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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss		$ (247)	$ (268)
Adjustments to reconcile net loss to net cash provided by operating activities:
Deferred income taxes		(97)	(83)
Impairment of long-lived assets		0	202
Depreciation		117	127
Amortization		8	12
Stock-based compensation		8	9
Changes in certain operating assets and liabilities		304	129
Deferred federal payroll support program grants		87	0
Other, net		(3)	(4)
Net cash provided by operating activities		177	124
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures		(211)	(314)
Predelivery deposits for flight equipment		(6)	(53)
Purchase of available-for-sale securities		0	(207)
Proceeds from the sale of available-for-sale securities		270	395
Other, net		(1)	0
Net cash provided by (used in) investing activities		52	(179)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of long-term debt		855	0
Proceeds from short-term borrowings		0	983
Proceeds from issuance of stock warrants		8	0
Repayment of long-term debt and finance lease obligations		(644)	(102)
Acquisition of treasury stock		(6)	(166)
Other, net		(1)	(1)
Net cash provided by financing activities		212	714
INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		441	659
Cash, cash equivalents and restricted cash at beginning of period		1,969	1,018
Cash, cash equivalents and restricted cash at end of period	[1]	2,410	1,677
SUPPLEMENTAL CASH FLOW INFORMATION
Cash payments for interest (net of amount capitalized)		37	18
Cash payments for income taxes (net of refunds)		0	1
Operating lease assets obtained in exchange for operating lease liabilities		0	2
Total cash, cash equivalents and restricted cash	[1]	$ 2,410	$ 1,677
[1] Reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets:

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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Amount of noncash expense for share-based payment arrangement.

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