CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash Flows from Operating Activities:
Net Loss	$ (193)	$ (166)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	204	194
Stock-based compensation and other	25	20
Non-cash special items	0	52
Changes in certain assets and liabilities:
Changes in deferred income taxes	(124)	(65)
Increase in accounts receivable	(65)	(11)
Increase in air traffic liability	689	492
Increase in deferred revenue	48	58
Other - net	(163)	(115)
Net cash provided by operating activities	421	459
Property and equipment additions
Aircraft, aircraft purchase deposits, and other flight equipment	(308)	(196)
Other property and equipment	(30)	(42)
Purchases of marketable securities	(332)	(470)
Sales and maturities of marketable securities	504	336
Other investing activities	(3)	(9)
Net cash used in investing activities	(169)	(381)
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt, net of issuance costs	110	0
Long-term debt payments	(340)	(156)
Common stock repurchases	(193)	(105)
Other financing activities	(5)	25
Net cash used in financing activities	(428)	(236)
Net decrease in cash and cash equivalents	(176)	(158)
Cash, cash equivalents, and restricted cash at beginning of period	684	1,257
Cash, cash equivalents, and restricted cash at end of period	508	1,099
Cash paid during the period for:
Interest, net of amount capitalized	70	67
Non-cash transactions:
Right-of-use assets acquired through operating leases	78	62
Property and equipment acquired through the issuance of debt	0	23
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	451	1,044
Restricted cash	27	28
Restricted cash included in Other noncurrent assets	30	27
Total cash, cash equivalents, and restricted cash at end of period	$ 508	$ 1,099