CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net Income	$ 395	$ 235	$ 58
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	583	451	415
Stock-based compensation and other	63	85	42
Special items	(70)	422	496
Changes in certain assets and liabilities:
Changes in deferred income taxes	135	81	22
(Increase) decrease in accounts receivable	(128)	(19)	(45)
Increase (decrease) in air traffic liability	63	(44)	17
Increase in deferred revenue	116	106	139
Federal income tax refund	0	0	295
Other - net	307	(267)	(21)
Net cash provided by operating activities	1,464	1,050	1,418
Property and equipment additions:
Aircraft and aircraft purchase deposits	(817)	(1,055)	(1,272)
Other flight equipment	(171)	(197)	(208)
Other property and equipment	(293)	(242)	(191)
Acquisition of Hawaiian, net of cash acquired	(659)	0	0
Supplier proceeds	162	0	0
Purchases of marketable securities	(832)	(536)	(1,797)
Sales and maturities of marketable securities	1,761	1,152	2,252
Other investing activities	215	(86)	(2)
Net cash used in investing activities	(634)	(964)	(1,218)
Cash flows from financing activities:
Proceeds from issuance of long-term debt, net of issuance costs	2,310	411	0
Long-term debt payments	(1,915)	(282)	(385)
Common stock repurchases	(312)	(137)	0
Other financing activities	36	(139)	60
Net cash provided by (used in) financing activities	119	(147)	(325)
Net increase (decrease) in cash and cash equivalents	949	(61)	(125)
Cash, cash equivalents, and restricted cash at beginning of period	308	369	494
Cash, cash equivalents, and restricted cash at end of period	1,257	308	369
Cash paid during the year for:
Interest, net of amount capitalized	148	105	71
Income taxes, net of refunds received	22	15	0
Non-cash transactions:
Right-of-use assets acquired through operating leases	35	178	461
Operating leases converted to finance leases	0	505	0
Property and equipment acquired through the issuance of debt	68	179	0
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	1,201	281	338
Restricted cash	29	0	0
Restricted cash included in Other noncurrent assets	27	27	31
Total cash, cash equivalents, and restricted cash at end of period	$ 1,257	$ 308	$ 369