CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net Income	$ 235	$ 58	$ 478
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	451	415	394
Stock-based compensation and other	85	42	51
Special Items - Impairment charges and other (noncash)	371	496	(1)
Special items - labor and related (noncash)	51	0	0
Restructuring Charges	0	0	(10)
Changes in certain assets and liabilities:
Changes in deferred income taxes	81	22	104
(Increase) decrease in accounts receivable	(19)	(45)	(69)
Increase (decrease) in air traffic liability	(44)	17	90
Increase in deferred revenue	106	139	81
Pension contribution	0	0	(100)
Proceeds from Income Tax Refunds	0	295	3
Other - net	(267)	(21)	9
Net cash provided by operating activities	1,050	1,418	1,030
Property and equipment additions:
Aircraft and aircraft purchase deposits	(1,055)	(1,272)	(68)
Other flight equipment	(197)	(208)	(126)
Other property and equipment	(242)	(191)	(98)
Total property and equipment additions	(1,494)	(1,671)	(292)
Purchases of marketable securities	(536)	(1,797)	(4,301)
Sales and maturities of marketable securities	1,152	2,252	3,595
Proceeds from Sale of Productive Assets	32	4	2
Other investing activities	(118)	(6)	(12)
Net cash used in investing activities	(964)	(1,218)	(1,008)
Cash flows from financing activities:
Proceeds from issuance of long-term debt, net of issuance costs	411	0	363
Long-term debt payments	(282)	(385)	(1,334)
Common stock repurchases	(137)	0	0
Other financing activities	(139)	60	57
Net cash used in financing activities	(147)	(325)	(914)
Net decrease in cash and cash equivalents	(61)	(125)	(892)
Cash, cash equivalents, and restricted cash at beginning of period	369	494	1,386
Cash, cash equivalents, and restricted cash at end of period	308	369	494
Cash and cash equivalents	$ 281	$ 338	$ 470