Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ (102,000,000)	$ (225,000,000)	$ 251,000,000
Deferred income taxes	(32,000,000)	(14,000,000)	52,000,000
Depreciation and amortization	38,000,000	33,000,000	46,000,000
Gains recognized on sale-leaseback transactions	(60,000,000)	(48,000,000)	(107,000,000)
Warrant liability unrealized loss	22,000,000	9,000,000	0
Stock-based compensation	11,000,000	8,000,000	8,000,000
Amortization of swaption cash flow hedges, net of tax	1,000,000	0	0
Cash flows for derivative instruments, net	0	(4,000,000)	(1,000,000)
Cash flows from operating leases	0	17,000,000	0
Changes in operating assets and liabilities:
Accounts receivable	(14,000,000)	61,000,000	(6,000,000)
Supplies and other current assets	174,000,000	(166,000,000)	(18,000,000)
Aircraft maintenance deposits	(20,000,000)	(15,000,000)	(18,000,000)
Other long-term assets	(37,000,000)	(32,000,000)	(29,000,000)
Accounts payable	13,000,000	0	24,000,000
Air traffic liability	138,000,000	(114,000,000)	36,000,000
Other liabilities	84,000,000	(67,000,000)	(67,000,000)
Cash provided by (used in) operating activities	216,000,000	(557,000,000)	171,000,000
Cash flows from investing activities:
Capital expenditures	(27,000,000)	(16,000,000)	(45,000,000)
Pre-delivery deposits for flight equipment, net of refunds	(36,000,000)	28,000,000	(17,000,000)
Other	(4,000,000)	(1,000,000)	0
Cash provided by (used in) investing activities	(67,000,000)	11,000,000	(62,000,000)
Cash flows from financing activities:
Proceeds from issuance of debt	163,000,000	236,000,000	170,000,000
Principal repayments on debt	(97,000,000)	(126,000,000)	(139,000,000)
Proceeds from sale-leaseback transactions	59,000,000	47,000,000	92,000,000
Proceeds from initial public offering, net of offering costs, underwriting discounts and commissions	266,000,000	0	0
Proceeds from the exercise of stock options	3,000,000	0	0
Dividends paid	0	0	(159,000,000)
Tax withholdings on share-based awards	(3,000,000)	(1,000,000)	0
Other	0	0	(3,000,000)
Cash provided by (used in) financing activities	391,000,000	156,000,000	(39,000,000)
Net increase (decrease) in cash, cash equivalents and restricted cash	540,000,000	(390,000,000)	70,000,000
Cash, cash equivalents and restricted cash, beginning of period	378,000,000	768,000,000	698,000,000
Cash, cash equivalents and restricted cash, end of period	$ 918,000,000	$ 378,000,000	$ 768,000,000