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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Statement of Cash Flows [Abstract]    
NET INCOME (LOSS) $ (3,523) $ 101,896
Depreciation and amortization 95,526 87,696
Special charges 284 2,592
Other adjustments 13,657 18,184
Air traffic liability 143,634 129,220
Deferred Payroll Support Programs grant recognition 0 49,210
Other - net (21,796) 16,175
Net cash provided by operating activities 227,782 404,973
Cash flows from investing activities:    
Purchase of investment securities (672,318) (673,722)
Proceeds from maturities of investment securities 675,656 436,364
Aircraft pre-delivery deposits (51,111) (3,300)
Purchase of property and equipment (205,158) (131,184)
Other investing activities 645 2,443
Net cash (used in) investing activities (252,286) (369,399)
Cash flows from financing activities:    
Proceeds from the issuance of debt and finance lease obligations 195,800 106,657
Principal payments on debt and finance lease obligations (70,502) (199,627)
Debt issuance costs (669) (606)
Proceeds from issuance of common stock 0 335,137
Other financing activities (82,775) 3,936
Net cash provided by financing activities 41,854 245,497
NET CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH 17,350 281,071
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD 400,701 170,319
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD 418,051 451,390
CASH PAYMENTS (RECEIPTS) FOR:    
Interest paid, net of amount capitalized 36,828 26,379
Income tax payments (refunds) (46) 4,873
Supplemental Cash Flow Information [Abstract]    
Right-of-use (ROU) assets acquired 0 23,157
Flight equipment acquired under finance leases 90,476 13,833
Purchases of property and equipment in accrued liabilities $ 45,887 $ 5,088