CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash Flows from Operating Activities:
Net Loss	$ (166)	$ (132)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	194	126
Stock-based compensation and other	20	19
Non-cash special items	52	23
Changes in certain assets and liabilities:
Changes in deferred income taxes	(65)	(47)
Increase in accounts receivable	(11)	(55)
Increase in air traffic liability	492	468
Increase in deferred revenue	58	30
Other - net	(115)	(140)
Net cash provided by operating activities	459	292
Property and equipment additions
Aircraft and aircraft purchase deposits	(142)	31
Other flight equipment	(54)	(44)
Other property and equipment	(42)	(44)
Supplier proceeds	0	162
Purchases of marketable securities	(470)	(13)
Sales and maturities of marketable securities	336	133
Other investing activities	(9)	93
Net cash provided by (used in) investing activities	(381)	318
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt, net of issuance costs	0	149
Long-term debt payments	(156)	(102)
Common stock repurchases	(105)	(20)
Other financing activities	25	(32)
Net cash used in financing activities	(236)	(5)
Net increase (decrease) in cash and cash equivalents	(158)	605
Cash, cash equivalents, and restricted cash at beginning of period	1,257	308
Cash, cash equivalents, and restricted cash at end of the period	1,099	913
Cash paid during the period for:
Interest, net of amount capitalized	67	35
Non-cash transactions:
Right-of-use assets acquired through operating leases	62	13
Property and equipment acquired through the issuance of debt	23	45
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	1,044	885
Restricted cash	28	0
Restricted cash included in Other noncurrent assets	27	28
Total cash, cash equivalents, and restricted cash at end of the period	$ 1,099	$ 913