CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net Income	$ (132)	$ (142)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	126	104
Stock-based compensation and other	19	23
Special items - fleet transition and other (noncash)	23	13
Special items - labor and related (noncash)	0	51
Changes in certain assets and liabilities:
Changes in deferred tax provision	(47)	56
Increase (Decrease) in Accounts Receivable	(55)	(44)
Increase (Decrease) in Contract with Customer, Liability	468	433
Increase in deferred revenue	30	46
Other - net	(140)	(206)
Net cash provided by operating activities	292	222
Property and equipment additions:
Aircraft and aircraft purchase deposits	31	(50)
Other flight equipment	(44)	(50)
Other property and equipment	(44)	(24)
Total property and equipment additions, including capitalized interest	(57)	(124)
Supplier Proceeds	162	0
Purchases of marketable securities	(13)	(201)
Sales and maturities of marketable securities	133	388
Other investing activities	93	(3)
Net cash used in investing activities	318	60
Cash flows from financing activities:
Proceeds from issuance of debt	149	0
Common stock repurchases	(20)	(18)
Long-term debt payments	(102)	(96)
Other financing activities	(32)	0
Net cash provided by (used in) financing activities	(5)	(114)
Net increase in cash, cash equivalents, and restricted cash	605	168
Cash, cash equivalents, and restricted cash at beginning of year	308	369
Cash, cash equivalents, and restricted cash at end of the period	913	537
Cash paid during the period for:
Interest (net of amount capitalized)	35	32
Non-cash transactions:
Right-of-use assets acquired through operating leases	13	111
Noncash or Part Noncash Acquisition, Fixed Assets Acquired	45	0
Reconciliation of cash, cash equivalents, and restricted cash at end of the period
Cash and cash equivalents	885	516
Restricted cash included in Prepaid expenses, assets held-for-sale and other current assets	28	21
Total cash, cash equivalents, and restricted cash at end of the period	$ 913	$ 537