10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2018

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                  to                 

Commission File Number	Exact Name of Registrant as Specified in its Charter, Principal Executive Office Address and Telephone Number	State of Incorporation	I.R.S. Employer Identification No.
001-06033	United Continental Holdings, Inc. 233 South Wacker Drive, Chicago, Illinois 60606 (872) 825-4000	Delaware	36-2675207
001-10323	United Airlines, Inc. 233 South Wacker Drive, Chicago, Illinois 60606 (872) 825-4000	Delaware	74-2099724

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

United Continental Holdings, Inc.	Yes  ☒    No  ☐
United Airlines, Inc.	Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this Chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

United Continental Holdings, Inc.	Yes  ☒    No  ☐
United Airlines, Inc.	Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

United Continental Holdings, Inc.	Large accelerated filer ☒	Accelerated filer ☐	Non-accelerated filer ☐	Smaller reporting company ☐	Emerging growth company ☐
United Airlines, Inc.	Large accelerated filer ☐	Accelerated filer ☐	Non-accelerated filer ☒	Smaller reporting company ☐	Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

United Continental Holdings, Inc.	☐
United Airlines, Inc.	☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

United Continental Holdings, Inc.	Yes  ☐    No  ☒
United Airlines, Inc.	Yes  ☐    No  ☒

The number of shares outstanding of each of the issuer’s classes of common stock as of April 12, 2018 is shown below:

United Continental Holdings, Inc.	277,265,493 shares of common stock ($0.01 par value)
United Airlines, Inc.	1,000 shares of common stock ($0.01 par value) (100% owned by United Continental Holdings, Inc.)

OMISSION OF CERTAIN INFORMATION

This combined Quarterly Report on Form 10-Q is separately filed by United Continental Holdings, Inc. and United Airlines, Inc. United Airlines, Inc. meets the conditions set forth in General Instruction H(1)(a) and (b) of Form 10-Q and is therefore filing this form with the reduced disclosure format allowed under that General Instruction.

United Continental Holdings, Inc.

United Airlines, Inc.

Quarterly Report on Form 10-Q

For the Quarterly Period Ended March 31, 2018

		Page
	PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements
	United Continental Holdings, Inc.:
	Statements of Consolidated Operations		3
	Statements of Consolidated Comprehensive Income (Loss)		4
	Consolidated Balance Sheets		5
	Condensed Statements of Consolidated Cash Flows		7
	United Airlines, Inc.:
	Statements of Consolidated Operations		8
	Statements of Consolidated Comprehensive Income (Loss)		9
	Consolidated Balance Sheets		10
	Condensed Statements of Consolidated Cash Flows		12
	Combined Notes to Condensed Consolidated Financial Statements (United Continental Holdings, Inc. and United Airlines, Inc.)		13
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		26
Item 3.	Quantitative and Qualitative Disclosures About Market Risk		32
Item 4.	Controls and Procedures		33
	PART II. OTHER INFORMATION
Item 1.	Legal Proceedings		34
Item 1A.	Risk Factors		34
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds		34
Item 6.	Exhibits		34
Exhibit Index			35
Signatures			36

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS.

UNITED CONTINENTAL HOLDINGS, INC.

STATEMENTS OF CONSOLIDATED OPERATIONS (UNAUDITED)

(In millions, except per share amounts)

	Three Months Ended March 31,
	2018		2017 (a)
Operating revenue:
Passenger revenue	$	8,149	$	7,653
Cargo		293		238
Other operating revenue		590		535
Total operating revenue		9,032		8,426
Operating expense:
Salaries and related costs		2,726		2,636
Aircraft fuel		1,965		1,560
Regional capacity purchase		619		536
Landing fees and other rent		558		544
Depreciation and amortization		541		518
Aircraft maintenance materials and outside repairs		440		454
Distribution expenses		342		319
Aircraft rent		127		179
Special charges (Note 10)		40		51
Other operating expenses		1,398		1,309
Total operating expenses		8,756		8,106
Operating income		276		320
Nonoperating income (expense):
Interest expense		(176)		(162)
Interest capitalized		19		23
Interest income		17		11
Miscellaneous, net		48		(42)
Total nonoperating expense, net		(92)		(170)
Income before income taxes		184		150
Income tax expense		37		51
Net income	$	147	$	99
Earnings per share, basic and diluted	$	0.52	$	0.32

(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. 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

UNITED CONTINENTAL HOLDINGS, INC.

STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (LOSS) (UNAUDITED)

(In millions)

	Three Months Ended March 31,
	2018		2017 (a)
Net income	$	147	$	99
Other comprehensive income (loss), net change related to:
Employee benefit plans, net of taxes		30		(8)
Investments and other, net of taxes		3		1
Total other comprehensive income (loss), net		33		(7)
Total comprehensive income, net	$	180	$	92

(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. 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.

4

UNITED CONTINENTAL HOLDINGS, INC.

CONSOLIDATED BALANCE SHEETS (UNAUDITED)

(In millions, except shares)

	March 31, 2018		December 31, 2017 (a)
ASSETS
Current assets:
Cash and cash equivalents	$	2,404	$	1,482
Short-term investments		2,071		2,316
Receivables, less allowance for doubtful accounts (2018 — $7; 2017 — $7)		1,760		1,340
Aircraft fuel, spare parts and supplies, less obsolescence allowance (2018 — $365; 2017 — $354)		924		924
Prepaid expenses and other		1,128		1,071
Total current assets		8,287		7,133
Operating property and equipment:
Owned—
Flight equipment		29,651		28,692
Other property and equipment		7,193		6,946
Total owned property and equipment		36,844		35,638
Less — Accumulated depreciation and amortization		(11,538)		(11,159)
Total owned property and equipment, net		25,306		24,479
Purchase deposits for flight equipment		1,025		1,344
Capital leases—
Flight equipment		1,205		1,151
Other property and equipment		11		11
Total capital leases		1,216		1,162
Less — Accumulated amortization		(808)		(777)
Total capital leases, net		408		385
Total operating property and equipment, net		26,739		26,208
Other assets:
Goodwill		4,523		4,523
Intangibles, less accumulated amortization (2018 — $1,329; 2017 — $1,313)		3,521		3,539
Restricted cash		95		91
Investments in affiliates and other, net		853		852
Total other assets		8,992		9,005
Total assets	$	44,018	$	42,346

(continued on next page)

5

UNITED CONTINENTAL HOLDINGS, INC.

CONSOLIDATED BALANCE SHEETS (UNAUDITED)

(In millions, except shares)

	March 31, 2018		December 31, 2017 (a)
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Advance ticket sales	$	5,501	$	3,940
Accounts payable		2,399		2,196
Frequent flyer deferred revenue		2,221		2,192
Accrued salaries and benefits		1,637		2,166
Current maturities of long-term debt		1,655		1,565
Current maturities of capital leases		124		128
Other		646		576
Total current liabilities		14,183		12,763
Long-term debt		12,166		11,703
Long-term obligations under capital leases		1,019		996
Other liabilities and deferred credits:
Frequent flyer deferred revenue		2,716		2,591
Postretirement benefit liability		1,593		1,602
Pension liability		1,828		1,921
Deferred income taxes		250		204
Lease fair value adjustment, net		171		198
Other		1,756		1,634
Total other liabilities and deferred credits		8,314		8,150
Commitments and contingencies
Stockholders’ equity:
Preferred stock		—		—
Common stock at par, $0.01 par value; authorized 1,000,000,000 shares; outstanding 279,410,451 and 286,973,195 shares at March 31, 2018 and December 31, 2017, respectively		3		3
Additional capital invested		6,077		6,098
Retained earnings		4,684		4,549
Stock held in treasury, at cost		(1,314)		(769)
Accumulated other comprehensive loss		(1,114)		(1,147)
Total stockholders’ equity		8,336		8,734
Total liabilities and stockholders’ equity	$	44,018	$	42,346

(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). 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.

6

UNITED CONTINENTAL HOLDINGS, INC.

CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS (UNAUDITED)

(In millions)

	Three Months Ended March 31,
	2018		2017
Cash Flows from Operating Activities:
Net cash provided by operating activities	$	1,733	$	547
Cash Flows from Investing Activities:
Capital expenditures		(979)		(691)
Purchases of short-term and other investments		(596)		(774)
Proceeds from sale of short-term and other investments		840		810
Proceeds from sale of property and equipment		3		4
Other, net		2		8
Net cash used in investing activities		(730)		(643)
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt and airport construction financing		696		755
Repurchases of common stock		(529)		(258)
Payments of long-term debt		(189)		(315)
Principal payments under capital leases		(30)		(31)
Other, net		(32)		(65)
Net cash provided (used) in financing activities		(84)		86
Net increase (decrease) in cash, cash equivalents and restricted cash		919		(10)
Cash, cash equivalents and restricted cash at beginning of the period		1,591		2,303
Cash, cash equivalents and restricted cash at end of the period (a)	$	2,510	$	2,293
Investing and Financing Activities Not Affecting Cash:
Property and equipment acquired through the issuance of debt and capital leases	$	74	$	711
Airport construction financing		12		21
(a) The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet:
Reconciliation of cash, cash equivalents and restricted cash:
Current assets:
Cash and cash equivalents	$	2,404	$	2,164
Restricted cash included in Prepaid expenses and other		11		—
Other assets:
Restricted cash		95		129
Total cash, cash equivalents and restricted cash	$	2,510	$	2,293

The accompanying Combined Notes to Condensed Consolidated Financial Statements are an integral part of these statements.

7

UNITED AIRLINES, INC.

STATEMENTS OF CONSOLIDATED OPERATIONS (UNAUDITED)

(In millions)

	Three Months Ended March 31,
	2018		2017 (a)
Operating revenue:
Passenger revenue	$	8,149	$	7,653
Cargo		293		238
Other operating revenue		590		535
Total operating revenue		9,032		8,426
Operating expense:
Salaries and related costs		2,726		2,636
Aircraft fuel		1,965		1,560
Regional capacity purchase		619		536
Landing fees and other rent		558		544
Depreciation and amortization		541		518
Aircraft maintenance materials and outside repairs		440		454
Distribution expenses		342		319
Aircraft rent		127		179
Special charges (Note 10)		40		51
Other operating expenses		1,397		1,309
Total operating expense		8,755		8,106
Operating income		277		320
Nonoperating income (expense):
Interest expense		(176)		(162)
Interest capitalized		19		23
Interest income		17		11
Miscellaneous, net		48		(41)
Total nonoperating expense, net		(92)		(169)
Income before income taxes		185		151
Income tax expense		38		51
Net income	$	147	$	100

(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. 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.

8

UNITED AIRLINES, INC.

STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (LOSS) (UNAUDITED)

(In millions)

	Three Months Ended March  31,
	2018		2017 (a)
Net income	$	147	$	100
Other comprehensive income (loss), net change related to:
Employee benefit plans, net of taxes		30		(8)
Investments and other, net of taxes		3		1
Total other comprehensive income (loss), net		33		(7)
Total comprehensive income, net	$	180	$	93

(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. 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.

9

UNITED AIRLINES, INC.

CONSOLIDATED BALANCE SHEETS (UNAUDITED)

(In millions, except shares)

	March 31, 2018		December 31, 2017 (a)
ASSETS
Current assets:
Cash and cash equivalents	$	2,398	$	1,476
Short-term investments		2,071		2,316
Receivables, less allowance for doubtful accounts (2018 — $7; 2017 — $7)		1,760		1,340
Aircraft fuel, spare parts and supplies, less obsolescence allowance (2018 — $365; 2017 — $354)		924		924
Prepaid expenses and other		1,129		1,071
Total current assets		8,282		7,127
Operating property and equipment:
Owned—
Flight equipment		29,651		28,692
Other property and equipment		7,193		6,946
Total owned property and equipment		36,844		35,638
Less — Accumulated depreciation and amortization		(11,538)		(11,159)
Total owned property and equipment, net		25,306		24,479
Purchase deposits for flight equipment		1,025		1,344
Capital leases—
Flight equipment		1,205		1,151
Other property and equipment		11		11
Total capital leases		1,216		1,162
Less — Accumulated amortization		(808)		(777)
Total capital leases, net		408		385
Total operating property and equipment, net		26,739		26,208
Other assets:
Goodwill		4,523		4,523
Intangibles, less accumulated amortization (2018 — $1,329; 2017 — $1,313)		3,521		3,539
Restricted cash		95		91
Investments in affiliates and other, net		853		852
Total other assets		8,992		9,005
Total assets	$	44,013	$	42,340

(continued on next page)

10

UNITED AIRLINES, INC.

CONSOLIDATED BALANCE SHEETS (UNAUDITED)

(In millions, except shares)

	March 31, 2018		December 31, 2017 (a)
LIABILITIES AND STOCKHOLDER’S EQUITY
Current liabilities:
Advance ticket sales	$	5,501	$	3,940
Accounts payable		2,399		2,196
Frequent flyer deferred revenue		2,221		2,192
Accrued salaries and benefits		1,637		2,166
Current maturities of long-term debt		1,655		1,565
Current maturities of capital leases		124		128
Other		652		581
Total current liabilities		14,189		12,768
Long-term debt		12,166		11,703
Long-term obligations under capital leases		1,019		996
Other liabilities and deferred credits:
Frequent flyer deferred revenue		2,716		2,591
Postretirement benefit liability		1,593		1,602
Pension liability		1,828		1,921
Deferred income taxes		277		231
Lease fair value adjustment, net		171		198
Other		1,756		1,634
Total other liabilities and deferred credits		8,341		8,177
Commitments and contingencies
Stockholder’s equity:
Common stock at par, $0.01 par value; authorized 1,000 shares; issued and outstanding 1,000 shares at both March 31, 2018 and December 31, 2017		—		—
Additional capital invested		1,233		1,787
Retained earnings		8,287		8,146
Accumulated other comprehensive loss		(1,114)		(1,147)
Receivable from related parties		(108)		(90)
Total stockholder’s equity		8,298		8,696
Total liabilities and stockholder’s equity	$	44,013	$	42,340

(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). 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.

11

UNITED AIRLINES, INC.

CONDENSED STATEMENTS OF CONSOLIDATED CASH FLOWS (UNAUDITED)

(In millions)

	Three Months Ended March 31,
	2018		2017
Cash Flows from Operating Activities:
Net cash provided by operating activities	$	1,717	$	535
Cash Flows from Investing Activities:
Capital expenditures		(979)		(691)
Purchases of short-term investments and other investments		(596)		(774)
Proceeds from sale of short-term and other investments		840		810
Proceeds from sale of property and equipment		3		4
Other, net		2		8
Net cash used in investing activities		(730)		(643)
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt and airport construction financing		696		755
Dividend to UAL		(529)		(258)
Payments of long-term debt		(189)		(315)
Principal payments under capital leases		(30)		(31)
Other, net		(16)		(53)
Net cash provided (used) in financing activities		(68)		98
Net increase (decrease) in cash, cash equivalents and restricted cash		919		(10)
Cash, cash equivalents and restricted cash at beginning of the period		1,585		2,297
Cash, cash equivalents and restricted cash at end of the period (a)	$	2,504	$	2,287
Investing and Financing Activities Not Affecting Cash:
Property and equipment acquired through the issuance of debt and capital leases	$	74	$	711
Airport construction financing		12		21
(a) The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet:
Reconciliation of cash, cash equivalents and restricted cash:
Current assets:
Cash and cash equivalents	$	2,398	$	2,158
Restricted cash included in Prepaid expenses and other		11		—
Other assets:
Restricted cash		95		129
Total cash, cash equivalents and restricted cash	$	2,504	$	2,287

The accompanying Combined Notes to Condensed Consolidated Financial Statements are an integral part of these statements.

12

UNITED CONTINENTAL HOLDINGS, INC. AND UNITED AIRLINES, INC.

COMBINED NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

United Continental Holdings, Inc. (together with its consolidated subsidiaries, “UAL” or the “Company”) is a holding company and its principal, wholly-owned subsidiary is United Airlines, Inc. (together with its consolidated subsidiaries, “United”). This Quarterly Report on Form 10-Q is a combined report of UAL and United, including their respective consolidated financial statements. As UAL consolidates United for financial statement purposes, disclosures that relate to activities of United also apply to UAL, unless otherwise noted. United’s operating revenues and operating expenses comprise nearly 100% of UAL’s revenues and operating expenses. In addition, United comprises approximately the entire balance of UAL’s assets, liabilities and operating cash flows. When appropriate, UAL and United are named specifically for their individual contractual obligations and related disclosures and any significant differences between the operations and results of UAL and United are separately disclosed and explained. We sometimes use the words “we,” “our,” “us,” and the “Company” in this report for disclosures that relate to all of UAL and United.

The UAL and United unaudited condensed consolidated financial statements shown here have been prepared as required by the U.S. Securities and Exchange Commission (the “SEC”). Some information and footnote disclosures normally included in financial statements that comply with accounting principles generally accepted in the United States (“GAAP”) have been condensed or omitted as permitted by the SEC. The financial statements include all adjustments, including normal recurring adjustments and other adjustments, which are considered necessary for a fair presentation of the Company’s financial position and results of operations. The UAL and United financial statements should be read together with the information included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. The Company’s quarterly financial data is subject to seasonal fluctuations and historically its second and third quarter financial results, which reflect higher travel demand, are better than its first and fourth quarter financial results.

NOTE 1 - RECENTLY ISSUED ACCOUNTING STANDARDS

The Company adopted FASB Accounting Standards Codification Topic 606, Revenue from Contracts with Customers (the “New Revenue Standard”), effective January 1, 2018 using the full-retrospective method. Topic 606 prescribes that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. For the Company, the most significant impact of the standard is the reclassification of certain ancillary fees from other operating revenue into passenger revenue on the statement of consolidated operations. These ancillary fees are directly related to passenger travel, such as ticket change fees and baggage fees, and are no longer considered distinct performance obligations separate from the passenger travel component. In addition, the ticket change fees, which were previously recognized when received, are now recognized when transportation is provided. Adoption of the standard had no impact on the Company’s consolidated cash flows statements.

The Company adopted Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (the “New Retirement Standard”), effective January 1, 2018 using the full-retrospective method. The New Retirement Standard requires employers to present the service cost component of the net periodic benefit cost in the same income statement line item as other employee compensation costs arising from services rendered during the period. The other components of net benefit cost, including interest cost, expected return on plan assets, amortization of prior service cost/credit and actuarial gain/loss, and settlement and curtailment effects, are to be presented outside of any subtotal of operating income. The Company elected to apply the practical expedient and use the amounts disclosed in Note 5 to the financial statements included in Part I, Item 1 of the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2017 as the estimation basis for applying the retrospective presentation requirements of the standard.

13

The new standards had the same impact on the financial statements of United as they had on the financial statements of UAL. The table below presents the impact of the adoption of the New Revenue Standard and the New Retirement Standard on select accounts and captions of the statement of consolidated operations for the first quarter of 2017 (in millions, except per share amounts):

	Three Months Ended March 31, 2017
	As Previously Reported		New Revenue Standard Adjustments		New Retirement Standard Adjustments		As Adjusted
Passenger revenue	$	7,174	$	479	$	—	$	7,653
Cargo		220		18		—		238
Other operating revenue		1,026		(491)		—		535
Total operating revenue		8,420		6		—		8,426
Salaries and related costs		2,661		—		(25)		2,636
Distribution expenses		307		12		—		319
Other operating expenses		1,332		(23)		—		1,309
Total operating expenses		8,142		(11)		(25)		8,106
Operating income		278		17		25		320
Interest expense		(150)		(12)		—		(162)
Miscellaneous, net		(17)		—		(25)		(42)
Total nonoperating expense, net		(133)		(12)		(25)		(170)
Income before income taxes		145		5		—		150
Income tax expense		49		2		—		51
Net income		96		3		—		99
Earnings per share, basic and diluted		0.31		0.01		—		0.32

14

The table below presents the impact of the adoption of the New Revenue Standard on UAL’s balance sheet accounts and captions as of December 31, 2017 (in millions):

	At December 31, 2017
	As Previously Reported		New  Revenue Standard Adjustments		As Adjusted
Prepaid expenses and other	$	1,051	$	20	$	1,071
Total current assets		7,113		20		7,133
Total assets		42,326		20		42,346
Advance ticket sales		3,876		64		3,940
Frequent flyer deferred revenue		2,176		16		2,192
Other		569		7		576
Total current liabilities		12,676		87		12,763
Frequent flyer deferred revenue - long-term		2,565		26		2,591
Deferred income taxes		225		(21)		204
Total other liabilities and deferred credits		8,145		5		8,150
Retained earnings		4,621		(72)		4,549
Total stockholders’ equity		8,806		(72)		8,734
Total liabilities and stockholders’ equity		42,326		20		42,346

The Company adopted Accounting Standards Update No. 2016-01, Financial Instruments—Overall (Subtopic 825-10) (“ASU 2016-01”) effective January 1, 2018. This standard makes several changes, including the elimination of the available-for-sale classification of equity investments, and requires equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in earnings. The adoption did not have a material impact on our financial statements. See Note 4 and 7 included in this Part I, Item 1 for additional information.

Accounting for Leases. In February 2016, the FASB amended the FASB Accounting Standards Codification and created a new Topic 842, Leases (the “New Lease Standard”). The guidance requires lessees to recognize a right-of-use asset and a lease liability for all leases (with the exception of short-term leases) at the commencement date and recognize expenses on their income statements similar to the current Topic 840, Leases. It is effective for fiscal years and interim periods beginning after December 15, 2018, and early adoption is permitted. Lessees and lessors are required to adopt the New Lease Standard using a modified retrospective approach for all leases existing at or commencing after the date of initial application with an option to use certain practical expedients. We have not completed our evaluation of the impact but believe this standard will have a significant impact on our consolidated balance sheets but is not expected to have a material impact on the Company’s results of operations or cash flows. The primary effect of adopting the new standard will be to record assets and obligations for its operating leases.

NOTE 2 - REVENUE

The Company presents Passenger revenue, Cargo revenue and Other operating revenue on its income statement. Passenger revenue is recognized when transportation is provided and Cargo revenue is recognized when shipments are delivered. Other operating revenue is recognized as the related performance obligations are satisfied.

The Company sells passenger ticket and related ancillary services for mainline and regional flights primarily via credit cards with payments collected by the Company in advance of the performance of related services. The Company initially records ticket sales in its Advance ticket sales liability, deferring revenue recognition until the travel occurs. For travel that has more than one flight segment, the Company deems each segment as a separate performance obligation and recognizes revenue for each segment as travel occurs. Tickets sold by other airlines where the Company provides the transportation are recognized as passenger revenue at the estimated value to be billed to the other airline when travel is provided. Differences between amounts billed and the actual amounts may be rejected and rebilled or written off if the amount recorded was different from the original estimate. When necessary, the Company records a reserve against its billings and payables with other airlines based on historical experience.

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The Company sells certain tickets with connecting flights with one or more segments operated by its other airline partners. For segments operated by its other airline partners, the Company has determined that it is acting as an agent on behalf of the other airlines as they are responsible for their portion of the contract (i.e. transportation of the passenger). The Company, as the agent, recognizes revenue within Other operating revenue at the time of the travel for the net amount representing commission to be retained by the Company for any segments flown by other airlines.

Refundable tickets expire after one year from the date of issuance. Non-refundable tickets generally expire on the date of the intended travel, unless the date is extended by notification from the customer on or before the intended travel date. The Company records breakage revenue on the travel date for its estimate of tickets that will expire unused. To determine breakage, the Company uses its historical experience with refundable and non-refundable expired tickets and other facts, such as recent aging trends, program changes and modifications that could affect the ultimate expiration patterns of tickets. Fees charged in association with changes or extensions to non-refundable tickets are considered part of the Company’s passenger travel obligation. As such, those fees are deferred at the time of collection and recognized at the time the travel is provided.

United initially capitalizes the costs of selling airline travel tickets and then recognizes those costs as Distribution expense at the time of travel. Passenger ticket costs include credit card fees, travel agency and other commissions paid, as well as global distribution systems booking fees.

Ticket Taxes. Certain governmental taxes are imposed on the Company’s ticket sales through a fee included in ticket prices. The Company collects these fees and remits them to the appropriate government agency. These fees are recorded on a net basis and, as a result, are excluded from revenue.

Accounts Receivable. Accounts receivable primarily consist of amounts due from credit card companies, non-airline partners, and cargo transportation customers. We provide an allowance for uncollectible accounts equal to the estimated losses expected to be incurred based on historical write-offs and other specific analyses. Bad debt expense and write-offs were not material for the three months ended March 31, 2018 and 2017.

Advance Ticket Sales. Advance ticket sales represent the Company’s liability to provide air transportation in the future. In both the three months ended March 31, 2018 and 2017, the Company recognized approximately $1.9 billion of passenger revenue for tickets that were included in Advance ticket sales at the beginning of those periods. All tickets sold at any given point of time have travel dates extending up to twelve months. As a result, the balance of the Company’s Advance ticket sales liability represents activity that will be recognized in the next twelve months.

Frequent Flyer Accounting. United’s MileagePlus program builds customer loyalty by offering awards, benefits and services to program participants. Members in this program earn miles for travel on United, United Express, Star Alliance members and certain other airlines that participate in the program. Members can also earn miles by purchasing the goods and services of our network of non-airline partners. We have contracts to sell miles to these partners with the terms extending from one to eight years. These partners include domestic and international credit card issuers, retail merchants, hotels, car rental companies and our participating airline partners. Miles can be redeemed for free (other than taxes and government imposed fees), discounted or upgraded air travel and non-travel awards. Miles expire after 18 months of member account inactivity.

Miles Earned in Conjunction with Travel. When frequent flyers earn miles for flights, the Company recognizes a portion of the ticket sales as revenue when the travel occurs and defers a portion of the ticket sale representing the value of the related miles as a separate performance obligation. The Company determines the estimated selling price of travel and miles as if each element is sold on a separate basis. The total consideration from each ticket sale is then allocated to each of these elements, individually, on a pro rata basis. At the time of travel, the Company records the portion allocated to the miles to Frequent flyer deferred revenue on the Company’s consolidated balance sheet and subsequently recognizes it into revenue when miles are redeemed for air travel and non-travel awards.

The Company’s estimated selling price of miles is based on an equivalent ticket value less breakage, which incorporates the expected redemption of miles, as the best estimate of selling price for these miles. The equivalent ticket value is based on the prior 12 months’ weighted average equivalent ticket value of similar fares as those used to settle award redemptions while taking into consideration such factors as redemption pattern, cabin class, loyalty status and geographic region. The estimated selling price of miles is adjusted by breakage that considers a number of factors, including redemption patterns of various customer groups. The Company reviews its breakage estimates annually based upon the latest available information regarding redemption and expiration patterns. The Company’s estimate of the expected expiration of miles requires significant management judgment. Current and future changes to expiration assumptions or to the expiration policy, or to program rules and program redemption opportunities, may result in material changes to the deferred revenue balance as well as recognized revenues from the program.

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Co-Brand Agreement. United has a significant contract to sell MileagePlus miles to its co-branded credit card partner Chase Bank USA, N.A. (“Chase”). Chase awards miles to MileagePlus members based on their credit card activity. United identified the following significant separately identifiable performance obligations in the co-brand agreement:

• MileagePlus miles awarded - United has a performance obligation to provide MileagePlus cardholders with miles to be used for air travel and non-travel award redemptions. The Company records Passenger revenue related to the travel awards when the transportation is provided and records Other revenue related to the non-travel awards when the goods or services are delivered. The Company records the cost associated with non-travel awards in Other operating revenue.

• Marketing - United’s performance obligation is to provide Chase access to its customer list and the use of its brand. United determined access to its customer list and use of the United brand constitute a single performance obligation by virtue of being highly interdependent and interrelated. Marketing revenue is recorded to Other operating revenue over the term of the co-brand agreement based on customer’s use of the MileagePlus credit card.

• Advertising - United has a performance obligation to provide advertising in support of the MileagePlus card in various customer contact points such as United’s website, email promotions, direct mail campaigns, airport advertising and in-flight advertising. Advertising revenue is recorded to Other operating revenue as advertising is provided.

• Other travel-related benefits - United’s performance obligations are comprised of various items such as waived bag fees, seat upgrades, and lounge passes. Lounge passes are recorded to Other operating revenue as customers use the lounge passes. Bag fees and seat upgrades are recorded to Passenger revenue at the time of the associated travel.

The fair value of the separately identifiable performance obligations is determined using management’s estimated selling price of each component. The objective of using the estimated selling price based methodology is to determine the price at which we would transact a sale if the product or service were sold on a stand-alone basis. Accordingly, we determine our best estimate of selling price by considering multiple inputs and methods including, but not limited to, discounted cash flows, brand value, volume discounts, published selling prices, number of miles awarded and number of miles redeemed. The Company estimated the selling prices and volumes over the term of the co-brand agreement in order to determine the allocation of proceeds to each of the components to be delivered. We also evaluate volumes on an annual basis, which may result in a change in the allocation of the estimated consideration from the co-brand agreement on a prospective basis.

Frequent flyer deferred revenue. Miles in MileagePlus members’ accounts are combined into one homogeneous pool and are thus not separately identifiable, for award redemption purposes, between miles earned in the current period and those in their beginning balance. The Company expects the majority of these miles to be redeemed within the first four years with the highest redemption rate in year one. The table below presents a roll forward of Frequent flyer deferred revenue (in millions):

	Three Months Ended March 31,
	2018		2017
Total Frequent flyer deferred revenue—beginning balance	$	4,783	$	4,889
Total miles awarded		603		488
Travel miles redeemed (Passenger revenue)		(409)		(398)
Non-travel miles redeemed (Other operating revenue)		(40)		(39)
Total Frequent flyer deferred revenue—ending balance	$	4,937	$	4,940

In the three months ended March 31, 2018 and 2017, the Company recognized, in Other operating revenue, $482 million and $403 million, respectively, related to the marketing, advertising and other travel-related benefits of the mileage revenue associated with our various partner agreements including, but not limited to, our Chase co-brand agreement. The portion related to the MileagePlus miles awarded of the total amounts received is deferred and presented in the table above as an increase to the frequent flyer liability. The Company also recognized, in Other operating revenue, $28 million in costs associated with the non-travel miles redeemed in the three months ended March 31, 2018 and 2017.

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Passenger Revenue by Geography. The Company further disaggregates passenger revenue by geographic regions and by mainline versus regional. The following table presents passenger revenue by geographic region and by mainline versus regional for the three months ended March 31 (in millions):

	2018		2017
Mainline	$	3,485	$	3,272
Regional		1,483		1,379
Domestic		4,968		4,651
Atlantic		1,252		1,117
Pacific		1,069		1,053
Latin America		860		832
International		3,181		3,002
Consolidated	$	8,149	$	7,653
Mainline		6,616		6,227
Regional		1,533		1,426
Consolidated	$	8,149	$	7,653

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 $497 million and $478 million of ancillary fees within passenger revenue in the first three months of 2018 and 2017, respectively.

NOTE 3 - EARNINGS PER SHARE

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

	Three Months Ended March 31,
	2018		2017
Earnings available to common stockholders	$	147	$	99
Basic weighted-average shares outstanding		283.9		313.7
Effect of employee stock awards		1.0		0.9
Diluted weighted-average shares outstanding		284.9		314.6
Earnings per share, basic and diluted	$	0.52	$	0.32

The number of antidilutive securities excluded from the computation of diluted earnings per share amounts was not material.

In the three months ended March 31, 2018, UAL repurchased approximately 8.4 million shares of UAL common stock in open market transactions for $0.6 billion. As of March 31, 2018, the Company had approximately $2.4 billion remaining to purchase shares under its share repurchase program. UAL may repurchase shares through the open market, privately negotiated transactions, block trades or accelerated share repurchase transactions from time to time in accordance with applicable securities laws. UAL will repurchase shares of UAL common stock subject to prevailing market conditions, and may discontinue such repurchases at any time. See Part II, Item 2, Unregistered Sales of Equity Securities and Use of Proceeds of this report for additional information.

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NOTE 4 - 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		Income Taxes		Total
Balance at December 31, 2017	$	(1,102)	$	(6)	$	(39)	$	(1,147)
Changes in value		23		(4)		(6)		13
Amounts reclassified to earnings		16		—		(3)		13
Amounts reclassified to retained earnings (a)		—		7		—		7
Net change		39		3		(9)		33
Balance at March 31, 2018	$	(1,063)	$	(3)	$	(48)	$	(1,114)
Balance at December 31, 2016	$	(854)	$	(1)	$	26	$	(829)
Changes in value		(26)		—		10		(16)
Amounts reclassified to earnings		13		2		(6)		9
Net change		(13)		2		4		(7)
Balance at March 31, 2017	$	(867)	$	1	$	30	$	(836)

(a) This amount represents the unrealized loss on the Company’s investment in Azul, S.A. (“Azul”) which was previously classified as an available-for-sale security.

Details for AOCI Components Reclassified to Income	Three Months Ended March 31,				Affected Line Item in  the Statements of Consolidated Operations
	2018		2017
Pension and other postretirement liabilities
Amortization of unrecognized losses and prior service cost (a)	$	16	$	13		Miscellaneous, net
Investments and Other
Reclassifications of losses into earnings related to fuel derivative contracts		—		2		Aircraft fuel

(a) This AOCI component is included in the computation of net periodic pension and other postretirement costs (see Note 5 to the financial statements included in this Part I, Item 1 for additional information).

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NOTE 5 - INCOME TAXES

The Company’s effective tax rate for the three months ended March 31, 2018 and 2017 was 20.3% and 33.6%, respectively. The effective tax rate represents a blend of federal, state and foreign taxes and included the impact of certain nondeductible items. The effective tax rate for the three months ended March 31, 2018 also reflects the reduced federal corporate income tax rate as a result of the enactment of the Tax Cuts and Jobs Act (the “Tax Act”) in December 2017 and the impact of a change in the Company’s mix of domestic and foreign earnings. We continue to analyze the different aspects of the Tax Act which could potentially affect the provisional estimates that were recorded at December 31, 2017.

NOTE 6 - EMPLOYEE BENEFIT PLANS

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

	Pension Benefits				Other Postretirement Benefits				Affected Line Item in the Statements of Consolidated Operations
	2018		2017		2018		2017
Service cost	$	57	$	49	$	3	$	2		Salaries and related costs
Interest cost		54		55		15		17		Miscellaneous, net
Expected return on plan assets		(73)		(60)		—		—		Miscellaneous, net
Amortization of unrecognized (gain) loss and prior service cost (credit)		33		31		(17)		(18)		Miscellaneous, net
Settlement loss		—		1		—		—		Miscellaneous, net
Total	$	71	$	76	$	1	$	1

During the three months ended March 31, 2018, the Company contributed $113 million to its U.S. domestic tax-qualified defined benefit pension plans.

Share-Based Compensation. In the three months ended March 31, 2018, UAL granted share-based compensation awards pursuant to the United Continental Holdings, Inc. 2017 Incentive Compensation Plan. These share-based compensation awards include 1.7 million RSUs consisting of 1.0 million time-vested RSUs and 0.7 million performance-based RSUs. The time-vested RSUs vest pro-rata, on February 28th of each year, over a three-year period from the date of grant. These 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 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, 2020. If this performance condition is achieved, cash payments will be made after the end of the performance period based on the 20-day average closing price of UAL common stock immediately prior to the vesting date. The Company accounts for the performance-based RSUs as liability awards.

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

	Three Months Ended March 31,
	2018		2017
Share-based compensation expense	$	17	$	23
	March 31, 2018		December 31, 2017
Unrecognized share-based compensation	$	102	$	53

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NOTE 7 - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS

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

	March 31, 2018								December 31, 2017
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Cash and cash equivalents	$	2,404	$	2,404	$	—	$	—	$	1,482	$	1,482	$	—	$	—
Short-term investments:
Corporate debt		945		—		945		—		958		—		958		—
Asset-backed securities		606		—		606		—		753		—		753		—
U.S. government and agency notes		110		—		110		—		113		—		113		—
Certificates of deposit placed through an account registry service (“CDARS”)		53		—		53		—		120		—		120		—
Other fixed-income securities		172		—		172		—		188		—		188		—
Other investments measured at net asset value (“NAV”)		185		—		—		—		184		—		—		—
Restricted cash		106		106		—		—		109		109		—		—
Long-term investments:
Equity securities		144		144		—		—		99		99		—		—
Enhanced equipment trust certificates (“EETC”)		19		—		—		19		22		—		—		22

Available-for-sale investment maturities - The short-term investments shown in the table above are classified as available-for-sale, with the exception of investments measured at NAV. As of March 31, 2018, asset-backed securities have remaining maturities of less than one year to approximately 17 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 other securities have maturities of less than one year to approximately three years. The EETC securities mature in 2019.

Restricted cash - Restricted cash primarily includes collateral for letters of credit and collateral associated with obligations for facility leases and workers’ compensation.

Equity securities - Equity securities represent United’s investment in Azul. The Company recognizes changes in Azul’s fair market value in Miscellaneous, net in its 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):

	Fair Value of Debt by Fair Value Hierarchy Level
	March 31, 2018										December 31, 2017
	Carrying Amount		Fair Value								Carrying Amount		Fair Value
			Total		Level 1		Level 2		Level 3				Total		Level 1		Level 2		Level 3
Long-term debt	$	13,821	$	14,068	$	—	$	10,377	$	3,691	$	13,268	$	13,787	$	—	$	10,115	$	3,672

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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.

NOTE 8 - COMMITMENTS AND CONTINGENCIES

Commitments. As of March 31, 2018, United had firm commitments and options to purchase aircraft from The Boeing Company (“Boeing”) and Airbus S.A.S. (“Airbus”) presented in the table below:

Aircraft Type	Number of Firm       Commitments (a)
Airbus A350		45
Boeing 737 MAX		161
Boeing 777-300ER		2
Boeing 787		14
(a) United also has options and purchase rights for additional aircraft.

The aircraft listed in the table above are scheduled for delivery through 2027. To the extent the Company and the aircraft manufacturers with whom the Company has existing orders for new aircraft agree to modify the contracts governing those orders, the amount and timing of the Company’s future capital commitments could change. For the remainder of 2018, United expects to take delivery of two Boeing 777-300ER aircraft, three Boeing 787 aircraft, 10 Boeing 737 MAX aircraft and three used Boeing 767-300ER aircraft. In March 2018, United entered into an agreement to purchase 20 used Airbus A319 aircraft with expected delivery dates scheduled in 2020 and 2021.

The table below summarizes United’s commitments as of March 31, 2018, which primarily relate to the acquisition of aircraft and related spare engines, aircraft improvements and include other capital purchase commitments. Any new firm aircraft orders, including through the exercise of purchase options and purchase rights, will increase the total future capital commitments of the Company.

	(in billions)
Last nine months of 2018	$	2.4
2019		3.7
2020		2.0
2021		2.7
2022		1.8
After 2022		9.8
	$	22.4

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Facility and Other Operating Leases. In March 2018, United executed a new Airline Use and Lease Agreement at O’Hare International Airport with the City of Chicago with a lease term of approximately 15 years effective May 12, 2018 through December 31, 2033.

The table below summarizes the Company’s scheduled future minimum lease payments under facility operating leases having initial or remaining noncancelable lease terms of more than one year as of March 31, 2018 (in millions):

	Facility and Other Operating Leases
Last nine months of 2018	$	1,010
2019		1,209
2020		1,302
2021		1,068
2022		930
After 2022		7,576
	$	13,095

Guarantees. As of March 31, 2018, United is the guarantor of approximately $2.0 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 approximately $1.4 billion of these obligations are accounted for as operating leases with the associated expense recorded on a straight-line basis resulting in ratable accrual of the lease obligation over the expected lease term. The leasing arrangements associated with approximately $454 million of these obligations are accounted for as capital leases. All of these bonds are due between 2019 and 2038.

Increased Cost Provisions. In the Company’s financing transactions that include loans, the Company typically agrees to reimburse lenders for any reduced returns with respect to the loans due to any change in capital requirements and, in the case of loans in which the interest rate is based on the London Interbank Offered Rate, for certain other increased costs that the lenders incur in carrying these loans as a result of any change in law, subject, in most cases, to obligations of the lenders to take certain limited steps to mitigate the requirement for, or the amount of, such increased costs. At March 31, 2018, the Company had $3.4 billion of floating rate debt and $52 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 $3.3 billion, the Company bears the risk of any change in tax laws that would subject loan or lease payments thereunder to non-U.S. entities to withholding taxes, subject to customary exclusions.

As of March 31, 2018, United is the guarantor of $154 million of aircraft mortgage debt issued by one of United’s regional carriers. The aircraft mortgage debt is subject to similar increased cost provisions as described above for the Company’s debt, and the Company would potentially be responsible for those costs under the guarantees.

Labor Negotiations. As of March 31, 2018, United had approximately 90,800 employees, of whom approximately 79% were represented by various U.S. labor organizations. UNITE HERE is attempting to organize United’s Catering Operations employees, who are currently unrepresented, and filed an application to do so with the National Mediation Board on January 24, 2018.

NOTE 9 - DEBT

As of March 31, 2018, a substantial portion of the Company’s assets, principally aircraft, route authorities, airport slots and loyalty program intangible assets, was pledged under various loan and other agreements. As of March 31, 2018, UAL and United were in compliance with their respective debt covenants. As of March 31, 2018, United had its entire capacity of $2.0 billion available under the revolving credit facility of the Company’s Amended and Restated Credit and Guaranty Agreement (as amended, the “2017 Credit Agreement”).

EETCs. In February 2018, United created two new EETC pass-through trusts, each of which issued pass-through certificates. The proceeds of the issuance of the pass-through certificates are used to purchase equipment notes issued by United and secured by its aircraft. The Company records the debt obligation upon issuance of the equipment notes rather than upon the initial issuance of the pass-through certificates. The pass-through certificates represent fractional undivided interests in the respective pass-through trusts and are not obligations of United. The payment obligations under the equipment notes are those of United. Proceeds received from the sale of pass-through certificates are initially held by a depositary in escrow for the benefit of the certificate holders until United issues equipment notes to the trust, which purchases such notes with a portion of

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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 2018 are as follows (in millions, except stated interest rate):

EETC Date	Class	Principal		Final expected distribution date	Stated interest rate		Total proceeds  received from issuance of debt during 2018 and recorded as debt as of March 31, 2018		Remaining proceeds  from issuance of debt to be received in future periods
February 2018	AA	$	677	March 2030		3.50%	$	476	$	201
February 2018	A		258	March 2030		3.70%		181		77
		$	935				$	657	$	278

The table below presents the Company’s contractual principal payments (not including debt discount or debt issuance costs) at March 31, 2018 under then-outstanding long-term debt agreements (in millions):

Last nine months of 2018	$	1,380
2019		1,218
2020		1,207
2021		1,194
2022		1,529
After 2022		7,457
	$	13,985

NOTE 10 - SPECIAL CHARGES

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

	Three Months Ended March 31,
Operating:	2018		2017
Severance and benefit costs	$	14	$	37
Impairment of assets		23		—
(Gains) losses on sale of assets and other special charges		3		14
Special charges		40		51
Income tax benefit related to special charges		(9)		(18)
Total special charges, net of tax	$	31	$	33

During the three months ended March 31, 2018 and 2017, the Company recorded severance and benefit costs related to a voluntary early-out program for its technicians and related employees represented by the International Brotherhood of Teamsters (the “IBT”) of $8 million ($7 million net of taxes) and $21 million ($14 million net of taxes) respectively. In the first quarter of 2017, approximately 1,000 technicians and related employees elected to voluntarily separate from the Company and will receive a severance payment, with a maximum value of $100,000 per participant, based on years of service, with retirement dates through early 2019. Also during the three months ended March 31, 2018 and 2017, the Company recorded severance primarily related to its management reorganization initiative of $6 million ($4 million net of taxes) and $16 million ($10 million net of taxes) respectively.

During the three months ended March 31, 2018, the Company recorded a $23 million ($17 million net of taxes) fair value adjustment for aircraft purchased off lease and impairments related to certain fleet types and certain international slots no longer in use.

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Accrual Activity

The severance-related accrual as of March 31, 2018 is primarily related to severance and other compensation expense associated with voluntary employee early retirement programs and is expected to be mostly paid through early 2019. The accrual balance for future lease payments on permanently grounded aircraft as of March 31, 2018 is expected to be mostly paid through 2025. Activity related to these accruals is as follows (in millions):

	Severance and Benefits		Permanently Grounded Aircraft
Balance at December 31, 2017	$	37	$	22
Accrual		14		—
Payments		(19)		(1)
Balance at March 31, 2018	$	32	$	21
	Severance and Benefits		Permanently Grounded Aircraft
Balance at December 31, 2016	$	14	$	41
Accrual		37		—
Payments		(23)		(1)
Balance at March 31, 2017	$	28	$	40

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.

Overview

United Continental Holdings, Inc. (together with its consolidated subsidiaries, “UAL” or the “Company”) is a holding company and its principal, wholly-owned subsidiary is United Airlines, Inc. (together with its consolidated subsidiaries, “United”). This Quarterly Report on Form 10-Q is a combined report of UAL and United including their respective consolidated financial statements. As UAL consolidates United for financial statement purposes, disclosures that relate to activities of United also apply to UAL, unless otherwise noted. United’s operating revenues and operating expenses comprise nearly 100% of UAL’s revenues and operating expenses. In addition, United comprises approximately the entire balance of UAL’s assets, liabilities and operating cash flows. When appropriate, UAL and United are named specifically for their individual contractual obligations and related disclosures and any significant differences between the operations and results of UAL and United are separately disclosed and explained. We sometimes use the words “we,” “our,” “us,” and the “Company” in this report for disclosures that relate to all of UAL and United.

The Company transports people and cargo through its mainline operations, which utilize jet aircraft with at least 118 seats, and regional operations, which utilize smaller aircraft that are operated under contract by United Express carriers. The Company serves virtually every major market around the world, either directly or through participation in Star Alliance^®, the world’s largest airline alliance. UAL, through United and its regional carriers, operates approximately 4,600 flights a day to 354 airports across five continents.

First Quarter Highlights

• First quarter 2018 net income was $147 million, or $0.52 diluted earnings per share, as compared to net income of $99 million, or diluted earnings per share of $0.32, in the first quarter of 2017.

• Passenger revenue increased 6.5% to $8.1 billion during the first quarter of 2018 as compared to the first quarter of 2017.

• First quarter 2018 aircraft fuel cost increased $405 million, 26.0% year-over-year.

• Unrestricted liquidity at March 31, 2018 was $6.5 billion, including $2.0 billion of undrawn commitments under the Company’s revolving credit facility.

• In the three months ended March 31, 2018, UAL repurchased approximately 8.4 million shares of its common stock in open market transactions for $0.6 billion. As of March 31, 2018, the Company had approximately $2.4 billion remaining to purchase shares under its share repurchase program.

• Consolidated traffic increased 4.7% and consolidated capacity increased 3.6% during the first quarter of 2018 as compared to the first quarter of 2017. The Company’s load factor for the first quarter of 2018 was 80.4%.

• The Company took delivery of four Boeing 787-9 aircraft and two Boeing 777-300ER aircraft during the first quarter of 2018.

Outlook

In 2018, the Company expects its consolidated available seat miles to grow between 4.5% and 5.5% year-over-year. Most of this growth will be concentrated in our domestic network, especially in our mid-continent hubs. We believe greater scale and connectivity at our hubs reinforces our relevance and value proposition to our customers. Rebanking at our hubs is expected to drive significant additional connection opportunities. We will also expand flights in non-peak times of the year to more efficiently use our aircraft and facilities with the objective of driving an increase in profitability.

The price of jet fuel remains volatile. Based on projected fuel consumption in 2018, a one dollar change in the price of a barrel of crude oil would change the Company’s annual fuel expense by approximately $97 million.

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RESULTS OF OPERATIONS

The following discussion provides an analysis of our results of operations and reasons for material changes therein for the three months ended March 31, 2018 as compared to the corresponding period in 2017.

First Quarter 2018 Compared to First Quarter 2017

The Company recorded net income of $147 million in the first quarter of 2018 as compared to net income of $99 million in the first quarter of 2017. The Company considers a key measure of its performance to be operating income, which was $276 million for the first quarter of 2018, as compared to $320 million for the first quarter of 2017, a $44 million decrease year-over-year. Significant components of the Company’s operating results for the three months ended March 31 are as follows (in millions, except percentage changes):

	2018		2017		Increase (Decrease)			% Change
Operating revenue	$	9,032	$	8,426	$	606			7.2
Operating expense		8,756		8,106		650			8.0
Operating income		276		320		(44)			(13.8)
Nonoperating expense		(92)		(170)		(78)			(45.9)
Income tax expense		37		51		(14)			(27.5)
Net income	$	147	$	99	$	48			48.5
Certain consolidated statistical information for the Company’s operations for the three months ended March 31 is as follows:
	2018		2017		Increase (Decrease)			% Change
Passengers (thousands) (a)		34,495		33,105		1,390			4.2
Revenue passenger miles (“RPMs”) (millions) (b)		49,849		47,611		2,238			4.7
Available seat miles (“ASMs”) (millions) (c)		61,977		59,808		2,169			3.6
Passenger load factor (d)		80.4%		79.6%		0.8	pts.		N/A
Passenger revenue per available seat mile (“PRASM”) (cents)		13.15		12.80		0.35			2.7
Average yield per revenue passenger mile (“Yield”) (cents) (e)		16.35		16.07		0.28			1.7
Cost per available seat mile (“CASM”) (cents)		14.13		13.55		0.58			4.3
Average price per gallon of fuel, including fuel taxes	$	2.11	$	1.71	$	0.40			23.4
Fuel gallons consumed (millions)		932		910		22			2.4
Average full-time equivalent employees		85,600		85,200		400			0.5

(a) The number of revenue passengers measured by each flight segment flown.

(b) The number of scheduled miles flown by revenue passengers.

(c) The number of seats available for passengers multiplied by the number of scheduled miles those seats are flown.

(d) Revenue passenger miles divided by available seat miles.

(e) The average passenger revenue received for each revenue passenger mile flown.

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Operating Revenue. The table below shows year-over-year comparisons by type of operating revenue for the three months ended March 31 (in millions, except for percentage changes):

	2018		2017		Increase (Decrease)		% Change
Passenger revenue		8,149		7,653		496		6.5
Cargo		293		238		55		23.1
Other operating revenue		590		535		55		10.3
Total operating revenue	$	9,032	$	8,426	$	606		7.2

The table below presents selected first quarter passenger revenue and operating data, broken out by geographic region, expressed as year-over-year changes:

	Domestic		Atlantic		Pacific		Latin		Total
Increase (decrease) from 2017:
Passenger revenue (in millions)	$	317	$	135	$	16	$	28	$	496
Passenger revenue		6.8 %		12.1 %		1.5 %		3.4 %		6.5 %
Average fare per passenger		1.6 %		1.4 %		5.0 %		5.3 %		2.2 %
Yield		2.2 %		1.0 %		(1.9)%		2.9 %		1.7 %
PRASM		1.6 %		8.8 %		(1.5)%		5.1 %		2.7 %
Passengers		5.1 %		10.5 %		(3.4)%		(1.9)%		4.2 %
RPMs (traffic)		4.5 %		11.0 %		3.4 %		0.4 %		4.7 %
ASMs (capacity)		5.2 %		3.1 %		3.0 %		(1.6)%		3.6 %
Passenger load factor (points)		(0.5)		5.2		0.3		1.7		0.8

Passenger revenue in the first quarter of 2018 increased $496 million, or 6.5%, as compared to the year-ago period primarily due to a 4.7% increase in traffic and 0.8 points increase in load factor. First quarter 2018 PRASM and yield increased 2.7% and 1.7%, respectively, compared to the first quarter of 2017.

Cargo revenue increased $55 million, or 23.1%, in the first quarter of 2018 as compared to the year-ago period primarily due to higher yield and volume.

Other operating revenue increased $55 million, or 10.3%, in the first quarter of 2018 as compared to the year-ago period primarily due to an approximately $50 million one-time payment of MileagePlus related revenue.

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Operating Expenses. The table below includes data related to the Company’s operating expenses for the three months ended March 31 (in millions, except for percentage changes):

	2018		2017		Increase (Decrease)		% Change
Salaries and related costs	$	2,726	$	2,636	$	90		3.4
Aircraft fuel		1,965		1,560		405		26.0
Regional capacity purchase		619		536		83		15.5
Landing fees and other rent		558		544		14		2.6
Depreciation and amortization		541		518		23		4.4
Aircraft maintenance materials and outside repairs		440		454		(14)		(3.1)
Distribution expenses		342		319		23		7.2
Aircraft rent		127		179		(52)		(29.1)
Special charges		40		51		(11)		NM
Other operating expenses		1,398		1,309		89		6.8
Total operating expenses	$	8,756	$	8,106	$	650		8.0

Salaries and related costs increased $90 million, or 3.4%, in the first quarter of 2018 as compared to the year-ago period primarily due to contractually higher pay rates and benefit expenses driven by collective bargaining agreements and a 0.5% increase in average full-time equivalent employees.

Aircraft fuel expense increased $405 million, or 26.0%, year-over-year primarily due to a 23.4% increase in the average price per gallon of aircraft fuel in the first quarter of 2018 compared to the year-ago period.

Regional capacity purchase increased $83 million, or 15.5%, in the first quarter of 2018 as compared to the year-ago period due to a 6.3% increase in regional capacity related to the Company’s initiative to improve connectivity at its domestic hubs.

Aircraft rent decreased $52 million, or 29.1%, in the first quarter of 2018 as compared to the year-ago period, primarily due to the purchase of leased aircraft and lease term expirations.

Other operating expenses increased $89 million, or 6.8%, in the first quarter of 2018 as compared to the year-ago period due to increases in purchased services related to our airport operations, technology initiatives, trucking and handling of cargo shipments, and due to increased volumes of onboard food and beverages.

Details of the Company’s special charges include the following for the three months ended March 31 (in millions):

	2018		2017
Severance and benefit costs	$	14	$	37
Impairment of assets		23		—
(Gains) losses on sale of assets and other special charges		3		14
Special charges	$	40	$	51

See Note 10 to the financial statements included in Part I, Item 1 of this report for additional information.

Nonoperating Income (Expense). The following table illustrates the year-over-year dollar and percentage changes in the Company’s nonoperating income (expense) for the three months ended March 31 (in millions, except for percentage changes):

	2018		2017		Increase (Decrease)		% Change
Interest expense	$	(176)	$	(162)	$	14		8.6
Interest capitalized		19		23		(4)		(17.4)
Interest income		17		11		6		54.5
Miscellaneous, net		48		(42)		(90)		NM
Total	$	(92)	$	(170)	$	(78)		(45.9)

Miscellaneous, net includes, in the first quarter of 2018, a $45 million gain for the change in market value of the Company’s equity investment in Azul, S.A. and $12 million of non-service cost component of the pension and postretirement net periodic benefit cost as compared to $26 million in the year-ago period.

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Income Taxes. See Note 5 to the financial statements included in Part I, Item 1 of this report for information related to income taxes.

LIQUIDITY AND CAPITAL RESOURCES

Current Liquidity

As of March 31, 2018, the Company had $4.5 billion in unrestricted cash, cash equivalents and short-term investments, as compared to $3.8 billion at December 31, 2017. The Company had its entire commitment capacity of $2.0 billion under the revolving credit facility of the Company’s Amended and Restated Credit and Guaranty Agreement available for borrowings. At March 31, 2018, the Company also had $106 million of restricted cash and cash equivalents, which is primarily collateral for letters of credit and collateral associated with obligations for facility leases and workers’ compensation.

We have a significant amount of fixed obligations, including debt, aircraft leases and financings, leases of airport property and other facilities, and pension funding obligations. At March 31, 2018, the Company had approximately $15.0 billion of debt and capital lease obligations, including $1.8 billion that will become due in the next 12 months. In addition, we have substantial noncancelable commitments for capital expenditures, including the acquisition of certain new aircraft and related spare engines. As of March 31, 2018, our current liabilities exceeded our current assets by approximately $5.9 billion. However, approximately $7.7 billion of our current liabilities are related to our advance ticket sales and frequent flyer deferred revenue, both of which largely represent revenue to be recognized for travel in the near future and not actual cash outlays. The deficit in working capital does not have an adverse impact to our cash flows, liquidity or operations.

As of March 31, 2018, United had firm commitments and options to purchase aircraft from The Boeing Company (“Boeing”) and Airbus S.A.S. (“Airbus”) presented in the table below:

Aircraft Type	Number of Firm          Commitments (a)
Airbus A350		45
Boeing 737 MAX		161
Boeing 777-300ER		2
Boeing 787		14
(a) United also has options and purchase rights for additional aircraft.

The aircraft listed in the table above are scheduled for delivery through 2027. To the extent the Company and the aircraft manufacturers with whom the Company has existing orders for new aircraft agree to modify the contracts governing those orders, the amount and timing of the Company’s future capital commitments could change. For the remainder of 2018, United expects to take delivery of two Boeing 777-300ER aircraft, three Boeing 787 aircraft, 10 Boeing 737 MAX aircraft and three used Boeing 767-300ER aircraft. In March 2018, United entered into an agreement to purchase 20 used Airbus A319 aircraft with expected delivery dates scheduled in 2020 and 2021.

As of March 31, 2018, UAL and United have total capital commitments primarily related to the acquisition of aircraft and related spare engines, aircraft improvements and include other capital purchase commitments for approximately $22.4 billion, of which approximately $2.4 billion, $3.7 billion, $2.0 billion, $2.7 billion, $1.8 billion and $9.8 billion are due in the last nine months of 2018 and for the full year for 2019, 2020, 2021, 2022 and thereafter, respectively. Any new firm aircraft orders, including through the exercise of purchase options and purchase rights, will increase the total future capital commitments of the Company.

See Note 9 to the financial statements included in Part I, Item 1 of this report for additional information on aircraft financing. The Company has also secured backstop financing commitments from certain of its aircraft manufacturers for a limited number of its future aircraft deliveries, subject to certain customary conditions. Financing may be necessary to satisfy the Company’s capital commitments for its firm order aircraft and other related capital expenditures.

As of March 31, 2018, a substantial portion of the Company’s assets, principally aircraft, route authorities, airport slots and loyalty program intangible assets, was pledged under various loan and other agreements. We must sustain our profitability and/or access the capital markets to meet our significant long-term debt and capital lease obligations and future commitments for capital expenditures, including the acquisition of aircraft and related spare engines.

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Credit Ratings. As of the filing date of this report, UAL and United had the following corporate credit ratings:

	S&P	Moody’s	Fitch
UAL	BB	Ba2	BB
United	BB	*	BB
* The credit agency does not issue corporate credit ratings for subsidiary entities.

These credit ratings are below investment grade levels. Downgrades from these rating levels, among other things, could restrict the availability or increase the cost of future financing for the Company.

Sources and Uses of Cash

Operating Activities. Cash flow provided by operations was $1.7 billion for the three months ended March 31, 2018 compared to $0.5 billion in the same period in 2017. Operating income for the first three months of 2018 and 2017 was $0.3 billion. Working capital items changed by approximately $1.2 billion year-over-year primarily due to a $0.3 billion increase in advance ticket sales associated with our overall traffic growth, a $0.3 billion decrease in employee incentive payments in the first three months of 2018 as compared to the year-ago period, a $0.2 billion increase in mileage sales to our co-branded credit card partner due to full utilization of the pre-purchased miles in 2017, and a $0.3 billion increase related to timing of accounts payable.

Investing Activities. Capital expenditures were approximately $1.0 billion and $0.7 billion in the three months ended March 31, 2018 and 2017, respectively. Capital expenditures for the three months ended March 31, 2018 were primarily attributable to additions of new aircraft, aircraft improvements, and increases in facility and information technology assets.

Financing Activities. During the three months ended March 31, 2018, the Company made debt and capital lease payments of $0.2 billion. In the three months ended March 31, 2018, United received and recorded $0.7 billion of proceeds as debt from the EETC pass-through trusts established in February 2018. See Note 9 to the financial statements included in Part I, Item 1 of this report for additional information.

Share Repurchase Programs. In the three months ended March 31, 2018, UAL repurchased approximately 8.4 million shares of UAL common stock in open market transactions for $0.6 billion. As of March 31, 2018, the Company had approximately $2.4 billion remaining to purchase shares under its share repurchase program.

UAL may repurchase shares through the open market, privately negotiated transactions, block trades or accelerated share repurchase transactions from time to time in accordance with applicable securities laws. UAL will repurchase shares of UAL common stock subject to prevailing market conditions, and may discontinue such repurchases at any time. See Part II, Item 2, Unregistered Sales of Equity Securities and Use of Proceeds of this report for additional information.

Commitments, Contingencies and Liquidity Matters. As described in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017 (the “2017 Annual Report”), the Company’s liquidity may be adversely impacted by a variety of factors, including, but not limited to, pension funding obligations, reserve requirements associated with credit card processing agreements, guarantees, commitments and contingencies.

See the 2017 Annual Report and Notes 6, 8, 9 to the financial statements contained in Part I, Item 1 of this report for additional information.

CRITICAL ACCOUNTING POLICIES

See “Critical Accounting Policies” in Part II, Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations in the 2017 Annual Report. Also see Note 2 to the financial statements contained in Part I, Item 1 of this report for a discussion of the Company’s updated accounting policies on Revenue Recognition and Frequent Flyer Accounting.

FORWARD-LOOKING INFORMATION

Certain statements throughout Part I, Item 2, Management’s Discussion and Analysis of Financial Condition and Results of Operations and elsewhere in this report are forward-looking and thus reflect the Company’s current expectations and beliefs with respect to certain current and future events and anticipated financial and operating performance. Such forward-looking statements are and will be subject to many risks and uncertainties relating to the Company’s operations and business environment that may cause actual results to differ materially from any future results expressed or implied in such forward-looking statements. Words such as “expects,” “will,” “plans,” “anticipates,” “indicates,” “believes,” “estimates,” “forecast,” “guidance,” “outlook,” “goals” and similar expressions are intended to identify forward-looking statements.

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Additionally, forward-looking statements include statements that do not relate solely to historical facts, such as statements which identify uncertainties or trends, discuss the possible future effects of current known trends or uncertainties, or which indicate that the future effects of known trends or uncertainties cannot be predicted, guaranteed or assured. All forward-looking statements in this report are based upon information available to us on the date of this report. We undertake no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events, changed circumstances or otherwise, except as required by applicable law.

Our actual results could differ materially from these forward-looking statements due to numerous factors including, without limitation, the following: general economic conditions (including interest rates, foreign currency exchange rates, investment or credit market conditions, crude oil prices, costs of aircraft fuel and energy refining capacity in relevant markets); economic and political instability and other risks of doing business globally, including political developments that may impact our operations in certain countries; demand for travel and the impact that global economic and political conditions have on customer travel patterns; competitive pressures on pricing and on demand; demand for transportation in the markets in which we operate; our capacity decisions and the capacity decisions of our competitors; the effects of any hostilities, act of war or terrorist attack; the effects of any technology failures or cybersecurity breaches; the impact of regulatory, investigative and legal proceedings and legal compliance risks; disruptions to our regional network; the ability of other air carriers with whom we have alliances or partnerships to provide the services contemplated by the respective arrangements with such carriers; costs associated with any modification or termination of our aircraft orders; potential reputational or other impact from adverse events in our operations, the operations of our regional carriers or the operations of our code share partners; our ability to attract and retain customers; our ability to execute our operational plans and revenue-generating initiatives, including optimizing our revenue; our ability to control our costs, including realizing benefits from our resource optimization efforts, cost reduction initiatives and fleet replacement programs; the impact of any management changes; our ability to cost-effectively hedge against increases in the price of aircraft fuel if we decide to do so; any potential realized or unrealized gains or losses related to any fuel or currency hedging programs; labor costs; our ability to maintain satisfactory labor relations and the results of any collective bargaining agreement process with our union groups; any disruptions to operations due to any potential actions by our labor groups; an outbreak of a disease that affects travel demand or travel behavior; U.S. or foreign governmental legislation, regulation and other actions (including Open Skies agreements and environmental regulations); industry consolidation or changes in airline alliances; our ability to comply with the terms of our various financing arrangements; the costs and availability of financing; our ability to maintain adequate liquidity; the costs and availability of aviation and other insurance; weather conditions; our ability to utilize our net operating losses to offset future taxable income; the impact of changes in tax laws; the success of our investments in airlines in other parts of the world; and other risks and uncertainties set forth under Part I, Item 1A., Risk Factors, of our 2017 Annual Report, as well as other risks and uncertainties set forth from time to time in the reports we file with the U.S. Securities and Exchange Commission (the “SEC”).

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

There have been no material changes in market risk from the information provided in Part II, Item 7A, Quantitative and Qualitative Disclosures About Market Risk, in our 2017 Annual Report.

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ITEM 4. CONTROLS AND PROCEDURES.

Evaluation of Disclosure Control and Procedures

UAL and United each maintain controls and procedures that are designed to ensure that information required to be disclosed in the reports filed or submitted by UAL and United to the SEC is recorded, processed, summarized and reported, within the time periods specified by the SEC’s rules and forms, and is accumulated and communicated to management, including the Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure. The management of UAL and United, including the Chief Executive Officer and Chief Financial Officer, performed an evaluation to conclude with reasonable assurance that UAL’s and United’s disclosure controls and procedures were designed and operating effectively to report the information each company is required to disclose in the reports they file with the SEC on a timely basis. Based on that evaluation, the Chief Executive Officer and the Chief Financial Officer of UAL and United have concluded that as of March 31, 2018, disclosure controls and procedures were effective.

Changes in Internal Control over Financial Reporting During the Quarter Ended March 31, 2018

During the three months ended March 31, 2018, there were no changes in UAL’s or United’s internal control over financial reporting that materially affected, or are reasonably likely to materially affect, their internal control over financial reporting (as defined in rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934).

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PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

See Part I, Item 3, Legal Proceedings, of the 2017 Annual Report for a description of legal proceedings.

ITEM 1A. RISK FACTORS

See Part I, Item 1A, Risk Factors, of the 2017 Annual Report for a detailed discussion of the risk factors affecting UAL and United.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS.

(a) None

(b) None

(c) The following table presents repurchases of UAL common stock made in the first quarter of fiscal year 2018:

Period	Total number of shares purchased (a)(b)		Average price paid per share (b)(c)		Total number of shares purchased as part of publicly announced plans or programs (a)		Approximate dollar value of shares that may yet be purchased under the plans or programs (in millions) (a)
January 2018		1,051,444	$	66.57		1,051,444	$	2,930
February 2018		3,101,048		66.27		3,101,048		2,725
March 2018		4,255,515		68.89		4,255,515		2,431
Total		8,408,007				8,408,007

(a) In December 2017, UAL’s Board of Directors authorized a $3.0 billion share repurchase program to acquire UAL’s common stock. As of March 31, 2018, the Company had approximately $2.4 billion remaining to purchase shares under its share repurchase program. UAL may repurchase shares through the open market, privately negotiated transactions, block trades or accelerated share repurchase transactions from time to time in accordance with applicable securities laws.

(b) The table does not include shares withheld from employees to satisfy certain tax obligations due upon the vesting of restricted stock awards and restricted stock units. The United Continental Holdings, Inc. 2017 Incentive Compensation Plan and the United Continental Holdings, Inc. 2008 Incentive Compensation Plan each provide for the withholding of shares to satisfy tax obligations due upon the vesting of restricted stock. However, these plans do not specify a maximum number of shares that may be withheld for this purpose. A total of 243,003 shares were withheld under these plans in the first quarter of 2018 at an average price per share of $67.72. These shares of common stock withheld to satisfy tax withholding obligations may be deemed to be “issuer purchases” of shares that are required to be disclosed pursuant to this Item.

(c) Average price paid per share is calculated on a settlement basis and excludes commission.

ITEM 6. EXHIBITS.

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EXHIBIT INDEX

Exhibit No.	Registrant	Exhibit
12.1	UAL	United Continental Holdings, Inc. and Subsidiary Companies Computation of Ratio of Earnings to Fixed Charges
12.2	United	United Airlines, Inc. and Subsidiary Companies Computation of Ratio of Earnings to Fixed Charges
31.1	UAL	Certification of the Principal Executive Officer of United Continental Holdings, Inc. Pursuant to 15 U.S.C. 78m(a) or 78o(d) (Section 302 of the Sarbanes-Oxley Act of 2002)
31.2	UAL	Certification of the Principal Financial Officer of United Continental Holdings, Inc. Pursuant to 15 U.S.C. 78m(a) or 78o(d) (Section 302 of the Sarbanes-Oxley Act of 2002)
31.3	United	Certification of the Principal Executive Officer of United Airlines, Inc. Pursuant to 15 U.S.C. 78m(a) or 78o(d) (Section 302 of the Sarbanes-Oxley Act of 2002)
31.4	United	Certification of the Principal Financial Officer of United Airlines, Inc. Pursuant to 15 U.S.C. 78m(a) or 78o(d) (Section 302 of the Sarbanes-Oxley Act of 2002)
32.1	UAL	Certification of the Chief Executive Officer and Chief Financial Officer of United Continental Holdings, Inc. Pursuant to 18 U.S.C. 1350 (Section 906 of the Sarbanes-Oxley Act of 2002)
32.2	United	Certification of the Chief Executive Officer and Chief Financial Officer of United Airlines, Inc. Pursuant to 18 U.S.C. 1350 (Section 906 of the Sarbanes-Oxley Act of 2002)
101.1	UAL United	XBRL Instance Document
101.2	UAL United	XBRL Taxonomy Extension Schema Document
101.3	UAL United	XBRL Taxonomy Extension Calculation Linkbase Document
101.4	UAL United	XBRL Taxonomy Extension Definition Linkbase Document
101.5	UAL United	XBRL Taxonomy Extension Labels Linkbase Document
101.6	UAL United	XBRL Taxonomy Extension Presentation Linkbase Document

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SIGNATURES

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

	United Continental Holdings, Inc.
	(Registrant)
Date: April 18, 2018	By:	/s/ Andrew C. Levy
		Andrew C. Levy Executive Vice President and Chief Financial Officer (Principal Financial Officer)
Date: April 18, 2018	By:	/s/ Chris Kenny
		Chris Kenny Vice President and Controller (Principal Accounting Officer)
	United Airlines, Inc.
	(Registrant)
Date: April 18, 2018	By:	/s/ Andrew C. Levy
		Andrew C. Levy Executive Vice President and Chief Financial Officer (Principal Financial Officer)
Date: April 18, 2018	By:	/s/ Chris Kenny
		Chris Kenny Vice President and Controller (Principal Accounting Officer)

36

EX-12.1

Exhibit 12.1

United Continental Holdings, Inc. and Subsidiary Companies

Computation of Ratio of Earnings to Fixed Charges

(In millions, except ratios)	Three Months Ended March 31, 2018		2017 (a)		2016 (a)		2015		2014		2013
Earnings:
Earnings before income taxes	$	184	$	3,040	$	3,773	$	4,219	$	1,128	$	539
Add (deduct):
Fixed charges, from below		349		1,417		1,430		1,428		1,648		1,629
Amortization of capitalized interest		2		9		11		12		12		11
Distributed earnings of affiliates		—		—		1		1		1		—
Interest capitalized		(19)		(84)		(72)		(49)		(52)		(49)
Equity earnings in affiliates		(5)		(4)		—		(2)		(1)		(1)
Earnings as adjusted	$	511	$	4,378	$	5,143	$	5,609	$	2,736	$	2,129
Fixed charges:
Interest expense	$	176	$	671	$	674	$	669	$	735	$	783
Portion of rent expense representative of the interest factor (b)		173		746		756		759		913		846
Fixed charges	$	349	$	1,417	$	1,430	$	1,428	$	1,648	$	1,629
Ratio of earnings to fixed charges		1.46		3.09		3.60		3.93		1.66		1.31

(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of United Continental Holdings, Inc.’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2018 for additional information related to the adjusted results.

(b) Imputed interest applied to rent expense.

EX-12.2

Exhibit 12.2

United Airlines, Inc. and Subsidiary Companies

Computation of Ratio of Earnings to Fixed Charges

(In millions, except ratios)	Three Months Ended March 31, 2018		2017 (a)		2016 (a)		2015		2014		2013
Earnings:
Earnings before income taxes	$	185	$	3,042	$	3,775	$	4,221	$	1,110	$	637
Add (deduct):
Fixed charges, from below		349		1,417		1,430		1,429		1,655		1,627
Amortization of capitalized interest		2		9		11		12		12		11
Distributed earnings of affiliates		—		—		1		1		1		—
Interest capitalized		(19)		(84)		(72)		(49)		(52)		(49)
Equity earnings in affiliates		(5)		(4)		—		(2)		(1)		(1)
Earnings as adjusted	$	512	$	4,380	$	5,145	$	5,612	$	2,725	$	2,225
Fixed charges:
Interest expense	$	176	$	671	$	674	$	670	$	742	$	781
Portion of rent expense representative of the interest factor (b)		173		746		756		759		913		846
Fixed charges	$	349	$	1,417	$	1,430	$	1,429	$	1,655	$	1,627
Ratio of earnings to fixed charges		1.47		3.09		3.60		3.93		1.65		1.37

(a) Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of United Airlines, Inc.’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2018 for additional information related to the adjusted results.

(b) Imputed interest applied to rent expense.

EX-31.1

Exhibit 31.1

Certification of the Principal Executive Officer

Pursuant to 15 U.S.C. 78m(a) or 78o(d)

(Section 302 of the Sarbanes-Oxley Act of 2002)

I, Oscar Munoz, certify that:

(1) I have reviewed this quarterly report on Form 10-Q for the quarterly period ended March 31, 2018 of United Continental Holdings, Inc. (the “Company”);

(2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

(3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Company as of, and for, the periods presented in this report;

(4) The Company’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Company and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the Company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the Company’s internal control over financial reporting that occurred during the Company’s most recent fiscal quarter (the Company’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting; and

(5) The Company’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Company’s auditors and the audit committee of the Company’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Company’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the Company’s internal control over financial reporting.

/s/ Oscar Munoz

Oscar Munoz

Chief Executive Officer

Date: April 18, 2018

EX-31.2

Exhibit 31.2

Certification of the Principal Financial Officer

Pursuant to 15 U.S.C. 78m(a) or 78o(d)

(Section 302 of the Sarbanes-Oxley Act of 2002)

I, Andrew C. Levy, certify that:

(1) I have reviewed this quarterly report on Form 10-Q for the quarterly period ended March 31, 2018 of United Continental Holdings, Inc. (the “Company”);

(2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

(3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Company as of, and for, the periods presented in this report;

(4) The Company’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Company and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the Company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the Company’s internal control over financial reporting that occurred during the Company’s most recent fiscal quarter (the Company’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting; and

(5) The Company’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Company’s auditors and the audit committee of the Company’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Company’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the Company’s internal control over financial reporting.

/s/ Andrew C. Levy

Andrew C. Levy

Executive Vice President and Chief Financial Officer

Date: April 18, 2018

EX-31.3

Exhibit 31.3

Certification of the Principal Executive Officer

Pursuant to 15 U.S.C. 78m(a) or 78o(d)

(Section 302 of the Sarbanes-Oxley Act of 2002)

I, Oscar Munoz, certify that:

(1) I have reviewed this quarterly report on Form 10-Q for the quarterly period ended March 31, 2018 of United Airlines, Inc. (the “Company”);

(2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

(3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Company as of, and for, the periods presented in this report;

(4) The Company’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Company and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the Company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the Company’s internal control over financial reporting that occurred during the Company’s most recent fiscal quarter (the Company’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting; and

(5) The Company’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Company’s auditors and the audit committee of the Company’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Company’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the Company’s internal control over financial reporting.

/s/ Oscar Munoz

Oscar Munoz

Chief Executive Officer

Date: April 18, 2018

EX-31.4

Exhibit 31.4

Certification of the Principal Financial Officer

Pursuant to 15 U.S.C. 78m(a) or 78o(d)

(Section 302 of the Sarbanes-Oxley Act of 2002)

I, Andrew C. Levy, certify that:

(1) I have reviewed this quarterly report on Form 10-Q for the quarterly period ended March 31, 2018 of United Airlines, Inc. (the “Company”);

(2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

(3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Company as of, and for, the periods presented in this report;

(4) The Company’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Company and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the Company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the Company’s internal control over financial reporting that occurred during the Company’s most recent fiscal quarter (the Company’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting; and

(5) The Company’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Company’s auditors and the audit committee of the Company’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Company’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the Company’s internal control over financial reporting.

/s/ Andrew C. Levy

Andrew C. Levy

Executive Vice President and Chief Financial Officer

Date: April 18, 2018

EX-32.1

Exhibit 32.1

Certification of United Continental Holdings, Inc.

Pursuant to 18 U.S.C. 1350

(Section 906 of the Sarbanes-Oxley Act of 2002)

Each undersigned officer certifies that to the best of his knowledge based on a review of the quarterly report on Form 10-Q for the quarterly period ended March 31, 2018 of United Continental Holdings, Inc. (the “Report”):

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of United Continental Holdings, Inc.

Date: April 18, 2018

/s/ Oscar Munoz

Oscar Munoz

Chief Executive Officer

/s/ Andrew C. Levy

Andrew C. Levy

Executive Vice President and Chief Financial Officer

EX-32.2

Exhibit 32.2

Certification of United Airlines, Inc.

Pursuant to 18 U.S.C. 1350

(Section 906 of the Sarbanes-Oxley Act of 2002)

Each undersigned officer certifies that to the best of his knowledge based on a review of the quarterly report on Form 10-Q for the quarterly period ended March 31, 2018 of United Airlines, Inc. (the “Report”):

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of United Airlines, Inc.

Date: April 18, 2018

/s/ Oscar Munoz

Oscar Munoz

Chief Executive Officer

/s/ Andrew C. Levy

Andrew C. Levy

Executive Vice President and Chief Financial Officer

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 12, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	UAL
Entity Registrant Name	United Continental Holdings, Inc.
Entity Central Index Key	0000100517
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		277,265,493
United Airlines, Inc.
Document Information [Line Items]
Entity Registrant Name	United Airlines, Inc.
Entity Central Index Key	0000319687
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		1,000

XML

Statements of Consolidated Operations - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	[1]
Operating revenue:
Passenger revenue	$ 8,149	$ 7,653
Cargo	293	238
Other operating revenue	590	535
Total operating revenue	9,032	8,426
Operating expense:
Salaries and related costs	2,726	2,636
Aircraft fuel	1,965	1,560
Regional capacity purchase	619	536
Landing fees and other rent	558	544
Depreciation and amortization	541	518
Aircraft maintenance materials and outside repairs	440	454
Distribution expenses	342	319
Aircraft rent	127	179
Special charges (Note 10)	40	51
Other operating expenses	1,398	1,309
Total operating expenses	8,756	8,106
Operating income	276	320
Nonoperating income (expense):
Interest expense	(176)	(162)
Interest capitalized	19	23
Interest income	17	11
Miscellaneous, net	48	(42)
Total nonoperating expense, net	(92)	(170)
Income before income taxes	184	150
Income tax expense	37	51
Net income	$ 147	$ 99
Earnings per share, basic and diluted	$ 0.52	$ 0.32
United Airlines, Inc.
Operating revenue:
Passenger revenue	$ 8,149	$ 7,653
Cargo	293	238
Other operating revenue	590	535
Total operating revenue	9,032	8,426
Operating expense:
Salaries and related costs	2,726	2,636
Aircraft fuel	1,965	1,560
Regional capacity purchase	619	536
Landing fees and other rent	558	544
Depreciation and amortization	541	518
Aircraft maintenance materials and outside repairs	440	454
Distribution expenses	342	319
Aircraft rent	127	179
Special charges (Note 10)	40	51
Other operating expenses	1,397	1,309
Total operating expenses	8,755	8,106
Operating income	277	320
Nonoperating income (expense):
Interest expense	(176)	(162)
Interest capitalized	19	23
Interest income	17	11
Miscellaneous, net	48	(41)
Total nonoperating expense, net	(92)	(169)
Income before income taxes	185	151
Income tax expense	38	51
Net income	$ 147	$ 100

[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

XML

Statements of Consolidated Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	[1]
Net income	$ 147	$ 99
Other comprehensive income (loss), net change related to:
Employee benefit plans, net of taxes	30	(8)
Investments and other, net of taxes	3	1
Total other comprehensive income (loss), net	33	(7)
Total comprehensive income, net	180	92
United Airlines, Inc.
Net income	147	100
Other comprehensive income (loss), net change related to:
Employee benefit plans, net of taxes	30	(8)
Investments and other, net of taxes	3	1
Total other comprehensive income (loss), net	33	(7)
Total comprehensive income, net	$ 180	$ 93

[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

XML

Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	[1]
Current assets:
Cash and cash equivalents	$ 2,404	$ 1,482
Short-term investments	2,071	2,316
Receivables, less allowance for doubtful accounts (2018 - $7; 2017 - $7)	1,760	1,340
Aircraft fuel, spare parts and supplies, less obsolescence allowance (2018 - $365; 2017 - $354)	924	924
Prepaid expenses and other	1,128	1,071
Total current assets	8,287	7,133
Operating property and equipment: Owned-
Flight equipment	29,651	28,692
Other property and equipment	7,193	6,946
Total owned property and equipment	36,844	35,638
Less - Accumulated depreciation and amortization	(11,538)	(11,159)
Total owned property and equipment, net	25,306	24,479
Purchase deposits for flight equipment	1,025	1,344
Capital leases-
Flight equipment	1,205	1,151
Other property and equipment	11	11
Total capital leases	1,216	1,162
Less - Accumulated amortization	(808)	(777)
Total capital leases, net	408	385
Total operating property and equipment, net	26,739	26,208
Other assets:
Goodwill	4,523	4,523
Intangibles, less accumulated amortization (2018 - $1,329; 2017 - $1,313)	3,521	3,539
Restricted cash	95	91
Investments in affiliates and other, net	853	852
Total other assets	8,992	9,005
Total assets	44,018	42,346
Current liabilities:
Advance ticket sales	5,501	3,940
Accounts payable	2,399	2,196
Frequent flyer deferred revenue	2,221	2,192
Accrued salaries and benefits	1,637	2,166
Current maturities of long-term debt	1,655	1,565
Current maturities of capital leases	124	128
Other	646	576
Total current liabilities	14,183	12,763
Long-term debt	12,166	11,703
Long-term obligations under capital leases	1,019	996
Other liabilities and deferred credits:
Frequent flyer deferred revenue	2,716	2,591
Postretirement benefit liability	1,593	1,602
Pension liability	1,828	1,921
Deferred income taxes	250	204
Lease fair value adjustment, net	171	198
Other	1,756	1,634
Total other liabilities and deferred credits	8,314	8,150
Commitments and contingencies
Stockholders' equity:
Preferred stock
Common stock	3	3
Additional capital invested	6,077	6,098
Retained earnings	4,684	4,549
Stock held in treasury, at cost	(1,314)	(769)
Accumulated other comprehensive loss	(1,114)	(1,147)
Total stockholders' equity	8,336	8,734
Total liabilities and stockholders' equity	44,018	42,346
United Airlines, Inc.
Current assets:
Cash and cash equivalents	2,398	1,476
Short-term investments	2,071	2,316
Receivables, less allowance for doubtful accounts (2018 - $7; 2017 - $7)	1,760	1,340
Aircraft fuel, spare parts and supplies, less obsolescence allowance (2018 - $365; 2017 - $354)	924	924
Prepaid expenses and other	1,129	1,071
Total current assets	8,282	7,127
Operating property and equipment: Owned-
Flight equipment	29,651	28,692
Other property and equipment	7,193	6,946
Total owned property and equipment	36,844	35,638
Less - Accumulated depreciation and amortization	(11,538)	(11,159)
Total owned property and equipment, net	25,306	24,479
Purchase deposits for flight equipment	1,025	1,344
Capital leases-
Flight equipment	1,205	1,151
Other property and equipment	11	11
Total capital leases	1,216	1,162
Less - Accumulated amortization	(808)	(777)
Total capital leases, net	408	385
Total operating property and equipment, net	26,739	26,208
Other assets:
Goodwill	4,523	4,523
Intangibles, less accumulated amortization (2018 - $1,329; 2017 - $1,313)	3,521	3,539
Restricted cash	95	91
Investments in affiliates and other, net	853	852
Total other assets	8,992	9,005
Total assets	44,013	42,340
Current liabilities:
Advance ticket sales	5,501	3,940
Accounts payable	2,399	2,196
Frequent flyer deferred revenue	2,221	2,192
Accrued salaries and benefits	1,637	2,166
Current maturities of long-term debt	1,655	1,565
Current maturities of capital leases	124	128
Other	652	581
Total current liabilities	14,189	12,768
Long-term debt	12,166	11,703
Long-term obligations under capital leases	1,019	996
Other liabilities and deferred credits:
Frequent flyer deferred revenue	2,716	2,591
Postretirement benefit liability	1,593	1,602
Pension liability	1,828	1,921
Deferred income taxes	277	231
Lease fair value adjustment, net	171	198
Other	1,756	1,634
Total other liabilities and deferred credits	8,341	8,177
Commitments and contingencies
Stockholders' equity:
Additional capital invested	1,233	1,787
Retained earnings	8,287	8,146
Accumulated other comprehensive loss	(1,114)	(1,147)
Receivable from related parties	(108)	(90)
Total stockholders' equity	8,298	8,696
Total liabilities and stockholders' equity	$ 44,013	$ 42,340

[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	[1]
Receivables, allowance for doubtful accounts	$ 7	$ 7
Aircraft fuel, spare parts and supplies, obsolescence allowance	365	354
Intangibles, accumulated amortization	$ 1,329	$ 1,313
Common stock, par value	$ 0.01	$ 0.01
Common shares, authorized	1,000,000,000	1,000,000,000
Common shares, outstanding	279,410,451	286,973,195
United Airlines, Inc.
Receivables, allowance for doubtful accounts	$ 7	$ 7
Aircraft fuel, spare parts and supplies, obsolescence allowance	365	354
Intangibles, accumulated amortization	$ 1,329	$ 1,313
Common stock, par value	$ 0.01	$ 0.01
Common shares, authorized	1,000	1,000
Common shares, issued	1,000	1,000
Common shares, outstanding	1,000	1,000

[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

XML

Statements of Consolidated Cash Flows - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities:
Net cash provided by operating activities		$ 1,733	$ 547
Cash Flows from Investing Activities:
Capital expenditures		(979)	(691)
Purchases of short-term and other investments		(596)	(774)
Proceeds from sale of short-term and other investments		840	810
Proceeds from sale of property and equipment		3	4
Other, net		2	8
Net cash used in investing activities		(730)	(643)
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt and airport construction financing		696	755
Repurchases of common stock		(529)	(258)
Payments of long-term debt		(189)	(315)
Principal payments under capital leases		(30)	(31)
Other, net		(32)	(65)
Net cash provided (used) in financing activities		(84)	86
Net increase (decrease) in cash, cash equivalents and restricted cash		919	(10)
Cash, cash equivalents and restricted cash at beginning of the period		1,591	2,303
Cash, cash equivalents and restricted cash at end of the period	[1]	2,510	2,293
Investing and Financing Activities Not Affecting Cash:
Property and equipment acquired through the issuance of debt and capital leases		74	711
Airport construction financing		12	21
United Airlines, Inc.
Cash Flows from Operating Activities:
Net cash provided by operating activities		1,717	535
Cash Flows from Investing Activities:
Capital expenditures		(979)	(691)
Purchases of short-term investments and other investments		(596)	(774)
Proceeds from sale of short-term and other investments		840	810
Proceeds from sale of property and equipment		3	4
Other, net		2	8
Net cash used in investing activities		(730)	(643)
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt and airport construction financing		696	755
Dividend to UAL		(529)	(258)
Payments of long-term debt		(189)	(315)
Principal payments under capital leases		(30)	(31)
Other, net		(16)	(53)
Net cash provided (used) in financing activities		(68)	98
Net increase (decrease) in cash, cash equivalents and restricted cash		919	(10)
Cash, cash equivalents and restricted cash at beginning of the period		1,585	2,297
Cash, cash equivalents and restricted cash at end of the period	[2]	2,504	2,287
Investing and Financing Activities Not Affecting Cash:
Property and equipment acquired through the issuance of debt and capital leases		74	711
Airport construction financing		$ 12	$ 21

[1] The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet: Reconciliation of cash, cash equivalents and restricted cash: Current assets: Cash and cash equivalents $ 2,404 $ 2,164 Restricted cash included in Prepaid expenses and other 11 - Other assets: Restricted cash 95 129 Total cash, cash equivalents and restricted cash $ 2,510 $ 2,293

[2] The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet: Reconciliation of cash, cash equivalents and restricted cash: Current assets: Cash and cash equivalents $ 2,398 $ 2,158 Restricted cash included in Prepaid expenses and other 11 - Other assets: Restricted cash 95 129 Total cash, cash equivalents and restricted cash $ 2,504 $ 2,287

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Statements of Consolidated Cash Flows (Parenthetical) $ in Millions	Mar. 31, 2018 USD ($)
Current assets:
Cash and cash equivalents	$ 2,404
Other assets:
Restricted cash	95
Total cash, cash equivalents and restricted cash	2,510	[1]
United Airlines, Inc.
Current assets:
Cash and cash equivalents	2,398
Other assets:
Restricted cash	95
Total cash, cash equivalents and restricted cash	2,504	[2]
Prepaid Expenses and Other
Current assets:
Restricted cash included in Prepaid expenses and other	11
Prepaid Expenses and Other | United Airlines, Inc.
Current assets:
Restricted cash included in Prepaid expenses and other	$ 11

[1] The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet: Reconciliation of cash, cash equivalents and restricted cash: Current assets: Cash and cash equivalents $ 2,404 $ 2,164 Restricted cash included in Prepaid expenses and other 11 - Other assets: Restricted cash 95 129 Total cash, cash equivalents and restricted cash $ 2,510 $ 2,293

[2] The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the consolidated balance sheet: Reconciliation of cash, cash equivalents and restricted cash: Current assets: Cash and cash equivalents $ 2,398 $ 2,158 Restricted cash included in Prepaid expenses and other 11 - Other assets: Restricted cash 95 129 Total cash, cash equivalents and restricted cash $ 2,504 $ 2,287

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Recently Issued Accounting Standards

3 Months Ended

Mar. 31, 2018

Recently Issued Accounting Standards

NOTE 1 - RECENTLY ISSUED ACCOUNTING STANDARDS

The Company adopted FASB Accounting Standards Codification Topic 606, Revenue from Contracts with Customers (the “New Revenue Standard”), effective January 1, 2018 using the full-retrospective method. Topic 606 prescribes that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. For the Company, the most significant impact of the standard is the reclassification of certain ancillary fees from other operating revenue into passenger revenue on the statement of consolidated operations. These ancillary fees are directly related to passenger travel, such as ticket change fees and baggage fees, and are no longer considered distinct performance obligations separate from the passenger travel component. In addition, the ticket change fees, which were previously recognized when received, are now recognized when transportation is provided. Adoption of the standard had no impact on the Company’s consolidated cash flows statements.

The Company adopted Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (the “New Retirement Standard”), effective January 1, 2018 using the full-retrospective method. The New Retirement Standard requires employers to present the service cost component of the net periodic benefit cost in the same income statement line item as other employee compensation costs arising from services rendered during the period. The other components of net benefit cost, including interest cost, expected return on plan assets, amortization of prior service cost/credit and actuarial gain/loss, and settlement and curtailment effects, are to be presented outside of any subtotal of operating income. The Company elected to apply the practical expedient and use the amounts disclosed in Note 5 to the financial statements included in Part I, Item 1 of the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2017 as the estimation basis for applying the retrospective presentation requirements of the standard.

The new standards had the same impact on the financial statements of United as they had on the financial statements of UAL. The table below presents the impact of the adoption of the New Revenue Standard and the New Retirement Standard on select accounts and captions of the statement of consolidated operations for the first quarter of 2017 (in millions, except per share amounts):

	Three Months Ended March 31, 2017
	As Previously Reported		New Revenue Standard Adjustments		New Retirement Standard Adjustments		As Adjusted
Passenger revenue	$	7,174	$	479	$	—	$	7,653
Cargo		220		18		—		238
Other operating revenue		1,026		(491)		—		535
Total operating revenue		8,420		6		—		8,426
Salaries and related costs		2,661		—		(25)		2,636
Distribution expenses		307		12		—		319
Other operating expenses		1,332		(23)		—		1,309
Total operating expenses		8,142		(11)		(25)		8,106
Operating income		278		17		25		320
Interest expense		(150)		(12)		—		(162)
Miscellaneous, net		(17)		—		(25)		(42)
Total nonoperating expense, net		(133)		(12)		(25)		(170)
Income before income taxes		145		5		—		150
Income tax expense		49		2		—		51
Net income		96		3		—		99
Earnings per share, basic and diluted		0.31		0.01		—		0.32

The table below presents the impact of the adoption of the New Revenue Standard on UAL’s balance sheet accounts and captions as of December 31, 2017 (in millions):

	At December 31, 2017
	As Previously Reported		New  Revenue Standard Adjustments			As Adjusted
Prepaid expenses and other	$	1,051	$	20		$	1,071
Total current assets		7,113		20			7,133
Total assets		42,326		20			42,346
Advance ticket sales		3,876		64			3,940
Frequent flyer deferred revenue		2,176		16			2,192
Other		569		7			576
Total current liabilities		12,676		87			12,763
Frequent flyer deferred revenue - long-term		2,565		26			2,591
Deferred income taxes		225		(21)			204
Total other liabilities and deferred credits		8,145		5			8,150
Retained earnings		4,621		(72	)		4,549
Total stockholders’ equity		8,806		(72)			8,734
Total liabilities and stockholders’ equity		42,326		20			42,346

The Company adopted Accounting Standards Update No. 2016-01, Financial Instruments—Overall (Subtopic 825-10) (“ASU 2016-01”) effective January 1, 2018. This standard makes several changes, including the elimination of the available-for-sale classification of equity investments, and requires equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in earnings. The adoption did not have a material impact on our financial statements. See Note 4 and 7 included in this Part I, Item 1 for additional information.

Accounting for Leases. In February 2016, the FASB amended the FASB Accounting Standards Codification and created a new Topic 842, Leases (the “New Lease Standard”). The guidance requires lessees to recognize a right-of-use asset and a lease liability for all leases (with the exception of short-term leases) at the commencement date and recognize expenses on their income statements similar to the current Topic 840, Leases. It is effective for fiscal years and interim periods beginning after December 15, 2018, and early adoption is permitted. Lessees and lessors are required to adopt the New Lease Standard using a modified retrospective approach for all leases existing at or commencing after the date of initial application with an option to use certain practical expedients. We have not completed our evaluation of the impact but believe this standard will have a significant impact on our consolidated balance sheets but is not expected to have a material impact on the Company’s results of operations or cash flows. The primary effect of adopting the new standard will be to record assets and obligations for its operating leases.

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Revenue

3 Months Ended

Mar. 31, 2018

Revenue

NOTE 2 - REVENUE

The Company presents Passenger revenue, Cargo revenue and Other operating revenue on its income statement. Passenger revenue is recognized when transportation is provided and Cargo revenue is recognized when shipments are delivered. Other operating revenue is recognized as the related performance obligations are satisfied.

The Company sells passenger ticket and related ancillary services for mainline and regional flights primarily via credit cards with payments collected by the Company in advance of the performance of related services. The Company initially records ticket sales in its Advance ticket sales liability, deferring revenue recognition until the travel occurs. For travel that has more than one flight segment, the Company deems each segment as a separate performance obligation and recognizes revenue for each segment as travel occurs. Tickets sold by other airlines where the Company provides the transportation are recognized as passenger revenue at the estimated value to be billed to the other airline when travel is provided. Differences between amounts billed and the actual amounts may be rejected and rebilled or written off if the amount recorded was different from the original estimate. When necessary, the Company records a reserve against its billings and payables with other airlines based on historical experience.

The Company sells certain tickets with connecting flights with one or more segments operated by its other airline partners. For segments operated by its other airline partners, the Company has determined that it is acting as an agent on behalf of the other airlines as they are responsible for their portion of the contract (i.e. transportation of the passenger). The Company, as the agent, recognizes revenue within Other operating revenue at the time of the travel for the net amount representing commission to be retained by the Company for any segments flown by other airlines.

Refundable tickets expire after one year from the date of issuance. Non-refundable tickets generally expire on the date of the intended travel, unless the date is extended by notification from the customer on or before the intended travel date. The Company records breakage revenue on the travel date for its estimate of tickets that will expire unused. To determine breakage, the Company uses its historical experience with refundable and non-refundable expired tickets and other facts, such as recent aging trends, program changes and modifications that could affect the ultimate expiration patterns of tickets. Fees charged in association with changes or extensions to non-refundable tickets are considered part of the Company’s passenger travel obligation. As such, those fees are deferred at the time of collection and recognized at the time the travel is provided.

United initially capitalizes the costs of selling airline travel tickets and then recognizes those costs as Distribution expense at the time of travel. Passenger ticket costs include credit card fees, travel agency and other commissions paid, as well as global distribution systems booking fees.

Ticket Taxes. Certain governmental taxes are imposed on the Company’s ticket sales through a fee included in ticket prices. The Company collects these fees and remits them to the appropriate government agency. These fees are recorded on a net basis and, as a result, are excluded from revenue.

Accounts Receivable. Accounts receivable primarily consist of amounts due from credit card companies, non-airline partners, and cargo transportation customers. We provide an allowance for uncollectible accounts equal to the estimated losses expected to be incurred based on historical write-offs and other specific analyses. Bad debt expense and write-offs were not material for the three months ended March 31, 2018 and 2017.

Advance Ticket Sales. Advance ticket sales represent the Company’s liability to provide air transportation in the future. In both the three months ended March 31, 2018 and 2017, the Company recognized approximately $1.9 billion of passenger revenue for tickets that were included in Advance ticket sales at the beginning of those periods. All tickets sold at any given point of time have travel dates extending up to twelve months. As a result, the balance of the Company’s Advance ticket sales liability represents activity that will be recognized in the next twelve months.

Frequent Flyer Accounting. United’s MileagePlus program builds customer loyalty by offering awards, benefits and services to program participants. Members in this program earn miles for travel on United, United Express, Star Alliance members and certain other airlines that participate in the program. Members can also earn miles by purchasing the goods and services of our network of non-airline partners. We have contracts to sell miles to these partners with the terms extending from one to eight years. These partners include domestic and international credit card issuers, retail merchants, hotels, car rental companies and our participating airline partners. Miles can be redeemed for free (other than taxes and government imposed fees), discounted or upgraded air travel and non-travel awards. Miles expire after 18 months of member account inactivity.

Miles Earned in Conjunction with Travel. When frequent flyers earn miles for flights, the Company recognizes a portion of the ticket sales as revenue when the travel occurs and defers a portion of the ticket sale representing the value of the related miles as a separate performance obligation. The Company determines the estimated selling price of travel and miles as if each element is sold on a separate basis. The total consideration from each ticket sale is then allocated to each of these elements, individually, on a pro rata basis. At the time of travel, the Company records the portion allocated to the miles to Frequent flyer deferred revenue on the Company’s consolidated balance sheet and subsequently recognizes it into revenue when miles are redeemed for air travel and non-travel awards.

The Company’s estimated selling price of miles is based on an equivalent ticket value less breakage, which incorporates the expected redemption of miles, as the best estimate of selling price for these miles. The equivalent ticket value is based on the prior 12 months’ weighted average equivalent ticket value of similar fares as those used to settle award redemptions while taking into consideration such factors as redemption pattern, cabin class, loyalty status and geographic region. The estimated selling price of miles is adjusted by breakage that considers a number of factors, including redemption patterns of various customer groups. The Company reviews its breakage estimates annually based upon the latest available information regarding redemption and expiration patterns. The Company’s estimate of the expected expiration of miles requires significant management judgment. Current and future changes to expiration assumptions or to the expiration policy, or to program rules and program redemption opportunities, may result in material changes to the deferred revenue balance as well as recognized revenues from the program.

Co-Brand Agreement. United has a significant contract to sell MileagePlus miles to its co-branded credit card partner Chase Bank USA, N.A. (“Chase”). Chase awards miles to MileagePlus members based on their credit card activity. United identified the following significant separately identifiable performance obligations in the co-brand agreement:

• MileagePlus miles awarded - United has a performance obligation to provide MileagePlus cardholders with miles to be used for air travel and non-travel award redemptions. The Company records Passenger revenue related to the travel awards when the transportation is provided and records Other revenue related to the non-travel awards when the goods or services are delivered. The Company records the cost associated with non-travel awards in Other operating revenue.

• Marketing - United’s performance obligation is to provide Chase access to its customer list and the use of its brand. United determined access to its customer list and use of the United brand constitute a single performance obligation by virtue of being highly interdependent and interrelated. Marketing revenue is recorded to Other operating revenue over the term of the co-brand agreement based on customer’s use of the MileagePlus credit card.

• Advertising - United has a performance obligation to provide advertising in support of the MileagePlus card in various customer contact points such as United’s website, email promotions, direct mail campaigns, airport advertising and in-flight advertising. Advertising revenue is recorded to Other operating revenue as advertising is provided.

• Other travel-related benefits - United’s performance obligations are comprised of various items such as waived bag fees, seat upgrades, and lounge passes. Lounge passes are recorded to Other operating revenue as customers use the lounge passes. Bag fees and seat upgrades are recorded to Passenger revenue at the time of the associated travel.

The fair value of the separately identifiable performance obligations is determined using management’s estimated selling price of each component. The objective of using the estimated selling price based methodology is to determine the price at which we would transact a sale if the product or service were sold on a stand-alone basis. Accordingly, we determine our best estimate of selling price by considering multiple inputs and methods including, but not limited to, discounted cash flows, brand value, volume discounts, published selling prices, number of miles awarded and number of miles redeemed. The Company estimated the selling prices and volumes over the term of the co-brand agreement in order to determine the allocation of proceeds to each of the components to be delivered. We also evaluate volumes on an annual basis, which may result in a change in the allocation of the estimated consideration from the co-brand agreement on a prospective basis.

Frequent flyer deferred revenue. Miles in MileagePlus members’ accounts are combined into one homogeneous pool and are thus not separately identifiable, for award redemption purposes, between miles earned in the current period and those in their beginning balance. The Company expects the majority of these miles to be redeemed within the first four years with the highest redemption rate in year one. The table below presents a roll forward of Frequent flyer deferred revenue (in millions):

	Three Months Ended March 31,
	2018		2017
Total Frequent flyer deferred revenue—beginning balance	$	4,783	$	4,889
Total miles awarded		603		488
Travel miles redeemed (Passenger revenue)		(409)		(398)
Non-travel miles redeemed (Other operating revenue)		(40)		(39)
Total Frequent flyer deferred revenue—ending balance	$	4,937	$	4,940

In the three months ended March 31, 2018 and 2017, the Company recognized, in Other operating revenue, $482 million and $403 million, respectively, related to the marketing, advertising and other travel-related benefits of the mileage revenue associated with our various partner agreements including, but not limited to, our Chase co-brand agreement. The portion related to the MileagePlus miles awarded of the total amounts received is deferred and presented in the table above as an increase to the frequent flyer liability. The Company also recognized, in Other operating revenue, $28 million in costs associated with the non-travel miles redeemed in the three months ended March 31, 2018 and 2017.

Passenger Revenue by Geography. The Company further disaggregates passenger revenue by geographic regions and by mainline versus regional. The following table presents passenger revenue by geographic region and by mainline versus regional for the three months ended March 31 (in millions):

	2018		2017
Mainline	$	3,485	$	3,272
Regional		1,483		1,379
Domestic		4,968		4,651
Atlantic		1,252		1,117
Pacific		1,069		1,053
Latin America		860		832
International		3,181		3,002
Consolidated	$	8,149	$	7,653
Mainline		6,616		6,227
Regional		1,533		1,426
Consolidated	$	8,149	$	7,653

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 $497 million and $478 million of ancillary fees within passenger revenue in the first three months of 2018 and 2017, respectively.

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Earnings Per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share

NOTE 3 - EARNINGS PER SHARE

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

	Three Months Ended March 31,
	2018		2017
Earnings available to common stockholders	$	147	$	99
Basic weighted-average shares outstanding		283.9		313.7
Effect of employee stock awards		1.0		0.9
Diluted weighted-average shares outstanding		284.9		314.6
Earnings per share, basic and diluted	$	0.52	$	0.32

The number of antidilutive securities excluded from the computation of diluted earnings per share amounts was not material.

In the three months ended March 31, 2018, UAL repurchased approximately 8.4 million shares of UAL common stock in open market transactions for $0.6 billion. As of March 31, 2018, the Company had approximately $2.4 billion remaining to purchase shares under its share repurchase program. UAL may repurchase shares through the open market, privately negotiated transactions, block trades or accelerated share repurchase transactions from time to time in accordance with applicable securities laws. UAL will repurchase shares of UAL common stock subject to prevailing market conditions, and may discontinue such repurchases at any time. See Part II, Item 2, Unregistered Sales of Equity Securities and Use of Proceeds of this report for additional information.

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Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2018

Accumulated Other Comprehensive Income (Loss)

NOTE 4 - 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		Income Taxes		Total
Balance at December 31, 2017	$	(1,102)	$	(6)	$	(39)	$	(1,147)
Changes in value		23		(4)		(6)		13
Amounts reclassified to earnings		16		—		(3)		13
Amounts reclassified to retained earnings (a)		—		7		—		7
Net change		39		3		(9)		33
Balance at March 31, 2018	$	(1,063)	$	(3)	$	(48)	$	(1,114)
Balance at December 31, 2016	$	(854)	$	(1)	$	26	$	(829)
Changes in value		(26)		—		10		(16)
Amounts reclassified to earnings		13		2		(6)		9
Net change		(13)		2		4		(7)
Balance at March 31, 2017	$	(867)	$	1	$	30	$	(836)

(a) This amount represents the unrealized loss on the Company’s investment in Azul, S.A. (“Azul”) which was previously classified as an available-for-sale security.

Details for AOCI Components Reclassified to Income	Three Months Ended March 31,				Affected Line Item in  the Statements of Consolidated Operations
	2018		2017
Pension and other postretirement liabilities
Amortization of unrecognized losses and prior service cost (a)	$	16	$	13		Miscellaneous, net
Investments and Other
Reclassifications of losses into earnings related to fuel derivative contracts		—		2		Aircraft fuel

(a) This AOCI component is included in the computation of net periodic pension and other postretirement costs (see Note 5 to the financial statements included in this Part I, Item 1 for additional information).

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Income Taxes

3 Months Ended

Mar. 31, 2018

Income Taxes

NOTE 5 - INCOME TAXES

The Company’s effective tax rate for the three months ended March 31, 2018 and 2017 was 20.3% and 33.6%, respectively. The effective tax rate represents a blend of federal, state and foreign taxes and included the impact of certain nondeductible items. The effective tax rate for the three months ended March 31, 2018 also reflects the reduced federal corporate income tax rate as a result of the enactment of the Tax Cuts and Jobs Act (the “Tax Act”) in December 2017 and the impact of a change in the Company’s mix of domestic and foreign earnings. We continue to analyze the different aspects of the Tax Act which could potentially affect the provisional estimates that were recorded at December 31, 2017.

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Employee Benefit Plans

3 Months Ended

Mar. 31, 2018

Employee Benefit Plans

NOTE 6 - EMPLOYEE BENEFIT PLANS

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

	Pension Benefits				Other Postretirement Benefits				Affected Line Item in the Statements of Consolidated Operations
	2018		2017		2018		2017
Service cost	$	57	$	49	$	3	$	2		Salaries and related costs
Interest cost		54		55		15		17		Miscellaneous, net
Expected return on plan assets		(73)		(60)		—		—		Miscellaneous, net
Amortization of unrecognized (gain) loss and prior service cost (credit)		33		31		(17)		(18)		Miscellaneous, net
Settlement loss		—		1		—		—		Miscellaneous, net
Total	$	71	$	76	$	1	$	1

During the three months ended March 31, 2018, the Company contributed $113 million to its U.S. domestic tax-qualified defined benefit pension plans.

Share-Based Compensation. In the three months ended March 31, 2018, UAL granted share-based compensation awards pursuant to the United Continental Holdings, Inc. 2017 Incentive Compensation Plan. These share-based compensation awards include 1.7 million RSUs consisting of 1.0 million time-vested RSUs and 0.7 million performance-based RSUs. The time-vested RSUs vest pro-rata, on February 28th of each year, over a three-year period from the date of grant. These 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 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, 2020. If this performance condition is achieved, cash payments will be made after the end of the performance period based on the 20-day average closing price of UAL common stock immediately prior to the vesting date. The Company accounts for the performance-based RSUs as liability awards.

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

	Three Months Ended March 31,
	2018		2017
Share-based compensation expense	$	17	$	23
	March 31, 2018		December 31, 2017
Unrecognized share-based compensation	$	102	$	53

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Financial Instruments and Fair Value Measurements

3 Months Ended

Mar. 31, 2018

Financial Instruments and Fair Value Measurements

NOTE 7 - FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS

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

	March 31, 2018								December 31, 2017
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Cash and cash equivalents	$	2,404	$	2,404	$	—	$	—	$	1,482	$	1,482	$	—	$	—
Short-term investments:
Corporate debt		945		—		945		—		958		—		958		—
Asset-backed securities		606		—		606		—		753		—		753		—
U.S. government and agency notes		110		—		110		—		113		—		113		—
Certificates of deposit placed through an account registry service (“CDARS”)		53		—		53		—		120		—		120		—
Other fixed-income securities		172		—		172		—		188		—		188		—
Other investments measured at net asset value (“NAV”)		185		—		—		—		184		—		—		—
Restricted cash		106		106		—		—		109		109		—		—
Long-term investments:
Equity securities		144		144		—		—		99		99		—		—
Enhanced equipment trust certificates (“EETC”)		19		—		—		19		22		—		—		22

Available-for-sale investment maturities - The short-term investments shown in the table above are classified as available-for-sale, with the exception of investments measured at NAV. As of March 31, 2018, asset-backed securities have remaining maturities of less than one year to approximately 17 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 other securities have maturities of less than one year to approximately three years. The EETC securities mature in 2019.

Restricted cash - Restricted cash primarily includes collateral for letters of credit and collateral associated with obligations for facility leases and workers’ compensation.

Equity securities - Equity securities represent United’s investment in Azul. The Company recognizes changes in Azul’s fair market value in Miscellaneous, net in its 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):

	Fair Value of Debt by Fair Value Hierarchy Level
	March 31, 2018										December 31, 2017
	Carrying Amount		Fair Value								Carrying Amount		Fair Value
			Total		Level 1		Level 2		Level 3				Total		Level 1		Level 2		Level 3
Long-term debt	$	13,821	$	14,068	$	—	$	10,377	$	3,691	$	13,268	$	13,787	$	—	$	10,115	$	3,672

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.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies

NOTE 8 - COMMITMENTS AND CONTINGENCIES

Commitments. As of March 31, 2018, United had firm commitments and options to purchase aircraft from The Boeing Company (“Boeing”) and Airbus S.A.S. (“Airbus”) presented in the table below:

Aircraft Type	Number of Firm       Commitments (a)
Airbus A350		45
Boeing 737 MAX		161
Boeing 777-300ER		2
Boeing 787		14
(a) United also has options and purchase rights for additional aircraft.

The aircraft listed in the table above are scheduled for delivery through 2027. To the extent the Company and the aircraft manufacturers with whom the Company has existing orders for new aircraft agree to modify the contracts governing those orders, the amount and timing of the Company’s future capital commitments could change. For the remainder of 2018, United expects to take delivery of two Boeing 777-300ER aircraft, three Boeing 787 aircraft, 10 Boeing 737 MAX aircraft and three used Boeing 767-300ER aircraft. In March 2018, United entered into an agreement to purchase 20 used Airbus A319 aircraft with expected delivery dates scheduled in 2020 and 2021.

The table below summarizes United’s commitments as of March 31, 2018, which primarily relate to the acquisition of aircraft and related spare engines, aircraft improvements and include other capital purchase commitments. Any new firm aircraft orders, including through the exercise of purchase options and purchase rights, will increase the total future capital commitments of the Company.

	(in billions)
Last nine months of 2018	$	2.4
2019		3.7
2020		2.0
2021		2.7
2022		1.8
After 2022		9.8
	$	22.4

Facility and Other Operating Leases. In March 2018, United executed a new Airline Use and Lease Agreement at O’Hare International Airport with the City of Chicago with a lease term of approximately 15 years effective May 12, 2018 through December 31, 2033.

The table below summarizes the Company’s scheduled future minimum lease payments under facility operating leases having initial or remaining noncancelable lease terms of more than one year as of March 31, 2018 (in millions):

	Facility and Other Operating Leases
Last nine months of 2018	$	1,010
2019		1,209
2020		1,302
2021		1,068
2022		930
After 2022		7,576
	$	13,095

Guarantees. As of March 31, 2018, United is the guarantor of approximately $2.0 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 approximately $1.4 billion of these obligations are accounted for as operating leases with the associated expense recorded on a straight-line basis resulting in ratable accrual of the lease obligation over the expected lease term. The leasing arrangements associated with approximately $454 million of these obligations are accounted for as capital leases. All of these bonds are due between 2019 and 2038.

Increased Cost Provisions. In the Company’s financing transactions that include loans, the Company typically agrees to reimburse lenders for any reduced returns with respect to the loans due to any change in capital requirements and, in the case of loans in which the interest rate is based on the London Interbank Offered Rate, for certain other increased costs that the lenders incur in carrying these loans as a result of any change in law, subject, in most cases, to obligations of the lenders to take certain limited steps to mitigate the requirement for, or the amount of, such increased costs. At March 31, 2018, the Company had $3.4 billion of floating rate debt and $52 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 $3.3 billion, the Company bears the risk of any change in tax laws that would subject loan or lease payments thereunder to non-U.S. entities to withholding taxes, subject to customary exclusions.

As of March 31, 2018, United is the guarantor of $154 million of aircraft mortgage debt issued by one of United’s regional carriers. The aircraft mortgage debt is subject to similar increased cost provisions as described above for the Company’s debt, and the Company would potentially be responsible for those costs under the guarantees.

Labor Negotiations. As of March 31, 2018, United had approximately 90,800 employees, of whom approximately 79% were represented by various U.S. labor organizations. UNITE HERE is attempting to organize United’s Catering Operations employees, who are currently unrepresented, and filed an application to do so with the National Mediation Board on January 24, 2018.

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Debt

3 Months Ended

Mar. 31, 2018

Debt

NOTE 9 - DEBT

As of March 31, 2018, a substantial portion of the Company’s assets, principally aircraft, route authorities, airport slots and loyalty program intangible assets, was pledged under various loan and other agreements. As of March 31, 2018, UAL and United were in compliance with their respective debt covenants. As of March 31, 2018, United had its entire capacity of $2.0 billion available under the revolving credit facility of the Company’s Amended and Restated Credit and Guaranty Agreement (as amended, the “2017 Credit Agreement”).

EETCs. In February 2018, United created two new EETC pass-through trusts, each of which issued pass-through certificates. The proceeds of the issuance of the pass-through certificates are used to purchase equipment notes issued by United and secured by its aircraft. The Company records the debt obligation upon issuance of the equipment notes rather than upon the initial issuance of the pass-through certificates. The pass-through certificates represent fractional undivided interests in the respective pass-through trusts and are not obligations of United. The payment obligations under the equipment notes are those of United. Proceeds received from the sale of pass-through certificates are initially held by a depositary in escrow for the benefit of the certificate holders until United issues equipment notes to the trust, which purchases such notes with a portion of the escrowed funds. These escrowed funds are not guaranteed by United and are not reported as debt on our consolidated balance sheet because the proceeds held by the depositary are not United’s assets. Certain details of the pass-through trusts with proceeds received from issuance of debt in 2018 are as follows (in millions, except stated interest rate):

EETC Date	Class	Principal		Final expected distribution date	Stated interest rate		Total proceeds  received from issuance of debt during 2018 and recorded as debt as of March 31, 2018		Remaining proceeds  from issuance of debt to be received in future periods
February 2018	AA	$	677	March 2030		3.50%	$	476	$	201
February 2018	A		258	March 2030		3.70%		181		77
		$	935				$	657	$	278

The table below presents the Company’s contractual principal payments (not including debt discount or debt issuance costs) at March 31, 2018 under then-outstanding long-term debt agreements (in millions):

Last nine months of 2018	$	1,380
2019		1,218
2020		1,207
2021		1,194
2022		1,529
After 2022		7,457
	$	13,985

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Special Charges

3 Months Ended

Mar. 31, 2018

Special Charges

NOTE 10 - SPECIAL CHARGES

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

	Three Months Ended March 31,
Operating:	2018		2017
Severance and benefit costs	$	14	$	37
Impairment of assets		23		—
(Gains) losses on sale of assets and other special charges		3		14
Special charges		40		51
Income tax benefit related to special charges		(9)		(18)
Total special charges, net of tax	$	31	$	33

During the three months ended March 31, 2018 and 2017, the Company recorded severance and benefit costs related to a voluntary early-out program for its technicians and related employees represented by the International Brotherhood of Teamsters (the “IBT”) of $8 million ($7 million net of taxes) and $21 million ($14 million net of taxes) respectively. In the first quarter of 2017, approximately 1,000 technicians and related employees elected to voluntarily separate from the Company and will receive a severance payment, with a maximum value of $100,000 per participant, based on years of service, with retirement dates through early 2019. Also during the three months ended March 31, 2018 and 2017, the Company recorded severance primarily related to its management reorganization initiative of $6 million ($4 million net of taxes) and $16 million ($10 million net of taxes) respectively.

During the three months ended March 31, 2018, the Company recorded a $23 million ($17 million net of taxes) fair value adjustment for aircraft purchased off lease and impairments related to certain fleet types and certain international slots no longer in use.

Accrual Activity

The severance-related accrual as of March 31, 2018 is primarily related to severance and other compensation expense associated with voluntary employee early retirement programs and is expected to be mostly paid through early 2019. The accrual balance for future lease payments on permanently grounded aircraft as of March 31, 2018 is expected to be mostly paid through 2025. Activity related to these accruals is as follows (in millions):

	Severance and Benefits		Permanently Grounded Aircraft
Balance at December 31, 2017	$	37	$	22
Accrual		14		—
Payments		(19)		(1)
Balance at March 31, 2018	$	32	$	21
	Severance and Benefits		Permanently Grounded Aircraft
Balance at December 31, 2016	$	14	$	41
Accrual		37		—
Payments		(23)		(1)
Balance at March 31, 2017	$	28	$	40

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Recently Issued Accounting Standards (Tables)

3 Months Ended

Mar. 31, 2018

ASC 606

Schedule of Adoption of Accounting Standards and Expected Impact on Financial Statements

The table below presents the impact of the adoption of the New Revenue Standard and the New Retirement Standard on select accounts and captions of the statement of consolidated operations for the first quarter of 2017 (in millions, except per share amounts):

	Three Months Ended March 31, 2017
	As Previously Reported		New Revenue Standard Adjustments		New Retirement Standard Adjustments		As Adjusted
Passenger revenue	$	7,174	$	479	$	—	$	7,653
Cargo		220		18		—		238
Other operating revenue		1,026		(491)		—		535
Total operating revenue		8,420		6		—		8,426
Salaries and related costs		2,661		—		(25)		2,636
Distribution expenses		307		12		—		319
Other operating expenses		1,332		(23)		—		1,309
Total operating expenses		8,142		(11)		(25)		8,106
Operating income		278		17		25		320
Interest expense		(150)		(12)		—		(162)
Miscellaneous, net		(17)		—		(25)		(42)
Total nonoperating expense, net		(133)		(12)		(25)		(170)
Income before income taxes		145		5		—		150
Income tax expense		49		2		—		51
Net income		96		3		—		99
Earnings per share, basic and diluted		0.31		0.01		—		0.32

The table below presents the impact of the adoption of the New Revenue Standard on UAL’s balance sheet accounts and captions as of December 31, 2017 (in millions):

	At December 31, 2017
	As Previously Reported		New  Revenue Standard Adjustments			As Adjusted
Prepaid expenses and other	$	1,051	$	20		$	1,071
Total current assets		7,113		20			7,133
Total assets		42,326		20			42,346
Advance ticket sales		3,876		64			3,940
Frequent flyer deferred revenue		2,176		16			2,192
Other		569		7			576
Total current liabilities		12,676		87			12,763
Frequent flyer deferred revenue - long-term		2,565		26			2,591
Deferred income taxes		225		(21)			204
Total other liabilities and deferred credits		8,145		5			8,150
Retained earnings		4,621		(72	)		4,549
Total stockholders’ equity		8,806		(72)			8,734
Total liabilities and stockholders’ equity		42,326		20			42,346

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Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Summary of Roll Forward of Frequent Flyer Deferred Revenue

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

	Three Months Ended March 31,
	2018		2017
Total Frequent flyer deferred revenue—beginning balance	$	4,783	$	4,889
Total miles awarded		603		488
Travel miles redeemed (Passenger revenue)		(409)		(398)
Non-travel miles redeemed (Other operating revenue)		(40)		(39)
Total Frequent flyer deferred revenue—ending balance	$	4,937	$	4,940

Summary of Passenger Revenue by Geographic Region and by Mainline Versus Regional

The following table presents passenger revenue by geographic region and by mainline versus regional for the three months ended March 31 (in millions):

	2018		2017
Mainline	$	3,485	$	3,272
Regional		1,483		1,379
Domestic		4,968		4,651
Atlantic		1,252		1,117
Pacific		1,069		1,053
Latin America		860		832
International		3,181		3,002
Consolidated	$	8,149	$	7,653
Mainline		6,616		6,227
Regional		1,533		1,426
Consolidated	$	8,149	$	7,653

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Computation of Earnings Per Share

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

	Three Months Ended March 31,
	2018		2017
Earnings available to common stockholders	$	147	$	99
Basic weighted-average shares outstanding		283.9		313.7
Effect of employee stock awards		1.0		0.9
Diluted weighted-average shares outstanding		284.9		314.6
Earnings per share, basic and diluted	$	0.52	$	0.32

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Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2018

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		Income Taxes		Total
Balance at December 31, 2017	$	(1,102)	$	(6)	$	(39)	$	(1,147)
Changes in value		23		(4)		(6)		13
Amounts reclassified to earnings		16		—		(3)		13
Amounts reclassified to retained earnings (a)		—		7		—		7
Net change		39		3		(9)		33
Balance at March 31, 2018	$	(1,063)	$	(3)	$	(48)	$	(1,114)
Balance at December 31, 2016	$	(854)	$	(1)	$	26	$	(829)
Changes in value		(26)		—		10		(16)
Amounts reclassified to earnings		13		2		(6)		9
Net change		(13)		2		4		(7)
Balance at March 31, 2017	$	(867)	$	1	$	30	$	(836)

(a) This amount represents the unrealized loss on the Company’s investment in Azul, S.A. (“Azul”) which was previously classified as an available-for-sale security.

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Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2018

Components of Net Periodic Benefit Cost

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

	Pension Benefits				Other Postretirement Benefits				Affected Line Item in the Statements of Consolidated Operations
	2018		2017		2018		2017
Service cost	$	57	$	49	$	3	$	2		Salaries and related costs
Interest cost		54		55		15		17		Miscellaneous, net
Expected return on plan assets		(73)		(60)		—		—		Miscellaneous, net
Amortization of unrecognized (gain) loss and prior service cost (credit)		33		31		(17)		(18)		Miscellaneous, net
Settlement loss		—		1		—		—		Miscellaneous, net
Total	$	71	$	76	$	1	$	1

Share-Based Compensation Expense

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

	Three Months Ended March 31,
	2018		2017
Share-based compensation expense	$	17	$	23
	March 31, 2018		December 31, 2017
Unrecognized share-based compensation	$	102	$	53

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Financial Instruments and Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2018

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

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

	March 31, 2018								December 31, 2017
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Cash and cash equivalents	$	2,404	$	2,404	$	—	$	—	$	1,482	$	1,482	$	—	$	—
Short-term investments:
Corporate debt		945		—		945		—		958		—		958		—
Asset-backed securities		606		—		606		—		753		—		753		—
U.S. government and agency notes		110		—		110		—		113		—		113		—
Certificates of deposit placed through an account registry service (“CDARS”)		53		—		53		—		120		—		120		—
Other fixed-income securities		172		—		172		—		188		—		188		—
Other investments measured at net asset value (“NAV”)		185		—		—		—		184		—		—		—
Restricted cash		106		106		—		—		109		109		—		—
Long-term investments:
Equity securities		144		144		—		—		99		99		—		—
Enhanced equipment trust certificates (“EETC”)		19		—		—		19		22		—		—		22

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):

	Fair Value of Debt by Fair Value Hierarchy Level
	March 31, 2018										December 31, 2017
	Carrying Amount		Fair Value								Carrying Amount		Fair Value
			Total		Level 1		Level 2		Level 3				Total		Level 1		Level 2		Level 3
Long-term debt	$	13,821	$	14,068	$	—	$	10,377	$	3,691	$	13,268	$	13,787	$	—	$	10,115	$	3,672

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Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2018

Schedule of Commitments to Purchase Aircrafts

As of March 31, 2018, United had firm commitments and options to purchase aircraft from The Boeing Company (“Boeing”) and Airbus S.A.S. (“Airbus”) presented in the table below:

Aircraft Type	Number of Firm       Commitments (a)
Airbus A350		45
Boeing 737 MAX		161
Boeing 777-300ER		2
Boeing 787		14
(a) United also has options and purchase rights for additional aircraft.

Future Minimum Lease Payments for Operating Leases

The table below summarizes the Company’s scheduled future minimum lease payments under facility operating leases having initial or remaining noncancelable lease terms of more than one year as of March 31, 2018 (in millions):

	Facility and Other Operating Leases
Last nine months of 2018	$	1,010
2019		1,209
2020		1,302
2021		1,068
2022		930
After 2022		7,576
	$	13,095

Aircraft Type

Schedule of Commitments to Purchase Aircrafts

The table below summarizes United’s commitments as of March 31, 2018, which primarily relate to the acquisition of aircraft and related spare engines, aircraft improvements and include other capital purchase commitments. Any new firm aircraft orders, including through the exercise of purchase options and purchase rights, will increase the total future capital commitments of the Company.

	(in billions)
Last nine months of 2018	$	2.4
2019		3.7
2020		2.0
2021		2.7
2022		1.8
After 2022		9.8
	$	22.4

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Debt (Tables)

3 Months Ended

Mar. 31, 2018

Details of Pass Through Trusts

Certain details of the pass-through trusts with proceeds received from issuance of debt in 2018 are as follows (in millions, except stated interest rate):

EETC Date	Class	Principal		Final expected distribution date	Stated interest rate		Total proceeds  received from issuance of debt during 2018 and recorded as debt as of March 31, 2018		Remaining proceeds  from issuance of debt to be received in future periods
February 2018	AA	$	677	March 2030		3.50%	$	476	$	201
February 2018	A		258	March 2030		3.70%		181		77
		$	935				$	657	$	278

Contractual Principal Payments

The table below presents the Company’s contractual principal payments (not including debt discount or debt issuance costs) at March 31, 2018 under then-outstanding long-term debt agreements (in millions):

Last nine months of 2018	$	1,380
2019		1,218
2020		1,207
2021		1,194
2022		1,529
After 2022		7,457
	$	13,985

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Special Charges (Tables)

3 Months Ended

Mar. 31, 2018

Components of Special charges

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

	Three Months Ended March 31,
Operating:	2018		2017
Severance and benefit costs	$	14	$	37
Impairment of assets		23		—
(Gains) losses on sale of assets and other special charges		3		14
Special charges		40		51
Income tax benefit related to special charges		(9)		(18)
Total special charges, net of tax	$	31	$	33

Accrual Activity

Activity related to these accruals is as follows (in millions):

	Severance and Benefits		Permanently Grounded Aircraft
Balance at December 31, 2017	$	37	$	22
Accrual		14		—
Payments		(19)		(1)
Balance at March 31, 2018	$	32	$	21
	Severance and Benefits		Permanently Grounded Aircraft
Balance at December 31, 2016	$	14	$	41
Accrual		37		—
Payments		(23)		(1)
Balance at March 31, 2017	$	28	$	40

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Schedule of Adoption of ASC 606 and Expected Impact - Statements of Consolidated Operations (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Passenger revenue	$ 8,149	$ 7,653	[1]
Cargo	293	238	[1]
Other operating revenue	590	535	[1]
Total operating revenue	9,032	8,426	[1]
Salaries and related costs	2,726	2,636	[1]
Distribution expenses	342	319	[1]
Other operating expenses	1,398	1,309	[1]
Total operating expenses	8,756	8,106	[1]
Operating income	276	320	[1]
Interest expense	(176)	(162)	[1]
Miscellaneous, net	48	(42)	[1]
Total nonoperating expense, net	(92)	(170)	[1]
Income before income taxes	184	150	[1]
Income tax expense	37	51	[1]
Net income	$ 147	$ 99	[1]
Earnings per share, basic and diluted	$ 0.52	$ 0.32	[1]
ASC 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Passenger revenue		$ 7,653
Cargo		238
Other operating revenue		535
Total operating revenue		8,426
Salaries and related costs		2,636
Distribution expenses		319
Other operating expenses		1,309
Total operating expenses		8,106
Operating income		320
Interest expense		(162)
Miscellaneous, net		(42)
Total nonoperating expense, net		(170)
Income before income taxes		150
Income tax expense		51
Net income		$ 99
Earnings per share, basic and diluted		$ 0.32
Scenario, Previously Reported | ASC 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Passenger revenue		$ 7,174
Cargo		220
Other operating revenue		1,026
Total operating revenue		8,420
Salaries and related costs		2,661
Distribution expenses		307
Other operating expenses		1,332
Total operating expenses		8,142
Operating income		278
Interest expense		(150)
Miscellaneous, net		(17)
Total nonoperating expense, net		(133)
Income before income taxes		145
Income tax expense		49
Net income		$ 96
Earnings per share, basic and diluted		$ 0.31
Adjustment | ASC 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Passenger revenue		$ 479
Cargo		18
Other operating revenue		(491)
Total operating revenue		6
Distribution expenses		12
Other operating expenses		(23)
Total operating expenses		(11)
Operating income		17
Interest expense		(12)
Total nonoperating expense, net		(12)
Income before income taxes		5
Income tax expense		2
Net income		$ 3
Earnings per share, basic and diluted		$ 0.01
New Retirement Standard Adjustments | ASC 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Salaries and related costs		$ (25)
Total operating expenses		(25)
Operating income		25
Miscellaneous, net		(25)
Total nonoperating expense, net		$ (25)

[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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Schedule of Adoption of ASC 606 and Expected Impact - Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Item Effected [Line Items]
Prepaid expenses and other	$ 1,128	$ 1,071	[1]
Total current assets	8,287	7,133	[1]
Total assets	44,018	42,346	[1]
Advance ticket sales	5,501	3,940	[1]
Frequent flyer deferred revenue	2,221	2,192	[1]
Other	646	576	[1]
Total current liabilities	14,183	12,763	[1]
Frequent flyer deferred revenue - long-term	2,716	2,591	[1]
Deferred income taxes	250	204	[1]
Total other liabilities and deferred credits	8,314	8,150	[1]
Retained earnings	4,684	4,549	[1]
Total stockholders' equity	8,336	8,734	[1]
Total liabilities and stockholders' equity	$ 44,018	42,346	[1]
ASC 606
Item Effected [Line Items]
Prepaid expenses and other		1,071
Total current assets		7,133
Total assets		42,346
Advance ticket sales		3,940
Frequent flyer deferred revenue		2,192
Other		576
Total current liabilities		12,763
Frequent flyer deferred revenue - long-term		2,591
Deferred income taxes		204
Total other liabilities and deferred credits		8,150
Retained earnings		4,549
Total stockholders' equity		8,734
Total liabilities and stockholders' equity		42,346
Scenario, Previously Reported | ASC 606
Item Effected [Line Items]
Prepaid expenses and other		1,051
Total current assets		7,113
Total assets		42,326
Advance ticket sales		3,876
Frequent flyer deferred revenue		2,176
Other		569
Total current liabilities		12,676
Frequent flyer deferred revenue - long-term		2,565
Deferred income taxes		225
Total other liabilities and deferred credits		8,145
Retained earnings		4,621
Total stockholders' equity		8,806
Total liabilities and stockholders' equity		42,326
Adjustment | ASC 606
Item Effected [Line Items]
Prepaid expenses and other		20
Total current assets		20
Total assets		20
Advance ticket sales		64
Frequent flyer deferred revenue		16
Other		7
Total current liabilities		87
Frequent flyer deferred revenue - long-term		26
Deferred income taxes		(21)
Total other liabilities and deferred credits		5
Retained earnings		(72)
Total stockholders' equity		(72)
Total liabilities and stockholders' equity		$ 20

[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Deferred Revenue Arrangement [Line Items]
Passenger revenue	$ 8,149	$ 7,653	[1]
Frequent flyer mileage program expiration period after member account inactivity	18 months
Frequent flyer mileage program period in which miles redeemed	4 years
Other operating revenue	$ 590	535	[1]
Costs associated with non-travel miles redeemed	28	28
Chase and Other Partner Agreements
Deferred Revenue Arrangement [Line Items]
Other operating revenue	482	403
Deferred Revenue for Miles in Loyalty Program
Deferred Revenue Arrangement [Line Items]
Passenger revenue	$ 1,900	1,900
Minimum
Deferred Revenue Arrangement [Line Items]
Frequent flyer mileage program expiration period	1 year
Maximum
Deferred Revenue Arrangement [Line Items]
Frequent flyer mileage program expiration period	8 years
Passenger Revenue
Deferred Revenue Arrangement [Line Items]
Ancillary fees	$ 497	$ 478

[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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Summary of Roll Forward of Frequent Flyer Deferred Revenue (Detail) - Deferred Revenue for Miles in Loyalty Program - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Deferred Revenue Arrangement [Line Items]
Total Frequent flyer deferred revenue-beginning balance	$ 4,783	$ 4,889
Total miles awarded	603	488
Travel miles redeemed (Passenger revenue)	(409)	(398)
Non-travel miles redeemed (Other operating revenue)	(40)	(39)
Total Frequent flyer deferred revenue-ending balance	$ 4,937	$ 4,940

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Summary of Passenger Revenue by Geographic Region and by Mainline Versus Regional (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Deferred Revenue Arrangement [Line Items]
Passenger-Mainline	$ 6,616	$ 6,227
Passenger-Regional	1,533	1,426
Total passenger revenue	8,149	7,653	[1]
International
Deferred Revenue Arrangement [Line Items]
Total passenger revenue	3,181	3,002
Domestic
Deferred Revenue Arrangement [Line Items]
Passenger-Mainline	3,485	3,272
Passenger-Regional	1,483	1,379
Total passenger revenue	4,968	4,651
Atlantic | International
Deferred Revenue Arrangement [Line Items]
Total passenger revenue	1,252	1,117
Pacific | International
Deferred Revenue Arrangement [Line Items]
Total passenger revenue	1,069	1,053
Latin America | International
Deferred Revenue Arrangement [Line Items]
Total passenger revenue	$ 860	$ 832

[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Computation of Earnings Per Share [Line Items]
Earnings available to common stockholders	$ 147	$ 99
Basic weighted-average shares outstanding	283.9	313.7
Effect of employee stock awards	1.0	0.9
Diluted weighted-average shares outstanding	284.9	314.6
Earnings per share, basic and diluted	$ 0.52	$ 0.32	[1]

[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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Earnings Per Share - Additional Information (Detail) shares in Millions, $ in Billions	3 Months Ended
	Mar. 31, 2018 USD ($) shares
Earnings Loss Per Share [Line Items]
Amount remaining under repurchase programs	$ 2.4
Open Market Repurchase Program
Earnings Loss Per Share [Line Items]
Number of shares repurchased | shares	8.4
Repurchases of common stock	$ 0.6

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Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, income taxes		$ (39)	$ 26
Changes in value, income taxes		(6)	10
Amounts reclassified to earnings, income taxes		(3)	(6)
Amounts reclassified to retained earnings, income taxes	[1]	0
Net change, income taxes		(9)	4
Ending Balance, income taxes		(48)	30
Beginning Balance, net of tax	[2]	8,734
Changes in value, net of tax		13	(16)
Amounts reclassified to earnings, net of tax		13
Amounts reclassified to retained earnings, net of tax	[1]	7
Total other comprehensive income (loss), net		33	(7)	[3]
Ending Balance, net of tax		8,336
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, net of tax		(1,147)	(829)
Amounts reclassified to earnings, net of tax			9
Ending Balance, net of tax		(1,114)	(836)
Pension and Other Postretirement Liabilities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, before tax		(1,102)	(854)
Changes in value, before tax		23	(26)
Amounts reclassified to earnings, before tax		16	13
Net change, before tax		39	(13)
Ending Balance, before tax		(1,063)	(867)
Investments and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance, before tax		(6)	(1)
Changes in value, before tax		(4)
Amounts reclassified to earnings, before tax			2
Amounts reclassified to retained earnings, before tax	[1]	7
Net change, before tax		3	2
Ending Balance, before tax		$ (3)	$ 1

[1] This amount represents the unrealized loss on the Company's investment in Azul, S.A. ("Azul") which was previously classified as an available-for-sale security.

[2] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). 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. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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Details about Accumulated Other Comprehensive Income Components (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Miscellaneous, Net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of unrecognized losses and prior service cost	[1]	$ 16	$ 13
Fuel Oil Contract | Aircraft Fuel
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications of losses into earnings related to fuel derivative contracts			$ 2

[1] This AOCI component is included in the computation of net periodic pension and other postretirement costs (see Note 5 to the financial statements included in this Part I, Item 1 for additional information).

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Income Taxes - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Taxes [Line Items]
Effective income tax rate	20.30%	33.60%

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Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 57	$ 49
Interest cost	54	55
Expected return on plan assets	(73)	(60)
Amortization of unrecognized (gain) loss and prior service cost (credit)	33	31
Settlement loss		1
Total	71	76
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	2
Interest cost	15	17
Amortization of unrecognized (gain) loss and prior service cost (credit)	(17)	(18)
Total	$ 1	$ 1

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Employee Benefit Plans - Additional Information (Detail) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) shares
Pension Benefits
Compensation and Retirement Disclosure [Abstract]
Employer contribution to tax-qualified defined benefit pension plans | $	$ 113
RSUs
Compensation and Retirement Disclosure [Abstract]
Share-based compensation, option awards granted	1.7
Share-based compensation, vesting period	3 years
Performance Shares
Compensation and Retirement Disclosure [Abstract]
Share-based compensation, vesting period	3 years
Share-Based Compensation, vesting date	Dec. 31, 2020
Number of days used to compute performance period average closing price of restricted stock units	20 days
Time Vested Restricted Stock Units RSU
Compensation and Retirement Disclosure [Abstract]
Share-based compensation, other than options, awards granted	1.0
Performance Based Restricted Stock Units RSU
Compensation and Retirement Disclosure [Abstract]
Share-based compensation, other than options, awards granted	0.7

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Share-Based Compensation Expense (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense	$ 17	$ 23
Unrecognized share-based compensation	$ 102	$ 53

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Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 2,404	$ 1,482
Restricted cash	106	109
Equity securities	144	99
Enhanced equipment trust certificates ("EETC")	19	22
Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	945	958
Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	606	753
U.S. Government and Agency Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	110	113
CDARS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	53	120
Other Fixed Income Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	172	188
Other Investments Measured At NAV
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	185	184
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	2,404	1,482
Restricted cash	106	109
Equity securities	144	99
Level 2 | Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	945	958
Level 2 | Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	606	753
Level 2 | U.S. Government and Agency Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	110	113
Level 2 | CDARS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	53	120
Level 2 | Other Fixed Income Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	172	188
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Enhanced equipment trust certificates ("EETC")	$ 19	$ 22

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Financial Instruments and Fair Value Measurements - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018
EETC
Fair Value [Line Items]
Available-for-sale securities remaining maturities	2019
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	17 years
Corporate Debt | Minimum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	1 year
Corporate Debt | Maximum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	3 years
CDARS | Maximum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	1 year
U.S. Government and Other Securities | Minimum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	1 year
U.S. Government and Other Securities | Maximum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	3 years

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Carrying Values and Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Carrying (Reported) Amount, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 13,821	$ 13,268
Estimate of Fair Value, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt fair value	14,068	13,787
Estimate of Fair Value, Fair Value Disclosure | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt fair value	10,377	10,115
Estimate of Fair Value, Fair Value Disclosure | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt fair value	$ 3,691	$ 3,672

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Schedule of Commitments to Purchase Aircrafts (Detail) - United Airlines, Inc. - Capital Addition Purchase Commitments	Mar. 31, 2018 Aircraft	[1]
Airbus A350 Aircraft
Long-term Purchase Commitment [Line Items]
Number of new aircraft committed to purchase	45
Boeing 737 MAX Aircraft
Long-term Purchase Commitment [Line Items]
Number of new aircraft committed to purchase	161
Boeing 777-300ER Aircraft
Long-term Purchase Commitment [Line Items]
Number of new aircraft committed to purchase	2
Boeing 787 Aircraft
Long-term Purchase Commitment [Line Items]
Number of new aircraft committed to purchase	14

[1] United also has options and purchase rights for additional aircraft.

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Commitments and Contingencies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018 USD ($) Aircraft
Tax-exempt special facilities revenue bonds
Commitments and Contingencies [Line Items]
Guarantor obligations, maximum exposure	$ 2,000,000,000
Operating leases obligations	1,400,000,000
Capital leases obligations	454,000,000
Floating Rate Debt
Commitments and Contingencies [Line Items]
Debt instrument principal amount	3,400,000,000
Fixed Rate Debt
Commitments and Contingencies [Line Items]
Debt instrument principal amount	52,000,000
Loans And Leases From Non U S Entities
Commitments and Contingencies [Line Items]
Aggregate balance	3,300,000,000
Aircraft Mortgage Debt
Commitments and Contingencies [Line Items]
Guarantor obligations, maximum exposure	154,000,000
Facility and Other Operating Leases
Commitments and Contingencies [Line Items]
Operating leases obligations	$ 13,095,000,000
Maximum
Commitments and Contingencies [Line Items]
Debt instrument, remaining terms (years)	11 years
Maximum | Tax-exempt special facilities revenue bonds
Commitments and Contingencies [Line Items]
Debt instrument maturity year	2038
Maximum | Loans And Leases From Non U S Entities
Commitments and Contingencies [Line Items]
Debt instrument, remaining terms (years)	11 years
Minimum | Tax-exempt special facilities revenue bonds
Commitments and Contingencies [Line Items]
Debt instrument maturity year	2019
United Airlines, Inc.
Commitments and Contingencies [Line Items]
Debt instrument principal amount	$ 935,000,000
Number of employees	90,800
Percentage of employees represented by various U.S. labor organizations	79.00%
Boeing 777-300ER Aircraft
Commitments and Contingencies [Line Items]
Number of aircrafts expects to take delivery | Aircraft	2
Boeing 787 Aircraft
Commitments and Contingencies [Line Items]
Number of aircrafts expects to take delivery | Aircraft	3
Boeing 737 MAX Aircraft
Commitments and Contingencies [Line Items]
Number of aircrafts expects to take delivery | Aircraft	10
Boeing 767-300ER Aircraft
Commitments and Contingencies [Line Items]
Number of aircraft expected to be delivered through the remainder of 2018 | Aircraft	3
Chicago O'Hare International Airport | Facility and Other Operating Leases
Commitments and Contingencies [Line Items]
Operating lease agreement term	15 years
Operating lease description	A lease term of approximately 15 years effective May 12, 2018 through December 31, 2033.
Airbus A319 Aircraft
Commitments and Contingencies [Line Items]
Number of new aircraft committed to purchase | Aircraft	20
Airbus A319 Aircraft | Maximum
Commitments and Contingencies [Line Items]
Expected delivery date scheduled, Year	2021
Airbus A319 Aircraft | Minimum
Commitments and Contingencies [Line Items]
Expected delivery date scheduled, Year	2020

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Schedule of Acquisition of Aircrafts and Related Spare Engines (Detail) $ in Billions	Mar. 31, 2018 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
Last nine months of 2018	$ 2.4
2019	3.7
2020	2.0
2021	2.7
2022	1.8
After 2022	9.8
Total commitments	$ 22.4

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Future Minimum Lease Payments for Operating Leases (Detail) - Facility and Other Operating Leases $ in Millions	Mar. 31, 2018 USD ($)
Schedule Of Future Minimum Rental Payments For Operating Leases [Line Items]
Last nine months of 2018	$ 1,010
2019	1,209
2020	1,302
2021	1,068
2022	930
After 2022	7,576
Contractual Obligation, Total	$ 13,095

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Debt - Additional Information (Detail) $ in Billions	Mar. 31, 2018 USD ($)
United Airlines, Inc. | Secured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Available under revolving credit facility	$ 2.0

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Details of Pass Through Trusts (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Total proceeds received from issuance of debt during 2018 and recorded as debt	$ 696	$ 755
United Airlines, Inc.
Debt Instrument [Line Items]
Principal	935
Total proceeds received from issuance of debt during 2018 and recorded as debt	696	$ 755
United Airlines, Inc. | February Twenty Eighteen [Member]
Debt Instrument [Line Items]
Total proceeds received from issuance of debt during 2018 and recorded as debt	657
Remaining proceeds from issuance of debt to be received in future periods	278
United Airlines, Inc. | Class AA Pass Through Certificates | February Twenty Eighteen [Member]
Debt Instrument [Line Items]
Principal	$ 677
Final expected distribution date	2030-03
Stated interest rate	3.50%
Total proceeds received from issuance of debt during 2018 and recorded as debt	$ 476
Remaining proceeds from issuance of debt to be received in future periods	201
United Airlines, Inc. | Class A Pass Through Certificates | February Twenty Eighteen [Member]
Debt Instrument [Line Items]
Principal	$ 258
Final expected distribution date	2030-03
Stated interest rate	3.70%
Total proceeds received from issuance of debt during 2018 and recorded as debt	$ 181
Remaining proceeds from issuance of debt to be received in future periods	$ 77

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Contractual Principal Payments (Detail) - UAL and United $ in Millions	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Last nine months of 2018	$ 1,380
2019	1,218
2020	1,207
2021	1,194
2022	1,529
After 2022	7,457
Long-term debt	$ 13,985

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Components of Special Charges (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating:
Severance and benefit costs	$ 14	$ 37
Impairment of assets	23
(Gains) losses on sale of assets and other special charges	3	14
Special charges	40	51	[1]
Income tax benefit related to special charges	(9)	(18)
Total special charges, net of tax	$ 31	$ 33

[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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Special Charges - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($) Technician
Special Charges [Line Items]
Severance and benefits costs	$ 14,000,000	$ 37,000,000
Fair value adjustment for aircraft purchased	23,000,000
Fair value adjustment for aircraft purchased, net of taxes	$ 17,000,000
Severance-related accrual expected payment date	2019
Grounded aircraft related accrual expected payment date	2025
International Brotherhood of Teamsters
Special Charges [Line Items]
Severance and benefits costs	$ 8,000,000	21,000,000
Severance and benefits costs net of tax	7,000,000	$ 14,000,000
Voluntary early out program | International Brotherhood of Teamsters
Special Charges [Line Items]
Number of positions eliminated | Technician		1,000
Voluntary early out program | International Brotherhood of Teamsters | Maximum
Special Charges [Line Items]
Severance payment per participant		$ 100,000
Management Reorganization Initiative
Special Charges [Line Items]
Severance and benefits costs	6,000,000	16,000,000
Severance and benefits costs net of tax	$ 4,000,000	$ 10,000,000

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Schedule of Severance Related Accrual (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Severance and Benefits Costs
Schedule Of Accrual Activity [Line Items]
Beginning Balance	$ 37	$ 14
Accrual	14	37
Payments	(19)	(23)
Ending Balance	32	28
Permanently Grounded Aircraft
Schedule Of Accrual Activity [Line Items]
Beginning Balance	22	41
Payments	(1)	(1)
Ending Balance	$ 21	$ 40