CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Cash Flows from Operating Activities:
Net Income (Loss)	$ (147)	$ 73	$ (416)	$ 79
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	216	203	627	596
Stock-based compensation and other			64	(9)
Non-cash special items			0	52
Changes in certain assets and liabilities:
Changes in deferred income taxes			(98)	37
Increase in accounts receivable			(94)	(26)
Increase in air traffic liability			440	226
Increase in deferred revenue			111	177
Other - net			121	(68)
Net cash provided by operating activities			755	1,064
Property and equipment additions
Aircraft, aircraft purchase deposits, and other flight equipment			(790)	(744)
Other property and equipment			(175)	(219)
Purchases of marketable securities			(1,014)	(1,239)
Sales and maturities of marketable securities			1,090	1,047
Other investing activities			(3)	159
Net cash used in investing activities			(892)	(996)
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt, net of issuance costs			1,099	378
Long-term debt payments			(511)	(389)
Common stock repurchases			(250)	(540)
Other financing activities			29	61
Net cash provided by (used in) financing activities			367	(490)
Net increase (decrease) in cash and cash equivalents			230	(422)
Cash, cash equivalents, and restricted cash at beginning of period			684	1,257
Cash, cash equivalents, and restricted cash at end of period	914	835	914	835
Cash paid during the period for:
Interest, net of amount capitalized			191	177
Non-cash transactions:
Right-of-use assets acquired through operating leases			206	167
Property and equipment acquired through the issuance of debt			72	69
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	835	778	835	778
Restricted cash	34	28	34	28
Restricted cash included in Other noncurrent assets	45	29	45	29
Total cash, cash equivalents, and restricted cash at end of period	$ 914	$ 835	$ 914	$ 835