December 31, 2018
	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
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 (in millions):



	Six Months Ended June 30, 2018
	As Reported			New Lease Standard Adjustments			As Adjusted
Cash Flows from Operating Activities:
Net cash provided by operating activities	$	4,175		$	(23	)	$	4,152

Cash Flows from Investing Activities:
Capital expenditures	(1,734		)	63			(1,671		)

Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt	1,308			(67		)	1,241
Principal payments under finance leases	(62		)	27			(35		)

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.
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)

6 Months Ended

Jun. 30, 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 (in millions):



	December 31, 2018
	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
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 (in millions):



	Six Months Ended June 30, 2018
	As Reported			New Lease Standard Adjustments			As Adjusted
Cash Flows from Operating Activities:
Net cash provided by operating activities	$	4,175		$	(23	)	$	4,152

Cash Flows from Investing Activities:
Capital expenditures	(1,734		)	63			(1,671		)

Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt	1,308			(67		)	1,241
Principal payments under finance leases	(62		)	27			(35		)

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 (in millions, except per share amounts):



	Three Months Ended June 30, 2018									Six Months Ended June 30, 2018
	As Reported			New Lease Standard Adjustments			As Adjusted			As Reported			New Lease Standard Adjustments			As Adjusted
Regional capacity purchase	$	681		$	12		$	693		$	1,300		$	23		$	1,323
Landing fees and other rent	603			22			625			1,161			43			1,204
Depreciation and amortization	557			(19		)	538			1,098			(36		)	1,062
Interest expense	(177		)	14			(163		)	(353		)	28			(325		)
Interest capitalized	14			(2		)	12			33			(3		)	30
Net income	684			(1		)	683			831			(3		)	828
Earnings per share, basic	2.49			(0.01		)	2.48			2.97			(0.01		)	2.96
Earnings per share, diluted	2.48			—			2.48			2.96			(0.01		)	2.95

Revenue (Tables)

6 Months Ended

Jun. 30, 2019

Operating Revenue by Geographic Region

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Domestic (U.S. and Canada)	$	7,087	$	6,689	$	12,962	$	12,165
Atlantic	2,066		1,965		3,524		3,354
Pacific	1,306		1,285		2,587		2,516
Latin America	943		838		1,918		1,774
Total	$	11,402	$	10,777	$	20,991	$	19,809

Roll Forward of Frequent Flyer Deferred Revenue

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



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Total Frequent flyer deferred revenue - beginning balance	$	5,138		$	4,937		$	5,005		$	4,783
Miles awarded	682			607			1,289			1,210
Travel miles redeemed (Passenger revenue)	(589		)	(519		)	(1,027		)	(928		)
Non-travel miles redeemed (Other operating revenue)	(33		)	(36		)	(69		)	(76		)
Total Frequent flyer deferred revenue - ending balance	$	5,198		$	4,989		$	5,198		$	4,989

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2019

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 June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Earnings available to common stockholders	$	1,052	$	683	$	1,344	$	828

Basic weighted-average shares outstanding	260.8		274.7		263.9		279.3
Effect of employee stock awards	0.8		0.9		1.0		0.9
Diluted weighted-average shares outstanding	261.6		275.6		264.9		280.2

Earnings per share, basic	$	4.03	$	2.48	$	5.09	$	2.96
Earnings per share, diluted	$	4.02	$	2.48	$	5.07	$	2.95

Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2019

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 March 31, 2019	$	(654	)		$	1		$	(140	)	$	(793	)
Changes in value	(29		)		2			7			(20		)
Amounts reclassified to earnings	8				—			(2		)	6
Balance at June 30, 2019	$	(675	)		$	3		$	(135	)	$	(807	)
Balance at December 31, 2018	$	(663	)		$	(4	)	$	(136	)	$	(803	)
Changes in value	(24		)		7			4			(13		)
Amounts reclassified to earnings	12			(a)	—			(3		)	9
Balance at June 30, 2019	$	(675	)		$	3		$	(135	)	$	(807	)

Balance at March 31, 2018	$	(1,063	)		$	(3	)	$	(48	)	$	(1,114	)
Changes in value	1				1			—			2
Amounts reclassified to earnings	14				—			(4		)	10
Balance at June 30, 2018	$	(1,048	)		$	(2	)	$	(52	)	$	(1,102	)
Balance at December 31, 2017	$	(1,102	)		$	(6	)	$	(39	)	$	(1,147	)
Changes in value	24				(3		)	(6		)	15
Amounts reclassified to earnings	30			(a)	—			(7		)	23
Amounts reclassified to retained earnings	—				7			—			7
Balance at June 30, 2018	$	(1,048	)		$	(2	)	$	(52	)	$	(1,102	)

Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2019

Components of Net Periodic Benefit Cost

The Company's net periodic benefit cost includes the following components for the three months ended June 30 (in millions):



	Pension Benefits						Other Postretirement Benefits						Affected Line Item in the Statements of Consolidated Operations
	2019			2018			2019			2018
Service cost	$	46		$	57		$	3		$	3		Salaries and related costs
Interest cost	57			54			14			15			Miscellaneous, net
Expected return on plan assets	(73		)	(73		)	(1		)	—			Miscellaneous, net
Amortization of unrecognized (gain) loss	29			32			(15		)	(8		)	Miscellaneous, net
Amortization of prior service credit	—			—			(9		)	(10		)	Miscellaneous, net
Settlement loss	3			—			—			—			Miscellaneous, net
Total	$	62		$	70		$	(8	)	$	—

The Company's net periodic benefit cost includes the following components for the six months ended June 30 (in millions):



	Pension Benefits						Other Postretirement Benefits						Affected Line Item in the Statements of Consolidated Operations
	2019			2018			2019			2018
Service cost	$	92		$	114		$	5		$	6		Salaries and related costs
Interest cost	114			108			29			30			Miscellaneous, net
Expected return on plan assets	(145		)	(146		)	(1		)	—			Miscellaneous, net
Amortization of unrecognized (gain) loss	58			65			(30		)	(16		)	Miscellaneous, net
Amortization of prior service credit	—			—			(19		)	(19		)	Miscellaneous, net
Settlement loss	3			—			—			—			Miscellaneous, net
Total	$	122		$	141		$	(16	)	$	1

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Share-based compensation expense	$	21	$	27	$	37	$	44

	June 30, 2019		December 31, 2018
Unrecognized share-based compensation	$	110	$	68

Financial Instruments and Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

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):



	June 30, 2019								December 31, 2018
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Cash and cash equivalents	$	3,221	$	3,221	$	—	$	—	$	1,694	$	1,694	$	—	$	—
Short-term investments:
Corporate debt	1,053		—		1,053		—		1,023		—		1,023		—
Asset-backed securities	697		—		697		—		746		—		746		—
U.S. government and agency notes	116		—		116		—		108		—		108		—
Certificates of deposit placed through an account registry service ("CDARS")	59		—		59		—		75		—		75		—
Other fixed-income securities	107		—		107		—		116		—		116		—
Other investments measured at net asset value ("NAV")	191		—		—		—		188		—		—		—
Restricted cash	105		105		—		—		105		105		—		—
Long-term investments:
Equity securities	301		301		—		—		249		249		—		—
Enhanced equipment trust certificates ("EETC")	16		—		—		16		18		—		—		18
AVH Derivative Assets (defined below)	10		—		—		10		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):



	June 30, 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	$	14,193	$	14,691	$	—	$	10,915	$	3,776	$	13,445	$	13,450	$	—	$	9,525	$	3,925

Leases (Tables)

6 Months Ended

Jun. 30, 2019

Summary of Scheduled Future Minimum Lease Payments under Operating Leases

Components of Lease Cost

The Company's lease cost for the three and six months ended June 30 included the following components (in millions):



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Operating lease cost	$	259		$	312		$	531		$	638
Variable and short-term lease cost	661			669			1,267			1,280
Amortization of finance lease assets	18			17			36			40
Interest on finance lease liabilities	32			4			59			9
Sublease income	(9		)	(11		)	(17		)	(21		)
Total lease cost	$	961		$	991		$	1,876		$	1,946

The table below summarizes the Company's scheduled future minimum lease payments under operating and finance leases, recorded on the balance sheet, as of June 30, 2019 (in millions):



	Operating Leases			Finance Leases
Last six months of 2019	$	428		$	157
2020	989			58
2021	766			54
2022	634			44
2023	621			33
After 2023	4,331			70
Minimum lease payments	7,769			416
Imputed interest	2,098			97
Present value of minimum lease payments	5,671			319
Less: current maturities of lease obligations	(637		)	(117		)
Long-term lease obligations	$	5,034		$	202

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 June 30, 2019 (in millions):



	Operating Leases			Finance Leases
Last six months of 2019	$	428		$	157
2020	989			58
2021	766			54
2022	634			44
2023	621			33
After 2023	4,331			70
Minimum lease payments	7,769			416
Imputed interest	2,098			97
Present value of minimum lease payments	5,671			319
Less: current maturities of lease obligations	(637		)	(117		)
Long-term lease obligations	$	5,034		$	202

Additional Information Related to Leases

The table below presents additional information related to our leases as of June 30:



	2019			2018
Weighted-average remaining lease term - operating leases	10 years			10 years
Weighted-average remaining lease term - finance leases	5 years			5 years
Weighted-average discount rate - operating leases	5.3	%		5.1	%
Weighted-average discount rate - finance leases	53.2	%	(a)	6.7	%

Supplemental Cash Flow Information Related to Leases

The table below presents supplemental cash flow information related to leases during the six months ended June 30 (in millions):



	2019		2018
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	507	$	552
Operating cash flows for finance leases	47		9
Financing cash flows for finance leases	63		35

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

Firm Commitments and Options to Purchase Aircraft and Summary of Commitments

As of June 30, 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:



		Scheduled Aircraft Deliveries
Aircraft Type	Number of Firm Commitments (a)	Last Six Months of 2019	2020	After 2020
Airbus A350	45	—	—	45
Boeing 737 MAX	171	16	28	127
Boeing 777-300ER	4	2	2	—
Boeing 787	18	2	15	1
Embraer E175	38	18	20	—
(a) United also has options and purchase rights for additional aircraft.

The table below summarizes United's commitments as of June 30, 2019, which include aircraft and related spare engines, aircraft improvements and all non-aircraft capital commitments:



	(in billions)
Last six months of 2019	$	2.2
2020 (a)	5.9
2021	4.0
2022	3.3
2023	2.0
After 2023	6.9
	$	24.3

Summary of the Expected Future Payments Through the End of the Terms of CPAs



	(in billions)
Last six months of 2019	$	1.1
2020	2.1
2021	2.1
2022	1.7
2023	1.1
After 2023	4.4
	$	12.5

Debt (Tables)

6 Months Ended

Jun. 30, 2019

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 Issuance Date	Class	Face Amount		Final expected distribution date	Stated interest rate	Total proceeds received from issuance of debt during 2019 and recorded as debt as of June 30, 2019		Remaining proceeds from issuance of certificates to be received in future periods
February 2019	AA	$	717	August 2031	4.15%	$	612	$	105
February 2019	A	296		August 2031	4.55%	253		43
		$	1,013			$	865	$	148

Contractual Principal Payments under Long-Term Debt Agreements



Last six months of 2019	$	757
2020	1,350
2021	1,344
2022	1,697
2023	747
After 2023	8,484
	$	14,379

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

6 Months Ended

Jun. 30, 2019

Components of Special Charges

For the three and six months ended June 30, special charges and MTM adjustments consisted of the following (in millions):



	Three Months Ended June 30,						Six Months Ended June 30,
Operating:	2019			2018			2019			2018
Impairment of assets	$	61		$	111		$	69		$	134
Severance and benefit costs	6			11			12			25
(Gains) losses on sale of assets and other special charges	4			7			8			10
Total operating special charges	71			129			89			169
Nonoperating MTM (gains) losses on financial instruments	(34		)	135			(51		)	90
Total special charges and MTM (gains) losses on financial instruments	37			264			38			259
Income tax benefit	(8		)	(59		)	(8		)	(58		)
Total special charges and MTM (gains) losses on financial instruments, net of income tax	$	29		$	205		$	30		$	201

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

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

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

$ 715

$ 693

^[1]

$ 1,403

$ 1,323

^[1]

660

625

^[1]

1,248

1,204

^[1]

560

538

^[1]

1,107

1,062

^[1]

(191)

(163)

^[1]

(379)

(325)

^[1]

^[1]

$ 1,052

$ 683

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

$ 1,344

$ 828

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

$ 4.03

$ 2.48

^[1]

$ 5.09

$ 2.96

^[1]

$ 4.02

$ 2.48

^[1]

$ 5.07

$ 2.95

^[1]

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

$ 681

$ 1,300

603

1,161

557

1,098

(177)

(353)

$ 684

$ 831

$ 2.49

$ 2.97

$ 2.48

$ 2.96

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

$ 12

$ 23

(19)

(36)

(2)

(3)

$ (1)

$ (3)

$ (0.01)

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

$ 0

$ (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

Jun. 30, 2019

Dec. 31, 2018

$ 1,762

$ 1,426

^[1]

708

733

^[1]

Other property and equipment, owned and finance leases

33,890

32,599

^[1]

7,371

6,889

^[1]

Accumulated depreciation and amortization, owned and finance leases

(13,694)

(13,266)

^[1]

4,908

5,262

^[1]

117

123

^[1]

637

719

^[1]

604

553

^[1]

202

224

^[1]

5,034

5,276

^[1]

1,192

828

^[1]

980

1,010

^[1]

$ 8,050

6,715

^[1]

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

1,346

913

Other property and equipment, owned and finance leases

32,636

7,930

Accumulated depreciation and amortization, owned and finance leases

(13,414)

149

619

1,134

814

1,832

6,668

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

(180)

Other property and equipment, owned and finance leases

(37)

(1,041)

Accumulated depreciation and amortization, owned and finance leases

148

5,262

(26)

719

(66)

(910)

5,276

(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

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

$ 4,625

$ 4,152

^[1]

(2,467)

(1,671)

^[1]

996

1,241

^[1]

$ (63)

(35)

^[1]

4,175

(1,734)

1,308

(62)

(23)

(67)

$ 27

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

3 Months Ended

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

Domestic (U.S. and Canada)

$ 11,402

$ 10,777

^[1]

$ 20,991

$ 19,809

^[1]

7,087

6,689

12,962

12,165

Atlantic

2,066

1,965

3,524

3,354

Pacific

1,306

1,285

2,587

2,516

Latin America

Revenue From Contract With Customer [Line Items]

$ 943

$ 838

$ 1,918

$ 1,774

[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

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

Revenue From Contract With Customer [Line Items]

$ 11,402

$ 10,777

^[1]

$ 20,991

$ 19,809

^[1]

Advance Ticket Sales

Revenue recognized

3,900

3,500

3,200

2,900

Ancillary Fees

Revenue From Contract With Customer [Line Items]

Revenue From Contract With Customer [Line Items]

636

555

1,200

1,100

Frequent Flyer

$ 499

$ 480

$ 972

$ 974

[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) - Frequent Flyer - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Frequent Flyer Deferred Revenue [Roll Forward]
Total Frequent flyer deferred revenue - beginning balance	$ 5,138	$ 4,937	$ 5,005	$ 4,783
Miles awarded	682	607	1,289	1,210
Travel miles redeemed (Passenger revenue)	(589)	(519)	(1,027)	(928)
Non-travel miles redeemed (Other operating revenue)	(33)	(36)	(69)	(76)
Total Frequent flyer deferred revenue - ending balance	$ 5,198	$ 4,989	$ 5,198	$ 4,989

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

3 Months Ended

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

Earnings available to common stockholders

$ 1,052

$ 683

$ 1,344

$ 828

Basic weighted-average shares outstanding (in shares)

260.8

274.7

263.9

279.3

Effect of employee stock awards (in shares)

0.8

0.9

1.0

0.9

Diluted weighted-average shares outstanding (in shares)

261.6

275.6

264.9

280.2

$ 4.03

$ 2.48

^[1]

$ 5.09

$ 2.96

^[1]

$ 4.02

$ 2.48

^[1]

$ 5.07

$ 2.95

^[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.

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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+ Details

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

Earnings Per Share - Narrative (Details) - USD ($) shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jul. 15, 2019
Earnings Loss Per Share [Line Items]
Repurchases of common stock	$ 536,000,000	$ 407,000,000	$ 1,063,000,000	$ 976,000,000
Open Market Repurchase Program
Earnings Loss Per Share [Line Items]
Number of shares repurchased (in shares)	6.4		12.7
Repurchases of common stock	$ 500,000,000		$ 1,100,000,000
Amount remaining under repurchase programs	$ 700,000,000		$ 700,000,000
Subsequent Event [Member] \| July 2019 Share Repurchase Program [Member]
Earnings Loss Per Share [Line Items]
Authorized amount under share repurchase program					$ 3,000,000,000.0

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

3 Months Ended

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

Deferred Tax

$ (140)

$ (48)

$ (136)

$ (39)

(6)

(2)

(4)

(3)

(7)

(135)

(52)

(135)

(52)

9,802

8,388

^[1]

10,042

^[1],[2]

8,788

^[1]

(20)

(13)

Pension and Other Postretirement Liabilities

10,320

8,691

^[1]

10,320

8,691

^[1]

(654)

(1,063)

(663)

(1,102)

(29)

(24)

(675)

(1,048)

(675)

(1,048)

Investments and Other

(3)

(4)

(6)

(3)

Accumulated Other Comprehensive Income (Loss)

(2)

(793)

(1,114)

^[1]

(803)

^[1]

(1,147)

^[1]

$ (807)

$ (1,102)

^[1]

$ (807)

$ (1,102)

^[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.
[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		6 Months Ended
Income Taxes (Details)	Jun. 30, 2019	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	22.30%	20.10%	21.90%	20.20%

Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 46	$ 57	$ 92	$ 114
Interest cost	57	54	114	108
Expected return on plan assets	(73)	(73)	(145)	(146)
Amortization of unrecognized (gain) loss	29	32	58	65
Amortization of prior service credit	0	0	0	0
Settlement loss	3	0	3	0
Total	62	70	122	141
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	5	6
Interest cost	14	15	29	30
Expected return on plan assets	(1)	0	(1)	0
Amortization of unrecognized (gain) loss	(15)	(8)	(30)	(16)
Amortization of prior service credit	(9)	(10)	(19)	(19)
Settlement loss	0	0	0	0
Total	$ (8)	$ 0	$ (16)	$ 1

Employee Benefit Plans - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
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)		1.1
Vesting period		3 years
Time-Vested RSUs
Compensation and Retirement Disclosure [Abstract]
Awards granted (in shares)		0.8
Performance-Based RSUs
Compensation and Retirement Disclosure [Abstract]
Awards granted (in shares)		0.3
Pension Benefits
Compensation and Retirement Disclosure [Abstract]
Employer contribution to tax-qualified defined benefit pension plans	$ 150	$ 300

Employee Benefit Plans - Information Related to Share-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Employee-related Liabilities [Abstract]
Share-based compensation expense	$ 21	$ 27	$ 37	$ 44
Unrecognized share-based compensation	$ 110		$ 110		$ 68

BRW Term Loan (Details) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2019	Nov. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loan receivable	$ 489
BRW
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan amount		$ 456
Number of shares pledged as collateral (in shares)		516.0
Implied value equivalent of shares pledged as collateral (in ADRs)		64.5

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	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 3,221	$ 1,694
Restricted cash	105	105
Equity securities	301	249
Enhanced equipment trust certificates (EETC)	16	18
AVH Derivative Assets	10	11
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	3,221	1,694
Restricted cash	105	105
Equity securities	301	249
Enhanced equipment trust certificates (EETC)	0	0
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
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
AVH Derivative Assets	10	11
Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	1,053	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	1,053	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	697	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	697	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	116	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	116	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	59	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	59	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	107	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	107	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	191	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)	6 Months Ended
	Jun. 30, 2019
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	15 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	3 years
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	Jun. 30, 2019	Dec. 31, 2018
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 14,193	$ 13,445
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	14,691	13,450
Level 1 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	0
Level 2 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	10,915	9,525
Level 3 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 3,776	$ 3,925

Leases - Components of Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Leases [Abstract]
Operating lease cost	$ 259	$ 312	$ 531	$ 638
Variable and short-term lease cost	661	669	1,267	1,280
Amortization of finance lease assets	18	17	36	40
Interest on finance lease liabilities	32	4	59	9
Sublease income	(9)	(11)	(17)	(21)
Total lease cost	$ 961	$ 991	$ 1,876	$ 1,946

Leases - Narrative (Details) $ in Millions	6 Months Ended
Leases - Narrative (Details) $ in Millions	Jun. 30, 2019 USD ($) aircraft
Lessee, Lease, Description [Line Items]
Additional leases that have not yet commenced \| $	$ 570
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	121
Number of aircraft subject to finance leases	26
Mainline Aircraft \| Minimum
Lessee, Lease, Description [Line Items]
Initial term of operating leases	1 month
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	339
Number of aircraft subject to finance leases	47
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

Jun. 30, 2019

Dec. 31, 2018

^[1]

Operating Leases

$ 428

989

766

634

621

4,331

7,769

2,098

5,671

(637)

$ (719)

5,034

5,276

Finance Leases

157

416

319

(117)

(123)

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

$ 202

$ 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	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term - operating leases	10 years		10 years
Weighted-average remaining lease term - finance leases	5 years		5 years
Weighted-average discount rate - operating leases	5.30%		5.10%
Weighted-average discount rate - finance leases	53.20%		6.70%
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

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Operating cash flows for operating leases

$ 507

$ 552

Operating cash flows for finance leases

Financing cash flows for finance leases

$ 63

$ 35

^[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)	Jun. 30, 2019 commitment Aircraft
Scheduled Aircraft Deliveries
2020 \| Aircraft	17
Airbus A350
Long-term Purchase Commitment [Line Items]
Number of firm commitments	45
Scheduled Aircraft Deliveries
Last Six Months of 2019	0
2020	0
After 2020	45
Boeing 737 MAX
Long-term Purchase Commitment [Line Items]
Number of firm commitments	171
Scheduled Aircraft Deliveries
Last Six Months of 2019	16
2020	28
After 2020	127
Boeing 777-300ER
Long-term Purchase Commitment [Line Items]
Number of firm commitments	4
Scheduled Aircraft Deliveries
Last Six Months of 2019	2
2020	2
After 2020	0
Boeing 787
Long-term Purchase Commitment [Line Items]
Number of firm commitments	18
Scheduled Aircraft Deliveries
Last Six Months of 2019	2
2020	15
After 2020	1
Embraer E175
Long-term Purchase Commitment [Line Items]
Number of firm commitments	38
Scheduled Aircraft Deliveries
Last Six Months of 2019	18
2020	20
After 2020	0

Commitments and Contingencies - Narrative (Details) $ / shares in Units, employee in Thousands, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($) employee commitment aircraft Aircraft	Jun. 30, 2019 USD ($) employee commitment aircraft	Jun. 30, 2019 USD ($) employee commitment aircraft	Dec. 31, 2019 flight	Mar. 13, 2019 aircraft	Mar. 12, 2019 flight	Dec. 31, 2018 USD ($)	Nov. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2018 aircraft
Commitments and Contingencies [Line Items]
Term of capacity purchase agreement	10 years
Remaining term of debt			11 years
Aggregate balance	$ 12,500	$ 12,500	$ 12,500
United Airlines, Inc.
Commitments and Contingencies [Line Items]
Number of employees \| employee	95	95	95
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								144.8
Number of ADRs that may be put into United (in shares) \| shares								18.1
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	$ 1,900	$ 1,900
Floating Rate Debt
Commitments and Contingencies [Line Items]
Debt	3,400	3,400	3,400
Fixed Rate Debt
Commitments and Contingencies [Line Items]
Debt	9	9	$ 9
Loans and Leases from Non-U.S. Entities
Commitments and Contingencies [Line Items]
Remaining term of debt			11 years
Aggregate balance	3,200	3,200	$ 3,200
Aircraft Mortgage Debt
Commitments and Contingencies [Line Items]
Aggregate principal amount of guarantee	$ 139	$ 139	$ 139
Airbus A319
Commitments and Contingencies [Line Items]
Number of aircraft committed to purchase \| aircraft	20	20	20
Boeing 737-700
Commitments and Contingencies [Line Items]
Number of aircraft committed to purchase \| aircraft	19	19	19
Boeing 737 MAX
Commitments and Contingencies [Line Items]
Number of aircraft committed to purchase \| commitment	171	171	171
Number of aircraft grounded under emergency order \| aircraft					14
Number of flights operated using grounded aircraft \| flight						50
Boeing 737 MAX \| Forecast
Commitments and Contingencies [Line Items]
Number of expected flights operating per day prior to grounding order \| flight				110
Embraer E175
Commitments and Contingencies [Line Items]
Number of aircraft committed to purchase \| commitment	38	38	38
Number of aircraft ordered \| aircraft		20
Embraer ERJ 145
Commitments and Contingencies [Line Items]
Number of leased aircraft \| aircraft									54
Number of aircraft purchased \| aircraft									17
Embraer CRJ-550
Commitments and Contingencies [Line Items]
Number of aircraft operated under CPA \| Aircraft	54

Commitments and Contingencies - Summary of Commitments (Details) $ in Billions	Jun. 30, 2019 USD ($) Aircraft
Commitments and Contingencies Disclosure [Abstract]
Last six months of 2019	$ 2.2
2020	5.9
2021	4.0
2022	3.3
2023	2.0
After 2023	6.9
Total commitments	$ 24.3
Number of aircrafts expected to be delivered in 2020 \| Aircraft	17

Commitments and Contingencies - Summary of the Expected Future Payments Through the End of the Terms of CPAs (Details) $ in Billions	Jun. 30, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Last six months of 2019	$ 1.1
2020	2.1
2021	2.1
2022	1.7
2023	1.1
After 2023	4.4
Total	$ 12.5

Debt - Narrative (Details)	1 Months Ended
Debt - Narrative (Details)	May 31, 2019 USD ($)	Feb. 28, 2019 trust	Jun. 30, 2019 USD ($)
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			$ 2,000,000,000.0
4.875% Senior Notes due 2025 \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 350,000,000
Interest rate	4.875%
Redemption price rate	101.00%

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

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

$ 996,000,000

$ 1,241,000,000

^[1]

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

996,000,000

$ 1,241,000,000

^[2]

$ 717,000,000

4.15%

$ 612,000,000

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

612,000,000

105,000,000

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

$ 296,000,000

4.55%

$ 253,000,000

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

253,000,000

43,000,000

United Airlines, Inc. | ETTC

1,013,000,000

865,000,000

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

865,000,000

$ 148,000,000

[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.

Debt - Contractual Principal Payments (Details) - UAL And United $ in Millions	Jun. 30, 2019 USD ($)
Debt Instrument [Line Items]
Last six months of 2019	$ 757
2020	1,350
2021	1,344
2022	1,697
2023	747
After 2023	8,484
Long-term debt	$ 14,379

Special Charges and Mark-to-Market ("MTM") Adjustments - Components of Special Charges (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

Operating:

Impairment of assets

$ 61

$ 111

$ 69

$ 134

Severance and benefit costs

(Gains) losses on sale of assets and other special charges

Total operating special charges

129

^[1]

169

^[1]

Nonoperating MTM (gains) losses on financial instruments

(34)

135

(51)

Total special charges and MTM (gains) losses on financial instruments

264

259

Income tax benefit

(8)

(59)

(8)

(58)

Total special charges and MTM (gains) losses on financial instruments, net of income tax

$ 29

$ 205

$ 30

$ 201

[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.

Special Charges and Mark-to-Market ("MTM") Adjustments - Narrative (Details) Employee in Thousands	1 Months Ended	3 Months Ended			6 Months Ended
	May 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2017 USD ($) Employee	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Early lease termination charge		$ 6,000,000
Other miscellaneous impairments		8,000,000
Fair value adjustment for aircraft purchased off lease and impairments related to certain fleet types and certain international slots no longer in use			$ 6,000,000		$ 8,000,000	$ 29,000,000
Severance and benefit costs		6,000,000	11,000,000		12,000,000	25,000,000
Gain for the change in fair value of certain derivative assets		4,000,000			1,000,000
Use Rights
Restructuring Cost and Reserve [Line Items]
Write off of intangible asset	$ 105,000,000
Azul
Restructuring Cost and Reserve [Line Items]
Gain (loss) for the change in fair value of equity investments		38,000,000	(135,000,000)		52,000,000	(90,000,000)
Management
Restructuring Cost and Reserve [Line Items]
Severance and benefit costs		6,000,000	5,000,000		10,000,000	11,000,000
International Brotherhood of Teamsters \| Voluntary Early-Out Program
Restructuring Cost and Reserve [Line Items]
Severance and benefit costs			$ 6,000,000		$ 2,000,000	$ 14,000,000
Number of technicians and related employees electing to voluntarily separate from the Company \| Employee				1
Severance payment per participant (up to)				$ 100,000
Aircraft Engines
Restructuring Cost and Reserve [Line Items]
Impairment of assets removed from operations		$ 47,000,000

Label	Element	Value
AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 7,000,000
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (7,000,000)

Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2019	Jul. 12, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Fiscal Period Focus	Q2
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Amendment Flag	false
Document Fiscal Year Focus	2019
Current Fiscal Year End Date	--12-31
Entity File Number	001-06033
Entity Registrant Name	United Airlines Holdings, Inc.
Entity Central Index Key	0000100517
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-2675207
Entity Information, Former Legal or Registered Name	United Continental Holdings, Inc.
Entity Address, Address Line One	233 South Wacker Drive,
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60606
City Area Code	(872)
Local Phone Number	825-4000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock,
Trading Symbol	UAL
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		256,921,469
United Airlines, Inc.
Entity Information [Line Items]
Entity File Number	001-10323
Entity Registrant Name	United Airlines, Inc.
Entity Central Index Key	0000319687
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	74-2099724
Entity Address, Address Line One	233 South Wacker Drive,
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60606
City Area Code	(872)
Local Phone Number	825-4000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		1,000

Statements of Consolidated Operations (Unaudited) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

$ 11,402

$ 10,777

^[1]

$ 20,991

$ 19,809

^[1]

3,057

2,878

^[1]

5,930

5,604

^[1]

2,385

2,390

^[1]

4,408

4,355

^[1]

715

693

^[1]

1,403

1,323

^[1]

660

625

^[1]

1,248

1,204

^[1]

560

538

^[1]

1,107

1,062

^[1]

421

438

^[1]

829

878

^[1]

442

393

^[1]

802

735

^[1]

119

^[1]

154

246

^[1]

129

^[1]

169

^[1]

1,546

1,429

^[1]

3,054

2,826

^[1]

9,930

9,632

^[1]

19,024

18,402

^[1]

1,472

1,145

^[1]

1,967

1,407

^[1]

(191)

(163)

^[1]

(379)

(325)

^[1]

^[1]

^[1]

(164)

^[1]

(117)

^[1]

(118)

(290)

^[1]

(246)

(370)

^[1]

1,354

855

^[1]

1,721

1,037

^[1]

302

172

^[1]

377

209

^[1]

$ 1,052

$ 683

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

$ 1,344

$ 828

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

$ 4.03

$ 2.48

^[1]

$ 5.09

$ 2.96

^[1]

$ 4.02

$ 2.48

^[1]

$ 5.07

$ 2.95

^[1]

$ 11,402

$ 10,777

^[4]

$ 20,991

$ 19,809

^[4]

3,057

2,878

^[4]

5,930

5,604

^[4]

2,385

2,390

^[4]

4,408

4,355

^[4]

715

693

^[4]

1,403

1,323

^[4]

660

625

^[4]

1,248

1,204

^[4]

560

538

^[4]

1,107

1,062

^[4]

421

438

^[4]

829

878

^[4]

442

393

^[4]

802

735

^[4]

119

^[4]

154

246

^[4]

129

^[4]

169

^[4]

1,546

1,428

^[4]

3,053

2,825

^[4]

9,930

9,631

^[4]

19,023

18,401

^[4]

1,472

1,146

^[4]

1,968

1,408

^[4]

(191)

(163)

^[4]

(379)

(325)

^[4]

^[4]

^[4]

(164)

^[4]

(117)

^[4]

(118)

(290)

^[4]

(246)

(370)

^[4]

1,354

856

^[4]

1,722

1,038

^[4]

302

173

^[4]

377

210

^[4]

1,052

683

^[4],[5]

1,345

828

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

Passenger revenue

Passenger revenue | United Airlines, Inc.

10,486

9,880

^[1]

19,211

18,030

^[1]

10,486

9,880

^[4]

19,211

18,030

^[4]

Cargo

Cargo | United Airlines, Inc.

295

314

^[1]

581

607

^[1]

295

314

^[4]

581

607

^[4]

Other operating revenue

Other operating revenue | United Airlines, Inc.

621

583

^[1]

1,199

1,172

^[1]

$ 621

$ 583

^[4]

$ 1,199

$ 1,172

^[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

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

$ 1,052

$ 683

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

$ 1,344

$ 828

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

(17)

^[3]

(10)

^[3]

Total other comprehensive income (loss), net of tax

^[3]

(4)

^[3]

(14)

^[3]

(4)

^[3]

1,038

695

^[3]

1,340

866

^[3]

1,052

683

^[4],[5]

1,345

828

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

(17)

^[4]

(10)

^[4]

Total other comprehensive income (loss), net of tax

^[4]

(4)

^[4]

(14)

^[4]

(4)

^[4]

$ 1,038

$ 695

^[4]

$ 1,341

$ 866

^[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.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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

Jun. 30, 2019

Dec. 31, 2018

$ 3,221

$ 1,694

^[1]

Receivables, less allowance for doubtful accounts (2019 — $9; 2018 — $8)

2,223

2,256

^[1]

1,762

1,426

^[1]

Aircraft fuel, spare parts and supplies, less obsolescence allowance (2019 — $387; 2018 — $412)

996

985

^[1]

708

733

^[1]

8,910

7,094

^[1]

33,890

32,599

^[1]

7,371

6,889

^[1]

1,351

1,177

^[1]

42,612

40,665

^[1]

(13,694)

(13,266)

^[1]

28,918

27,399

^[1]

4,908

5,262

^[1]

Intangibles, less accumulated amortization (2019 — $1,410; 2018 — $1,380)

4,523

^[1]

3,129

3,159

^[1]

105

^[1]

518

516

^[1]

1,139

966

^[1]

9,414

9,269

^[1]

52,150

49,024

^[1]

3,033

2,363

^[1]

1,871

2,184

^[1]

1,255

1,230

^[1]

117

123

^[1]

637

719

^[1]

604

553

^[1]

16,078

13,839

^[1]

12,938

12,215

^[1]

202

224

^[1]

5,034

5,276

^[1]

1,277

1,295

^[1]

1,366

1,576

^[1]

1,192

828

^[1]

980

1,010

^[1]

7,578

7,428

^[1]

^[1]

Common stock at par, $0.01 par value; authorized 1,000,000,000 shares; outstanding 257,729,166 and 269,914,769 shares at June 30, 2019 and December 31, 2018, respectively

Preferred stock

^[1]

^[1]

6,096

6,120

^[1]

Stock held in treasury, at cost

8,050

6,715

^[1]

(3,022)

(1,993)

^[1]

(807)

(803)

^[1]

10,320

10,042

^[1],[2]

52,150

49,024

^[1]

3,215

1,688

^[3]

Receivables, less allowance for doubtful accounts (2019 — $9; 2018 — $8)

2,223

2,256

^[3]

1,762

1,426

^[3]

Aircraft fuel, spare parts and supplies, less obsolescence allowance (2019 — $387; 2018 — $412)

996

985

^[3]

708

733

^[3]

8,904

7,088

^[3]

33,890

32,599

^[3]

7,371

6,889

^[3]

1,351

1,177

^[3]

42,612

40,665

^[3]

(13,694)

(13,266)

^[3]

28,918

27,399

^[3]

4,908

5,262

^[3]

Intangibles, less accumulated amortization (2019 — $1,410; 2018 — $1,380)

4,523

^[3]

3,129

3,159

^[3]

105

^[3]

518

516

^[3]

1,139

966

^[3]

9,414

9,269

^[3]

52,144

49,018

^[3]

3,033

2,363

^[3]

1,871

2,184

^[3]

1,255

1,230

^[3]

117

123

^[3]

637

719

^[3]

608

558

^[3]

16,082

13,844

^[3]

12,938

12,215

^[3]

202

224

^[3]

5,034

5,276

^[3]

1,277

1,295

^[3]

1,366

1,576

^[3]

1,220

855

^[3]

980

1,010

^[3]

7,606

7,455

^[3]

^[3]

Common stock at par, $0.01 par value; authorized 1,000,000,000 shares; outstanding 257,729,166 and 269,914,769 shares at June 30, 2019 and December 31, 2018, respectively

^[3]

598

^[3]

11,230

10,319

^[3]

Receivable from related parties

(807)

(803)

^[3]

(141)

(110)

^[3]

10,282

10,004

^[3],[4]

52,144

49,018

^[3]

Advance ticket sales

Advance ticket sales | United Airlines, Inc.

6,126

4,381

^[1]

6,126

4,381

^[3]

2,435

2,286

^[1]

Frequent flyer deferred revenue | United Airlines, Inc.

2,763

2,719

^[1]

2,435

2,286

^[3]

$ 2,763

$ 2,719

^[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	Jun. 30, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 9	$ 8
Obsolescence allowance for aircraft fuel, spare parts and supplies	387	412
Accumulated amortization on intangibles	$ 1,410	$ 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)	257,729,166	269,914,769
United Airlines, Inc.
Allowance for doubtful accounts	$ 9	$ 8
Obsolescence allowance for aircraft fuel, spare parts and supplies	387	412
Accumulated amortization on intangibles	$ 1,410	$ 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

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

$ 4,625

$ 4,152

^[1]

(2,467)

(1,671)

^[1]

Proceeds from sale of short-term and other investments

(1,443)

(1,326)

^[1]

1,484

1,455

^[1]

(27)

(139)

^[1]

(10)

^[1]

^[1]

(2,436)

(1,653)

^[1]

996

1,241

^[1]

(473)

(1,294)

^[1]

(1,062)

(969)

^[1]

(63)

(35)

^[1]

(30)

(25)

^[1]

(30)

(17)

^[1]

Net increase in cash, cash equivalents and restricted cash

(662)

(1,099)

^[1]

1,527

1,400

^[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]

3,326

2,991

^[1]

Investing and Financing Activities Not Affecting Cash:

Property and equipment acquired through the issuance of debt

220

125

^[1]

Right-of-use assets acquired through operating leases

^[1]

103

^[1]

Property and equipment acquired through finance leases

^[1]

4,596

4,135

^[3]

(2,467)

(1,671)

^[3]

Proceeds from sale of short-term and other investments

(1,443)

(1,326)

^[3]

1,484

1,455

^[3]

(27)

(139)

^[3]

(10)

^[3]

^[3]

(2,436)

(1,653)

^[3]

996

1,241

^[3]

(473)

(1,294)

^[3]

(1,062)

(969)

^[3]

(63)

(35)

^[3]

(30)

(25)

^[3]

(1)

^[3]

Net increase in cash, cash equivalents and restricted cash

(633)

(1,082)

^[3]

1,527

1,400

^[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]

3,320

2,985

^[3]

Investing and Financing Activities Not Affecting Cash:

Property and equipment acquired through the issuance of debt

220

125

^[3]

Right-of-use assets acquired through operating leases

^[3]

103

^[3]

Property and equipment acquired through finance leases

$ 8

$ 0

^[3]

[1]

[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	$	3,221	$	2,884
Restricted cash (included in Prepaid expenses and other)	—		13
Restricted cash	105		94
Total cash, cash equivalents and restricted cash	$	3,326	$	2,991

[3]

[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	$	3,215	$	2,878
Restricted cash (included in Prepaid expenses and other)	—		13
Restricted cash	105		94
Total cash, cash equivalents and restricted cash	$	3,320	$	2,985

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

Jun. 30, 2019

Dec. 31, 2018

Jun. 30, 2018

Reconciliation of cash, cash equivalents and restricted cash:

Restricted cash (included in Prepaid expenses and other)

$ 3,221

$ 1,694

^[1]

$ 2,884

105

^[1]

3,326

^[2]

1,799

2,991

^[2],[3]

Reconciliation of cash, cash equivalents and restricted cash:

Restricted cash (included in Prepaid expenses and other)

3,215

1,688

^[4]

2,878

105

^[4]

Balance (in shares) at Dec. 31, 2017

$ 3,320

^[5]

$ 1,793

$ 2,985

^[5],[6]

[1]

[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	$	3,221	$	2,884
Restricted cash (included in Prepaid expenses and other)	—		13
Restricted cash	105		94
Total cash, cash equivalents and restricted cash	$	3,326	$	2,991

[3]

[4]

[5]

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	$	3,215	$	2,878
Restricted cash (included in Prepaid expenses and other)	—		13
Restricted cash	105		94
Total cash, cash equivalents and restricted cash	$	3,320	$	2,985

[6]

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

Total

Common Stock

Additional Capital Invested

Treasury Stock

Retained Earnings

Accumulated Other Comprehensive Income (Loss)

United Airlines, Inc.

Additional Capital Invested

United Airlines, Inc.

Retained Earnings

United Airlines, Inc.

Accumulated Other Comprehensive Income (Loss)

United Airlines, Inc.

Receivable from Related Parties, Net

^[1]

287,000,000.0

Balance at Dec. 31, 2017

$ 8,788

^[1]

$ 3

^[1]

$ 6,098

^[1]

$ (769)

^[1]

$ 4,603

^[1]

$ (1,147)

^[1]

$ 8,751

^[2]

$ 1,787

^[2]

$ 8,201

^[2]

$ (1,147)

^[2]

$ (90)

^[2]

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

828

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

828

^[1]

828

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

828

^[3]

^[5]

(976)

(14,200,000)

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

(976)

200,000

(16)

(36)

(5)

(17)

(7)

(18)

^[1]

273,000,000.0

Balance (in shares) at Mar. 31, 2018

8,691

^[1]

$ 3

^[1]

6,091

^[1]

(1,720)

^[1]

5,419

^[1]

(1,102)

^[1]

8,653

^[2]

841

^[2]

9,022

^[2]

(1,102)

^[2]

(108)

^[2]

^[1]

279,400,000

Balance at Mar. 31, 2018

8,388

^[1]

$ 3

^[1]

6,077

^[1]

(1,314)

^[1]

4,736

^[1]

(1,114)

^[1]

8,350

^[2]

1,233

^[2]

8,339

^[2]

(1,114)

^[2]

(108)

^[2]

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

683

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

683

^[1]

683

^[5],[6]

683

^[3]

^[5]

(407)

(6,400,000)

(407)

^[1]

273,000,000.0

Balance (in shares) at Dec. 31, 2018

$ 8,691

^[1]

$ 3

^[1]

6,091

^[1]

(1,720)

^[1]

5,419

^[1]

(1,102)

^[1]

$ 8,653

^[2]

841

^[2]

9,022

^[2]

(1,102)

^[2]

(108)

^[2]

269,914,769

269,900,000

^[1]

1,000

Balance at Dec. 31, 2018

$ 10,042

^[1],[7]

$ 3

^[1]

6,120

^[1]

(1,993)

^[1]

6,715

^[1]

(803)

^[1]

$ 10,004

^[2],[8]

598

^[2]

10,319

^[2]

(803)

^[2]

(110)

^[2]

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

1,344

1,345

(4)

(1,063)

(629)

(434)

(12,700,000)

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

(1,063)

500,000

$ (30)

(55)

(9)

$ (31)

(31)

257,729,166

257,700,000

1,000

Balance (in shares) at Mar. 31, 2019

$ 10,320

$ 3

6,096

(3,022)

8,050

(807)

$ 10,282

11,230

(807)

(141)

264,300,000

Balance at Mar. 31, 2019

9,802

$ 3

6,080

(2,487)

6,999

(793)

9,763

^[2]

10,612

^[2]

(793)

^[2]

(140)

^[2]

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

1,052

(14)

(536)

(102)

(434)

(6,600,000)

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

(536)

$ (1)

(1)

$ 0

(1)

257,729,166

257,700,000

1,000

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

$ 10,320

$ 3

$ 6,096

$ (3,022)

$ 8,050

$ (807)

$ 10,282

$ 0

$ 11,230

$ (807)

$ (141)

[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

6 Months Ended

Jun. 30, 2019

RECENTLY ISSUED ACCOUNTING STANDARDS



	Three Months Ended June 30, 2018									Six Months Ended June 30, 2018
	As Reported			New Lease Standard Adjustments			As Adjusted			As Reported			New Lease Standard Adjustments			As Adjusted
Regional capacity purchase	$	681		$	12		$	693		$	1,300		$	23		$	1,323
Landing fees and other rent	603			22			625			1,161			43			1,204
Depreciation and amortization	557			(19		)	538			1,098			(36		)	1,062
Interest expense	(177		)	14			(163		)	(353		)	28			(325		)
Interest capitalized	14			(2		)	12			33			(3		)	30
Net income	684			(1		)	683			831			(3		)	828
Earnings per share, basic	2.49			(0.01		)	2.48			2.97			(0.01		)	2.96
Earnings per share, diluted	2.48			—			2.48			2.96			(0.01		)	2.95

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



	December 31, 2018
	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
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 (in millions):



	Six Months Ended June 30, 2018
	As Reported			New Lease Standard Adjustments			As Adjusted
Cash Flows from Operating Activities:
Net cash provided by operating activities	$	4,175		$	(23	)	$	4,152

Cash Flows from Investing Activities:
Capital expenditures	(1,734		)	63			(1,671		)

Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt	1,308			(67		)	1,241
Principal payments under finance leases	(62		)	27			(35		)

Revenue

6 Months Ended

Jun. 30, 2019

REVENUE

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Domestic (U.S. and Canada)	$	7,087	$	6,689	$	12,962	$	12,165
Atlantic	2,066		1,965		3,524		3,354
Pacific	1,306		1,285		2,587		2,516
Latin America	943		838		1,918		1,774
Total	$	11,402	$	10,777	$	20,991	$	19,809

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



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Total Frequent flyer deferred revenue - beginning balance	$	5,138		$	4,937		$	5,005		$	4,783
Miles awarded	682			607			1,289			1,210
Travel miles redeemed (Passenger revenue)	(589		)	(519		)	(1,027		)	(928		)
Non-travel miles redeemed (Other operating revenue)	(33		)	(36		)	(69		)	(76		)
Total Frequent flyer deferred revenue - ending balance	$	5,198		$	4,989		$	5,198		$	4,989

Earnings Per Share

6 Months Ended

Jun. 30, 2019

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 June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Earnings available to common stockholders	$	1,052	$	683	$	1,344	$	828

Basic weighted-average shares outstanding	260.8		274.7		263.9		279.3
Effect of employee stock awards	0.8		0.9		1.0		0.9
Diluted weighted-average shares outstanding	261.6		275.6		264.9		280.2

Earnings per share, basic	$	4.03	$	2.48	$	5.09	$	2.96
Earnings per share, diluted	$	4.02	$	2.48	$	5.07	$	2.95

Accumulated Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2019

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 March 31, 2019	$	(654	)		$	1		$	(140	)	$	(793	)
Changes in value	(29		)		2			7			(20		)
Amounts reclassified to earnings	8				—			(2		)	6
Balance at June 30, 2019	$	(675	)		$	3		$	(135	)	$	(807	)
Balance at December 31, 2018	$	(663	)		$	(4	)	$	(136	)	$	(803	)
Changes in value	(24		)		7			4			(13		)
Amounts reclassified to earnings	12			(a)	—			(3		)	9
Balance at June 30, 2019	$	(675	)		$	3		$	(135	)	$	(807	)

Balance at March 31, 2018	$	(1,063	)		$	(3	)	$	(48	)	$	(1,114	)
Changes in value	1				1			—			2
Amounts reclassified to earnings	14				—			(4		)	10
Balance at June 30, 2018	$	(1,048	)		$	(2	)	$	(52	)	$	(1,102	)
Balance at December 31, 2017	$	(1,102	)		$	(6	)	$	(39	)	$	(1,147	)
Changes in value	24				(3		)	(6		)	15
Amounts reclassified to earnings	30			(a)	—			(7		)	23
Amounts reclassified to retained earnings	—				7			—			7
Balance at June 30, 2018	$	(1,048	)		$	(2	)	$	(52	)	$	(1,102	)

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2019
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXESThe Company's effective tax rate for the three and six months ended June 30, 2019 was 22.3% and 21.9%, respectively. The effective tax rate for the three and six months ended June 30, 2018 was 20.1% and 20.2%, 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

6 Months Ended

Jun. 30, 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 June 30 (in millions):



	Pension Benefits						Other Postretirement Benefits						Affected Line Item in the Statements of Consolidated Operations
	2019			2018			2019			2018
Service cost	$	46		$	57		$	3		$	3		Salaries and related costs
Interest cost	57			54			14			15			Miscellaneous, net
Expected return on plan assets	(73		)	(73		)	(1		)	—			Miscellaneous, net
Amortization of unrecognized (gain) loss	29			32			(15		)	(8		)	Miscellaneous, net
Amortization of prior service credit	—			—			(9		)	(10		)	Miscellaneous, net
Settlement loss	3			—			—			—			Miscellaneous, net
Total	$	62		$	70		$	(8	)	$	—

The Company's net periodic benefit cost includes the following components for the six months ended June 30 (in millions):



	Pension Benefits						Other Postretirement Benefits						Affected Line Item in the Statements of Consolidated Operations
	2019			2018			2019			2018
Service cost	$	92		$	114		$	5		$	6		Salaries and related costs
Interest cost	114			108			29			30			Miscellaneous, net
Expected return on plan assets	(145		)	(146		)	(1		)	—			Miscellaneous, net
Amortization of unrecognized (gain) loss	58			65			(30		)	(16		)	Miscellaneous, net
Amortization of prior service credit	—			—			(19		)	(19		)	Miscellaneous, net
Settlement loss	3			—			—			—			Miscellaneous, net
Total	$	122		$	141		$	(16	)	$	1

During the three and six months ended June 30, 2019, the Company contributed $150 million and $300 million, respectively, to its U.S. domestic tax-qualified defined benefit pension plans.

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Share-based compensation expense	$	21	$	27	$	37	$	44

	June 30, 2019		December 31, 2018
Unrecognized share-based compensation	$	110	$	68

BRW Term Loan	6 Months Ended
BRW Term Loan	Jun. 30, 2019
Receivables [Abstract]
BRW TERM LOAN	BRW TERM LOAN In November 2018, United, as lender, entered into a Term Loan Agreement (the "BRW Loan Agreement") with, among others, BRW Aviation Holding LLC and BRW Aviation LLC (“BRW”), as guarantor and borrower, respectively, affiliates of Synergy Aerospace Corporation (“Synergy”), the majority shareholder of Avianca Holdings S.A. (“AVH”), as guarantor and borrower, respectively. Pursuant to the BRW Loan Agreement, United provided a $456 million term loan to BRW (the "BRW Term Loan"), secured by a pledge of BRW's equity, as well as BRW's 516 million shares of common stock of AVH (having an implied value equivalent to 64.5 million American Depositary Receipts ("ADRs"), the class of AVH securities that trades on the New York Stock Exchange (the "NYSE")), the parent company of Aerovías del Continente Americano S.A. BRW is currently in default under the BRW Loan Agreement. On May 13, 2019, S&P Global Ratings downgraded its AVH issuer level credit ratings from B to CCC+, together with accompanying downgrades for AVH’s frequent flyer subsidiary LifeMiles Ltd. ("LifeMiles") and for certain outstanding debt of both AVH and LifeMiles. Following these downgrades, and in order to protect the value of its collateral, on May 24, 2019, United began to exercise remedies available to it under the terms of the BRW Loan Agreement and related documents. In connection with the delivery by United of a notice of default to BRW, Kingsland Holdings Limited ("Kingsland"), AVH’s largest minority shareholder, was granted, in accordance with the agreements related to the BRW Loan Agreement, independent authority to manage BRW, which remains the majority shareholder of AVH. As a result of these developments, United evaluated the $489 million carrying value of the BRW Term Loan as of June 30, 2019 using the fair value of the collateral and determined that the value of the collateral is sufficient to recover the carrying value of the loan and, accordingly, concluded that the BRW Term Loan is not impaired. The fair market value of AVH equity was estimated using an income approach and a market approach with equal weight applied to each approach. Under the income approach, the value was estimated by discounting expected future cash flows at a weighted average cost of capital to a single present value amount. Under the market approach, the value was estimated by reference to multiples of enterprise value to earnings before interest, taxes, depreciation, amortization and rent ("EBITDAR") for a group of publicly-traded market comparable companies, along with AVH's own EBITDAR levels.

Financial Instruments and Fair Value Measurements

6 Months Ended

Jun. 30, 2019

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):



	June 30, 2019								December 31, 2018
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Cash and cash equivalents	$	3,221	$	3,221	$	—	$	—	$	1,694	$	1,694	$	—	$	—
Short-term investments:
Corporate debt	1,053		—		1,053		—		1,023		—		1,023		—
Asset-backed securities	697		—		697		—		746		—		746		—
U.S. government and agency notes	116		—		116		—		108		—		108		—
Certificates of deposit placed through an account registry service ("CDARS")	59		—		59		—		75		—		75		—
Other fixed-income securities	107		—		107		—		116		—		116		—
Other investments measured at net asset value ("NAV")	191		—		—		—		188		—		—		—
Restricted cash	105		105		—		—		105		105		—		—
Long-term investments:
Equity securities	301		301		—		—		249		249		—		—
Enhanced equipment trust certificates ("EETC")	16		—		—		16		18		—		—		18
AVH Derivative Assets (defined below)	10		—		—		10		11		—		—		11

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



	June 30, 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	$	14,193	$	14,691	$	—	$	10,915	$	3,776	$	13,445	$	13,450	$	—	$	9,525	$	3,925

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.
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.

Leases

6 Months Ended

Jun. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

LEASES

Lease Cost. The Company's lease cost for the three and six months ended June 30 included the following components (in millions):



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Operating lease cost	$	259		$	312		$	531		$	638
Variable and short-term lease cost	661			669			1,267			1,280
Amortization of finance lease assets	18			17			36			40
Interest on finance lease liabilities	32			4			59			9
Sublease income	(9		)	(11		)	(17		)	(21		)
Total lease cost	$	961		$	991		$	1,876		$	1,946

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 June 30, 2019 (in millions):



	Operating Leases			Finance Leases
Last six months of 2019	$	428		$	157
2020	989			58
2021	766			54
2022	634			44
2023	621			33
After 2023	4,331			70
Minimum lease payments	7,769			416
Imputed interest	2,098			97
Present value of minimum lease payments	5,671			319
Less: current maturities of lease obligations	(637		)	(117		)
Long-term lease obligations	$	5,034		$	202

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.



	2019			2018
Weighted-average remaining lease term - operating leases	10 years			10 years
Weighted-average remaining lease term - finance leases	5 years			5 years
Weighted-average discount rate - operating leases	5.3	%		5.1	%
Weighted-average discount rate - finance leases	53.2	%	(a)	6.7	%

The table below presents supplemental cash flow information related to leases during the six months ended June 30 (in millions):



	2019		2018
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	507	$	552
Operating cash flows for finance leases	47		9
Financing cash flows for finance leases	63		35

Commitments and Contingencies

6 Months Ended

Jun. 30, 2019

COMMITMENTS AND CONTINGENCIES



		Scheduled Aircraft Deliveries
Aircraft Type	Number of Firm Commitments (a)	Last Six Months of 2019	2020	After 2020
Airbus A350	45	—	—	45
Boeing 737 MAX	171	16	28	127
Boeing 777-300ER	4	2	2	—
Boeing 787	18	2	15	1
Embraer E175	38	18	20	—
(a) United also has options and purchase rights for additional aircraft.

During the second quarter of 2019, the Company placed an order for 20 additional Embraer E175 aircraft which will be operated by a regional carrier.

The table below summarizes United's commitments as of June 30, 2019, which include aircraft and related spare engines, aircraft improvements and all non-aircraft capital commitments:



	(in billions)
Last six months of 2019	$	2.2
2020 (a)	5.9
2021	4.0
2022	3.3
2023	2.0
After 2023	6.9
	$	24.3



	(in billions)
Last six months of 2019	$	1.1
2020	2.1
2021	2.1
2022	1.7
2023	1.1
After 2023	4.4
	$	12.5

Debt

6 Months Ended

Jun. 30, 2019

DEBT



EETC Issuance Date	Class	Face Amount		Final expected distribution date	Stated interest rate	Total proceeds received from issuance of debt during 2019 and recorded as debt as of June 30, 2019		Remaining proceeds from issuance of certificates to be received in future periods
February 2019	AA	$	717	August 2031	4.15%	$	612	$	105
February 2019	A	296		August 2031	4.55%	253		43
		$	1,013			$	865	$	148



Last six months of 2019	$	757
2020	1,350
2021	1,344
2022	1,697
2023	747
After 2023	8,484
	$	14,379

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

6 Months Ended

Jun. 30, 2019

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

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

For the three and six months ended June 30, special charges and MTM adjustments consisted of the following (in millions):



	Three Months Ended June 30,						Six Months Ended June 30,
Operating:	2019			2018			2019			2018
Impairment of assets	$	61		$	111		$	69		$	134
Severance and benefit costs	6			11			12			25
(Gains) losses on sale of assets and other special charges	4			7			8			10
Total operating special charges	71			129			89			169
Nonoperating MTM (gains) losses on financial instruments	(34		)	135			(51		)	90
Total special charges and MTM (gains) losses on financial instruments	37			264			38			259
Income tax benefit	(8		)	(59		)	(8		)	(58		)
Total special charges and MTM (gains) losses on financial instruments, net of income tax	$	29		$	205		$	30		$	201

2019

2018

During the three and six months ended June 30, 2018, the Company recorded losses of $135 million and $90 million, respectively, for the change in market value of its investment in Azul.

Recently Issued Accounting Standards (Policies)

6 Months Ended

Jun. 30, 2019

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recently Issued Accounting Standards



	Three Months Ended June 30, 2018									Six Months Ended June 30, 2018
	As Reported			New Lease Standard Adjustments			As Adjusted			As Reported			New Lease Standard Adjustments			As Adjusted
Regional capacity purchase	$	681		$	12		$	693		$	1,300		$	23		$	1,323
Landing fees and other rent	603			22			625			1,161			43			1,204
Depreciation and amortization	557			(19		)	538			1,098			(36		)	1,062
Interest expense	(177		)	14			(163		)	(353		)	28			(325		)
Interest capitalized	14			(2		)	12			33			(3		)	30
Net income	684			(1		)	683			831			(3		)	828
Earnings per share, basic	2.49			(0.01		)	2.48			2.97			(0.01		)	2.96
Earnings per share, diluted	2.48			—			2.48			2.96			(0.01		)	2.95

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



	December 31, 2018
	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
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 (in millions):



	Six Months Ended June 30, 2018
	As Reported			New Lease Standard Adjustments			As Adjusted
Cash Flows from Operating Activities:
Net cash provided by operating activities	$	4,175		$	(23	)	$	4,152

Cash Flows from Investing Activities:
Capital expenditures	(1,734		)	63			(1,671		)

Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt	1,308			(67		)	1,241
Principal payments under finance leases	(62		)	27			(35		)

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.
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)

6 Months Ended

Jun. 30, 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 (in millions):



	December 31, 2018
	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
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 (in millions):



	Six Months Ended June 30, 2018
	As Reported			New Lease Standard Adjustments			As Adjusted
Cash Flows from Operating Activities:
Net cash provided by operating activities	$	4,175		$	(23	)	$	4,152

Cash Flows from Investing Activities:
Capital expenditures	(1,734		)	63			(1,671		)

Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt	1,308			(67		)	1,241
Principal payments under finance leases	(62		)	27			(35		)

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 (in millions, except per share amounts):



	Three Months Ended June 30, 2018									Six Months Ended June 30, 2018
	As Reported			New Lease Standard Adjustments			As Adjusted			As Reported			New Lease Standard Adjustments			As Adjusted
Regional capacity purchase	$	681		$	12		$	693		$	1,300		$	23		$	1,323
Landing fees and other rent	603			22			625			1,161			43			1,204
Depreciation and amortization	557			(19		)	538			1,098			(36		)	1,062
Interest expense	(177		)	14			(163		)	(353		)	28			(325		)
Interest capitalized	14			(2		)	12			33			(3		)	30
Net income	684			(1		)	683			831			(3		)	828
Earnings per share, basic	2.49			(0.01		)	2.48			2.97			(0.01		)	2.96
Earnings per share, diluted	2.48			—			2.48			2.96			(0.01		)	2.95

Revenue (Tables)

6 Months Ended

Jun. 30, 2019

Operating Revenue by Geographic Region

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Domestic (U.S. and Canada)	$	7,087	$	6,689	$	12,962	$	12,165
Atlantic	2,066		1,965		3,524		3,354
Pacific	1,306		1,285		2,587		2,516
Latin America	943		838		1,918		1,774
Total	$	11,402	$	10,777	$	20,991	$	19,809

Roll Forward of Frequent Flyer Deferred Revenue

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



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Total Frequent flyer deferred revenue - beginning balance	$	5,138		$	4,937		$	5,005		$	4,783
Miles awarded	682			607			1,289			1,210
Travel miles redeemed (Passenger revenue)	(589		)	(519		)	(1,027		)	(928		)
Non-travel miles redeemed (Other operating revenue)	(33		)	(36		)	(69		)	(76		)
Total Frequent flyer deferred revenue - ending balance	$	5,198		$	4,989		$	5,198		$	4,989

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2019

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 June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Earnings available to common stockholders	$	1,052	$	683	$	1,344	$	828

Basic weighted-average shares outstanding	260.8		274.7		263.9		279.3
Effect of employee stock awards	0.8		0.9		1.0		0.9
Diluted weighted-average shares outstanding	261.6		275.6		264.9		280.2

Earnings per share, basic	$	4.03	$	2.48	$	5.09	$	2.96
Earnings per share, diluted	$	4.02	$	2.48	$	5.07	$	2.95

Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2019

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 March 31, 2019	$	(654	)		$	1		$	(140	)	$	(793	)
Changes in value	(29		)		2			7			(20		)
Amounts reclassified to earnings	8				—			(2		)	6
Balance at June 30, 2019	$	(675	)		$	3		$	(135	)	$	(807	)
Balance at December 31, 2018	$	(663	)		$	(4	)	$	(136	)	$	(803	)
Changes in value	(24		)		7			4			(13		)
Amounts reclassified to earnings	12			(a)	—			(3		)	9
Balance at June 30, 2019	$	(675	)		$	3		$	(135	)	$	(807	)

Balance at March 31, 2018	$	(1,063	)		$	(3	)	$	(48	)	$	(1,114	)
Changes in value	1				1			—			2
Amounts reclassified to earnings	14				—			(4		)	10
Balance at June 30, 2018	$	(1,048	)		$	(2	)	$	(52	)	$	(1,102	)
Balance at December 31, 2017	$	(1,102	)		$	(6	)	$	(39	)	$	(1,147	)
Changes in value	24				(3		)	(6		)	15
Amounts reclassified to earnings	30			(a)	—			(7		)	23
Amounts reclassified to retained earnings	—				7			—			7
Balance at June 30, 2018	$	(1,048	)		$	(2	)	$	(52	)	$	(1,102	)

Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2019

Components of Net Periodic Benefit Cost

The Company's net periodic benefit cost includes the following components for the three months ended June 30 (in millions):



	Pension Benefits						Other Postretirement Benefits						Affected Line Item in the Statements of Consolidated Operations
	2019			2018			2019			2018
Service cost	$	46		$	57		$	3		$	3		Salaries and related costs
Interest cost	57			54			14			15			Miscellaneous, net
Expected return on plan assets	(73		)	(73		)	(1		)	—			Miscellaneous, net
Amortization of unrecognized (gain) loss	29			32			(15		)	(8		)	Miscellaneous, net
Amortization of prior service credit	—			—			(9		)	(10		)	Miscellaneous, net
Settlement loss	3			—			—			—			Miscellaneous, net
Total	$	62		$	70		$	(8	)	$	—

The Company's net periodic benefit cost includes the following components for the six months ended June 30 (in millions):



	Pension Benefits						Other Postretirement Benefits						Affected Line Item in the Statements of Consolidated Operations
	2019			2018			2019			2018
Service cost	$	92		$	114		$	5		$	6		Salaries and related costs
Interest cost	114			108			29			30			Miscellaneous, net
Expected return on plan assets	(145		)	(146		)	(1		)	—			Miscellaneous, net
Amortization of unrecognized (gain) loss	58			65			(30		)	(16		)	Miscellaneous, net
Amortization of prior service credit	—			—			(19		)	(19		)	Miscellaneous, net
Settlement loss	3			—			—			—			Miscellaneous, net
Total	$	122		$	141		$	(16	)	$	1

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Share-based compensation expense	$	21	$	27	$	37	$	44

	June 30, 2019		December 31, 2018
Unrecognized share-based compensation	$	110	$	68

Financial Instruments and Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

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):



	June 30, 2019								December 31, 2018
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Cash and cash equivalents	$	3,221	$	3,221	$	—	$	—	$	1,694	$	1,694	$	—	$	—
Short-term investments:
Corporate debt	1,053		—		1,053		—		1,023		—		1,023		—
Asset-backed securities	697		—		697		—		746		—		746		—
U.S. government and agency notes	116		—		116		—		108		—		108		—
Certificates of deposit placed through an account registry service ("CDARS")	59		—		59		—		75		—		75		—
Other fixed-income securities	107		—		107		—		116		—		116		—
Other investments measured at net asset value ("NAV")	191		—		—		—		188		—		—		—
Restricted cash	105		105		—		—		105		105		—		—
Long-term investments:
Equity securities	301		301		—		—		249		249		—		—
Enhanced equipment trust certificates ("EETC")	16		—		—		16		18		—		—		18
AVH Derivative Assets (defined below)	10		—		—		10		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):



	June 30, 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	$	14,193	$	14,691	$	—	$	10,915	$	3,776	$	13,445	$	13,450	$	—	$	9,525	$	3,925

Leases (Tables)

6 Months Ended

Jun. 30, 2019

Summary of Scheduled Future Minimum Lease Payments under Operating Leases

Components of Lease Cost

The Company's lease cost for the three and six months ended June 30 included the following components (in millions):



	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Operating lease cost	$	259		$	312		$	531		$	638
Variable and short-term lease cost	661			669			1,267			1,280
Amortization of finance lease assets	18			17			36			40
Interest on finance lease liabilities	32			4			59			9
Sublease income	(9		)	(11		)	(17		)	(21		)
Total lease cost	$	961		$	991		$	1,876		$	1,946

The table below summarizes the Company's scheduled future minimum lease payments under operating and finance leases, recorded on the balance sheet, as of June 30, 2019 (in millions):



	Operating Leases			Finance Leases
Last six months of 2019	$	428		$	157
2020	989			58
2021	766			54
2022	634			44
2023	621			33
After 2023	4,331			70
Minimum lease payments	7,769			416
Imputed interest	2,098			97
Present value of minimum lease payments	5,671			319
Less: current maturities of lease obligations	(637		)	(117		)
Long-term lease obligations	$	5,034		$	202

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 June 30, 2019 (in millions):



	Operating Leases			Finance Leases
Last six months of 2019	$	428		$	157
2020	989			58
2021	766			54
2022	634			44
2023	621			33
After 2023	4,331			70
Minimum lease payments	7,769			416
Imputed interest	2,098			97
Present value of minimum lease payments	5,671			319
Less: current maturities of lease obligations	(637		)	(117		)
Long-term lease obligations	$	5,034		$	202

Additional Information Related to Leases

The table below presents additional information related to our leases as of June 30:



	2019			2018
Weighted-average remaining lease term - operating leases	10 years			10 years
Weighted-average remaining lease term - finance leases	5 years			5 years
Weighted-average discount rate - operating leases	5.3	%		5.1	%
Weighted-average discount rate - finance leases	53.2	%	(a)	6.7	%

Supplemental Cash Flow Information Related to Leases

The table below presents supplemental cash flow information related to leases during the six months ended June 30 (in millions):



	2019		2018
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	507	$	552
Operating cash flows for finance leases	47		9
Financing cash flows for finance leases	63		35

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

Firm Commitments and Options to Purchase Aircraft and Summary of Commitments



		Scheduled Aircraft Deliveries
Aircraft Type	Number of Firm Commitments (a)	Last Six Months of 2019	2020	After 2020
Airbus A350	45	—	—	45
Boeing 737 MAX	171	16	28	127
Boeing 777-300ER	4	2	2	—
Boeing 787	18	2	15	1
Embraer E175	38	18	20	—
(a) United also has options and purchase rights for additional aircraft.

The table below summarizes United's commitments as of June 30, 2019, which include aircraft and related spare engines, aircraft improvements and all non-aircraft capital commitments:



	(in billions)
Last six months of 2019	$	2.2
2020 (a)	5.9
2021	4.0
2022	3.3
2023	2.0
After 2023	6.9
	$	24.3

Summary of the Expected Future Payments Through the End of the Terms of CPAs



	(in billions)
Last six months of 2019	$	1.1
2020	2.1
2021	2.1
2022	1.7
2023	1.1
After 2023	4.4
	$	12.5

Debt (Tables)

6 Months Ended

Jun. 30, 2019

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 Issuance Date	Class	Face Amount		Final expected distribution date	Stated interest rate	Total proceeds received from issuance of debt during 2019 and recorded as debt as of June 30, 2019		Remaining proceeds from issuance of certificates to be received in future periods
February 2019	AA	$	717	August 2031	4.15%	$	612	$	105
February 2019	A	296		August 2031	4.55%	253		43
		$	1,013			$	865	$	148

Contractual Principal Payments under Long-Term Debt Agreements



Last six months of 2019	$	757
2020	1,350
2021	1,344
2022	1,697
2023	747
After 2023	8,484
	$	14,379

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

6 Months Ended

Jun. 30, 2019

Components of Special Charges

For the three and six months ended June 30, special charges and MTM adjustments consisted of the following (in millions):



	Three Months Ended June 30,						Six Months Ended June 30,
Operating:	2019			2018			2019			2018
Impairment of assets	$	61		$	111		$	69		$	134
Severance and benefit costs	6			11			12			25
(Gains) losses on sale of assets and other special charges	4			7			8			10
Total operating special charges	71			129			89			169
Nonoperating MTM (gains) losses on financial instruments	(34		)	135			(51		)	90
Total special charges and MTM (gains) losses on financial instruments	37			264			38			259
Income tax benefit	(8		)	(59		)	(8		)	(58		)
Total special charges and MTM (gains) losses on financial instruments, net of income tax	$	29		$	205		$	30		$	201

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

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

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

$ 715

$ 693

^[1]

$ 1,403

$ 1,323

^[1]

660

625

^[1]

1,248

1,204

^[1]

560

538

^[1]

1,107

1,062

^[1]

(191)

(163)

^[1]

(379)

(325)

^[1]

^[1]

$ 1,052

$ 683

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

$ 1,344

$ 828

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

$ 4.03

$ 2.48

^[1]

$ 5.09

$ 2.96

^[1]

$ 4.02

$ 2.48

^[1]

$ 5.07

$ 2.95

^[1]

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

$ 681

$ 1,300

603

1,161

557

1,098

(177)

(353)

$ 684

$ 831

$ 2.49

$ 2.97

$ 2.48

$ 2.96

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

$ 12

$ 23

(19)

(36)

(2)

(3)

$ (1)

$ (3)

$ (0.01)

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

$ 0

$ (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

Jun. 30, 2019

Dec. 31, 2018

$ 1,762

$ 1,426

^[1]

708

733

^[1]

Other property and equipment, owned and finance leases

33,890

32,599

^[1]

7,371

6,889

^[1]

Accumulated depreciation and amortization, owned and finance leases

(13,694)

(13,266)

^[1]

4,908

5,262

^[1]

117

123

^[1]

637

719

^[1]

604

553

^[1]

202

224

^[1]

5,034

5,276

^[1]

1,192

828

^[1]

980

1,010

^[1]

$ 8,050

6,715

^[1]

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

1,346

913

Other property and equipment, owned and finance leases

32,636

7,930

Accumulated depreciation and amortization, owned and finance leases

(13,414)

149

619

1,134

814

1,832

6,668

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

(180)

Other property and equipment, owned and finance leases

(37)

(1,041)

Accumulated depreciation and amortization, owned and finance leases

148

5,262

(26)

719

(66)

(910)

5,276

(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

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

$ 4,625

$ 4,152

^[1]

(2,467)

(1,671)

^[1]

996

1,241

^[1]

$ (63)

(35)

^[1]

4,175

(1,734)

1,308

(62)

(23)

(67)

$ 27

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

3 Months Ended

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

Domestic (U.S. and Canada)

$ 11,402

$ 10,777

^[1]

$ 20,991

$ 19,809

^[1]

7,087

6,689

12,962

12,165

Atlantic

2,066

1,965

3,524

3,354

Pacific

1,306

1,285

2,587

2,516

Latin America

Revenue From Contract With Customer [Line Items]

$ 943

$ 838

$ 1,918

$ 1,774

[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

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

Revenue From Contract With Customer [Line Items]

$ 11,402

$ 10,777

^[1]

$ 20,991

$ 19,809

^[1]

Advance Ticket Sales

Revenue recognized

3,900

3,500

3,200

2,900

Ancillary Fees

Revenue From Contract With Customer [Line Items]

Revenue From Contract With Customer [Line Items]

636

555

1,200

1,100

Frequent Flyer

$ 499

$ 480

$ 972

$ 974

[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) - Frequent Flyer - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Frequent Flyer Deferred Revenue [Roll Forward]
Total Frequent flyer deferred revenue - beginning balance	$ 5,138	$ 4,937	$ 5,005	$ 4,783
Miles awarded	682	607	1,289	1,210
Travel miles redeemed (Passenger revenue)	(589)	(519)	(1,027)	(928)
Non-travel miles redeemed (Other operating revenue)	(33)	(36)	(69)	(76)
Total Frequent flyer deferred revenue - ending balance	$ 5,198	$ 4,989	$ 5,198	$ 4,989

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

3 Months Ended

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

Earnings available to common stockholders

$ 1,052

$ 683

$ 1,344

$ 828

Basic weighted-average shares outstanding (in shares)

260.8

274.7

263.9

279.3

Effect of employee stock awards (in shares)

0.8

0.9

1.0

0.9

Diluted weighted-average shares outstanding (in shares)

261.6

275.6

264.9

280.2

$ 4.03

$ 2.48

^[1]

$ 5.09

$ 2.96

^[1]

$ 4.02

$ 2.48

^[1]

$ 5.07

$ 2.95

^[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.

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

Earnings Per Share - Narrative (Details) - USD ($) shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jul. 15, 2019
Earnings Loss Per Share [Line Items]
Repurchases of common stock	$ 536,000,000	$ 407,000,000	$ 1,063,000,000	$ 976,000,000
Open Market Repurchase Program
Earnings Loss Per Share [Line Items]
Number of shares repurchased (in shares)	6.4		12.7
Repurchases of common stock	$ 500,000,000		$ 1,100,000,000
Amount remaining under repurchase programs	$ 700,000,000		$ 700,000,000
Subsequent Event [Member] \| July 2019 Share Repurchase Program [Member]
Earnings Loss Per Share [Line Items]
Authorized amount under share repurchase program					$ 3,000,000,000.0

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

3 Months Ended

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

Deferred Tax

$ (140)

$ (48)

$ (136)

$ (39)

(6)

(2)

(4)

(3)

(7)

(135)

(52)

(135)

(52)

9,802

8,388

^[1]

10,042

^[1],[2]

8,788

^[1]

(20)

(13)

Pension and Other Postretirement Liabilities

10,320

8,691

^[1]

10,320

8,691

^[1]

(654)

(1,063)

(663)

(1,102)

(29)

(24)

(675)

(1,048)

(675)

(1,048)

Investments and Other

(3)

(4)

(6)

(3)

Accumulated Other Comprehensive Income (Loss)

(2)

(793)

(1,114)

^[1]

(803)

^[1]

(1,147)

^[1]

$ (807)

$ (1,102)

^[1]

$ (807)

$ (1,102)

^[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.
[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		6 Months Ended
Income Taxes (Details)	Jun. 30, 2019	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	22.30%	20.10%	21.90%	20.20%

Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 46	$ 57	$ 92	$ 114
Interest cost	57	54	114	108
Expected return on plan assets	(73)	(73)	(145)	(146)
Amortization of unrecognized (gain) loss	29	32	58	65
Amortization of prior service credit	0	0	0	0
Settlement loss	3	0	3	0
Total	62	70	122	141
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	5	6
Interest cost	14	15	29	30
Expected return on plan assets	(1)	0	(1)	0
Amortization of unrecognized (gain) loss	(15)	(8)	(30)	(16)
Amortization of prior service credit	(9)	(10)	(19)	(19)
Settlement loss	0	0	0	0
Total	$ (8)	$ 0	$ (16)	$ 1

Employee Benefit Plans - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
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)		1.1
Vesting period		3 years
Time-Vested RSUs
Compensation and Retirement Disclosure [Abstract]
Awards granted (in shares)		0.8
Performance-Based RSUs
Compensation and Retirement Disclosure [Abstract]
Awards granted (in shares)		0.3
Pension Benefits
Compensation and Retirement Disclosure [Abstract]
Employer contribution to tax-qualified defined benefit pension plans	$ 150	$ 300

Employee Benefit Plans - Information Related to Share-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Employee-related Liabilities [Abstract]
Share-based compensation expense	$ 21	$ 27	$ 37	$ 44
Unrecognized share-based compensation	$ 110		$ 110		$ 68

BRW Term Loan (Details) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2019	Nov. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount of loan receivable	$ 489
BRW
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan amount		$ 456
Number of shares pledged as collateral (in shares)		516.0
Implied value equivalent of shares pledged as collateral (in ADRs)		64.5

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	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 3,221	$ 1,694
Restricted cash	105	105
Equity securities	301	249
Enhanced equipment trust certificates (EETC)	16	18
AVH Derivative Assets	10	11
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	3,221	1,694
Restricted cash	105	105
Equity securities	301	249
Enhanced equipment trust certificates (EETC)	0	0
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
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
AVH Derivative Assets	10	11
Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	1,053	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	1,053	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	697	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	697	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	116	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	116	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	59	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	59	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	107	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	107	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	191	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)	6 Months Ended
	Jun. 30, 2019
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	15 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	3 years
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	Jun. 30, 2019	Dec. 31, 2018
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 14,193	$ 13,445
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	14,691	13,450
Level 1 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	0
Level 2 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	10,915	9,525
Level 3 \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 3,776	$ 3,925

Leases - Components of Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Leases [Abstract]
Operating lease cost	$ 259	$ 312	$ 531	$ 638
Variable and short-term lease cost	661	669	1,267	1,280
Amortization of finance lease assets	18	17	36	40
Interest on finance lease liabilities	32	4	59	9
Sublease income	(9)	(11)	(17)	(21)
Total lease cost	$ 961	$ 991	$ 1,876	$ 1,946

Leases - Narrative (Details) $ in Millions	6 Months Ended
Leases - Narrative (Details) $ in Millions	Jun. 30, 2019 USD ($) aircraft
Lessee, Lease, Description [Line Items]
Additional leases that have not yet commenced \| $	$ 570
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	121
Number of aircraft subject to finance leases	26
Mainline Aircraft \| Minimum
Lessee, Lease, Description [Line Items]
Initial term of operating leases	1 month
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	339
Number of aircraft subject to finance leases	47
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

Jun. 30, 2019

Dec. 31, 2018

^[1]

Operating Leases

$ 428

989

766

634

621

4,331

7,769

2,098

5,671

(637)

$ (719)

5,034

5,276

Finance Leases

157

416

319

(117)

(123)

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

$ 202

$ 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	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term - operating leases	10 years		10 years
Weighted-average remaining lease term - finance leases	5 years		5 years
Weighted-average discount rate - operating leases	5.30%		5.10%
Weighted-average discount rate - finance leases	53.20%		6.70%
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

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Operating cash flows for operating leases

$ 507

$ 552

Operating cash flows for finance leases

Financing cash flows for finance leases

$ 63

$ 35

^[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)	Jun. 30, 2019 commitment Aircraft
Scheduled Aircraft Deliveries
2020 \| Aircraft	17
Airbus A350
Long-term Purchase Commitment [Line Items]
Number of firm commitments	45
Scheduled Aircraft Deliveries
Last Six Months of 2019	0
2020	0
After 2020	45
Boeing 737 MAX
Long-term Purchase Commitment [Line Items]
Number of firm commitments	171
Scheduled Aircraft Deliveries
Last Six Months of 2019	16
2020	28
After 2020	127
Boeing 777-300ER
Long-term Purchase Commitment [Line Items]
Number of firm commitments	4
Scheduled Aircraft Deliveries
Last Six Months of 2019	2
2020	2
After 2020	0
Boeing 787
Long-term Purchase Commitment [Line Items]
Number of firm commitments	18
Scheduled Aircraft Deliveries
Last Six Months of 2019	2
2020	15
After 2020	1
Embraer E175
Long-term Purchase Commitment [Line Items]
Number of firm commitments	38
Scheduled Aircraft Deliveries
Last Six Months of 2019	18
2020	20
After 2020	0

Commitments and Contingencies - Narrative (Details) $ / shares in Units, employee in Thousands, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($) employee commitment aircraft Aircraft	Jun. 30, 2019 USD ($) employee commitment aircraft	Jun. 30, 2019 USD ($) employee commitment aircraft	Dec. 31, 2019 flight	Mar. 13, 2019 aircraft	Mar. 12, 2019 flight	Dec. 31, 2018 USD ($)	Nov. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2018 aircraft
Commitments and Contingencies [Line Items]
Term of capacity purchase agreement	10 years
Remaining term of debt			11 years
Aggregate balance	$ 12,500	$ 12,500	$ 12,500
United Airlines, Inc.
Commitments and Contingencies [Line Items]
Number of employees \| employee	95	95	95
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								144.8
Number of ADRs that may be put into United (in shares) \| shares								18.1
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	$ 1,900	$ 1,900
Floating Rate Debt
Commitments and Contingencies [Line Items]
Debt	3,400	3,400	3,400
Fixed Rate Debt
Commitments and Contingencies [Line Items]
Debt	9	9	$ 9
Loans and Leases from Non-U.S. Entities
Commitments and Contingencies [Line Items]
Remaining term of debt			11 years
Aggregate balance	3,200	3,200	$ 3,200
Aircraft Mortgage Debt
Commitments and Contingencies [Line Items]
Aggregate principal amount of guarantee	$ 139	$ 139	$ 139
Airbus A319
Commitments and Contingencies [Line Items]
Number of aircraft committed to purchase \| aircraft	20	20	20
Boeing 737-700
Commitments and Contingencies [Line Items]
Number of aircraft committed to purchase \| aircraft	19	19	19
Boeing 737 MAX
Commitments and Contingencies [Line Items]
Number of aircraft committed to purchase \| commitment	171	171	171
Number of aircraft grounded under emergency order \| aircraft					14
Number of flights operated using grounded aircraft \| flight						50
Boeing 737 MAX \| Forecast
Commitments and Contingencies [Line Items]
Number of expected flights operating per day prior to grounding order \| flight				110
Embraer E175
Commitments and Contingencies [Line Items]
Number of aircraft committed to purchase \| commitment	38	38	38
Number of aircraft ordered \| aircraft		20
Embraer ERJ 145
Commitments and Contingencies [Line Items]
Number of leased aircraft \| aircraft									54
Number of aircraft purchased \| aircraft									17
Embraer CRJ-550
Commitments and Contingencies [Line Items]
Number of aircraft operated under CPA \| Aircraft	54

Commitments and Contingencies - Summary of Commitments (Details) $ in Billions	Jun. 30, 2019 USD ($) Aircraft
Commitments and Contingencies Disclosure [Abstract]
Last six months of 2019	$ 2.2
2020	5.9
2021	4.0
2022	3.3
2023	2.0
After 2023	6.9
Total commitments	$ 24.3
Number of aircrafts expected to be delivered in 2020 \| Aircraft	17

Commitments and Contingencies - Summary of the Expected Future Payments Through the End of the Terms of CPAs (Details) $ in Billions	Jun. 30, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Last six months of 2019	$ 1.1
2020	2.1
2021	2.1
2022	1.7
2023	1.1
After 2023	4.4
Total	$ 12.5

Debt - Narrative (Details)	1 Months Ended
Debt - Narrative (Details)	May 31, 2019 USD ($)	Feb. 28, 2019 trust	Jun. 30, 2019 USD ($)
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			$ 2,000,000,000.0
4.875% Senior Notes due 2025 \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 350,000,000
Interest rate	4.875%
Redemption price rate	101.00%

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

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

$ 996,000,000

$ 1,241,000,000

^[1]

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

996,000,000

$ 1,241,000,000

^[2]

$ 717,000,000

4.15%

$ 612,000,000

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

612,000,000

105,000,000

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

$ 296,000,000

4.55%

$ 253,000,000

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

253,000,000

43,000,000

United Airlines, Inc. | ETTC

1,013,000,000

865,000,000