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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Statement of Cash Flows [Abstract]    
NET INCOME (LOSS) $ 56,149 $ (7,881)
Depreciation and amortization 54,680 46,343
Special charges (1,835) 142
Other adjustments 1,592 6,155
Air traffic liability 100,071 145,169
Other - net 4,743 (13,927)
Net cash provided by operating activities 215,400 176,001
Cash flows from investing activities:    
Purchase of investment securities (251,937) (302,161)
Proceeds from maturities of investment securities 288,591 311,332
Aircraft pre-delivery deposits (33,516) (46,694)
Purchase of property and equipment (129,883) (71,659)
Other investing activities 12,506 (572)
Net cash (used in) investing activities (114,239) (109,754)
Cash flows from financing activities:    
Proceeds from the issuance of debt and finance lease obligations 59,516 0
Repurchase of common stock (12,470) 0
Principal payments on debt and finance lease obligations (51,492) (37,335)
Debt issuance costs (877) (308)
Other financing activities (6,554) 0
Net cash (used in) financing activities (11,877) (37,643)
NET CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH 89,284 28,604
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD 245,446 400,701
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD 334,730 429,305
CASH PAYMENTS FOR:    
Interest paid, net of amount capitalized 41,645 18,007
Income tax payments 14 17
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS:    
Flight equipment acquired under finance leases 0 68,211
Purchases of property and equipment in accrued liabilities $ 69,240 $ 37,083