CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash Flows from Operating Activities:
Net Income	$ 6	$ 88
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	393	254
Stock-based compensation and other	10	37
Non-cash special items	52	0
Changes in certain assets and liabilities:
Changes in deferred income taxes	1	47
Increase in accounts receivable	(171)	(55)
Increase in air traffic liability	415	440
Increase in deferred revenue	216	38
Other - net	(87)	23
Net cash provided by operating activities	835	872
Property and equipment additions
Aircraft and aircraft purchase deposits	(523)	(380)
Other flight equipment	(90)	(63)
Other property and equipment	(128)	(144)
Supplier proceeds	0	162
Purchases of marketable securities	(844)	(163)
Sales and maturities of marketable securities	765	288
Other investing activities	73	165
Net cash used in investing activities	(747)	(135)
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt, net of issuance costs	168	279
Long-term debt payments	(236)	(149)
Common stock repurchases	(535)	(49)
Other financing activities	59	6
Net cash provided by (used in) financing activities	(544)	87
Net (decrease) increase in cash and cash equivalents	(456)	824
Cash, cash equivalents, and restricted cash at beginning of period	1,257	308
Cash, cash equivalents, and restricted cash at end of the period	801	1,132
Cash paid during the period for:
Interest, net of amount capitalized	108	55
Non-cash transactions:
Right-of-use assets acquired through operating leases	74	34
Property and equipment acquired through the issuance of debt	69	68
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	750	1,115
Restricted cash	28	0
Restricted cash included in Other noncurrent assets	23	17
Total cash, cash equivalents, and restricted cash at end of the period	$ 801	$ 1,132