CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Cash Flows from Operating Activities:
Net Income (Loss)	$ (76)	$ 172	$ (269)	$ 6
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	207	199	411	393
Stock-based compensation and other			42	10
Non-cash special items			0	52
Changes in certain assets and liabilities:
Changes in deferred income taxes			(262)	1
Increase in accounts receivable			(119)	(171)
Increase in air traffic liability			709	415
Increase in deferred revenue			97	216
Other - net			(3)	(87)
Net cash provided by operating activities			606	835
Property and equipment additions
Aircraft, aircraft purchase deposits, and other flight equipment			(415)	(613)
Other property and equipment			(108)	(128)
Purchases of marketable securities			(872)	(844)
Sales and maturities of marketable securities			761	765
Other investing activities			(1)	73
Net cash used in investing activities			(635)	(747)
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt, net of issuance costs			1,099	168
Long-term debt payments			(405)	(236)
Common stock repurchases			(250)	(535)
Other financing activities			28	59
Net cash provided by (used in) financing activities			472	(544)
Net increase (decrease) in cash and cash equivalents			443	(456)
Cash, cash equivalents, and restricted cash at beginning of period			684	1,257
Cash, cash equivalents, and restricted cash at end of period	1,127	801	1,127	801
Cash paid during the period for:
Interest, net of amount capitalized			114	108
Non-cash transactions:
Right-of-use assets acquired through operating leases			174	74
Property and equipment acquired through the issuance of debt			48	69
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	1,064	750	1,064	750
Restricted cash	33	28	33	28
Restricted cash included in Other noncurrent assets	30	23	30	23
Total cash, cash equivalents, and restricted cash at end of period	$ 1,127	$ 801	$ 1,127	$ 801