CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net Income	$ 324	$ 237
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	393	330
Stock-based compensation and other	55	73
Special items - labor and related (noncash)	4	395
Changes in certain assets and liabilities:
Changes in deferred tax provision	127	(90)
Increase (Decrease) in Accounts Receivable	(85)	(45)
Increase (Decrease) in Contract with Customer, Liability	229	179
Increase in deferred revenue	52	102
Other - net	91	(258)
Net cash provided by operating activities	1,190	1,103
Property and equipment additions:
Aircraft and aircraft purchase deposits	(532)	(669)
Other flight equipment	(118)	(153)
Other property and equipment	(202)	(169)
Payments to Acquire Businesses, Net of Cash Acquired	(659)	0
Supplier Proceeds	162	0
Purchases of marketable securities	(428)	(519)
Sales and maturities of marketable securities	1,153	806
Other investing activities	188	(106)
Net cash used in investing activities	(436)	(810)
Cash flows from financing activities:
Proceeds from issuance of debt	344	313
Common stock repurchases	(63)	(70)
Long-term debt payments	(279)	(242)
Other financing activities	5	11
Net cash provided by (used in) financing activities	7	12
Net increase in cash, cash equivalents, and restricted cash	761	305
Cash, cash equivalents, and restricted cash at beginning of year	308	369
Cash, cash equivalents, and restricted cash at end of the period	1,069	674
Cash paid during the period for:
Interest (net of amount capitalized)	107	85
Income taxes	2	14
Non-cash transactions:
Right-of-use assets acquired through operating leases	35	120
Operating lease converted to finance lease	0	505
Noncash or Part Noncash Acquisition, Fixed Assets Acquired	68	179
Reconciliation of cash, cash equivalents, and restricted cash at end of the period
Cash and cash equivalents	1,015	647
Restricted Cash	27	0
Restricted cash included in Prepaid expenses, assets held-for-sale and other current assets	27	27
Total cash, cash equivalents, and restricted cash at end of the period	$ 1,069	$ 674