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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Statement of Cash Flows [Abstract]    
NET INCOME (LOSS) $ (7,881) $ 6,869
Depreciation and amortization 46,343 43,174
Special charges 142 1,738
Other adjustments 6,155 8,318
Air traffic liability 145,169 95,541
Other - net (13,927) 12,353
Net cash provided by operating activities 176,001 167,993
Cash flows from investing activities:    
Purchase of investment securities (302,161) (89,338)
Proceeds from maturities of investment securities 311,332 194,534
Aircraft pre-delivery deposits (46,694) (3,300)
Purchase of property and equipment (71,659) (66,199)
Other investing activities (572) (16)
Net cash provided by (used in) investing activities (109,754) 35,681
Cash flows from financing activities:    
Proceeds from the issuance of debt and finance lease obligations 0 105,000
Principal payments on debt and finance lease obligations (37,335) (151,517)
Debt issuance costs (308) (649)
Net cash (used in) financing activities (37,643) (47,166)
NET CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH 28,604 156,508
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD 400,701 170,319
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD 429,305 326,827
CASH PAYMENTS (RECEIPTS) FOR:    
Interest paid, net of amount capitalized 18,007 15,059
Income tax payments (refunds) 17 (138)
Supplemental Cash Flow Information [Abstract]    
Right-of-use (ROU) assets acquired 0 4,733
Flight equipment acquired under finance leases 68,211 0
Purchases of property and equipment in accrued liabilities $ 37,083 $ 4,064