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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Statement of Cash Flows [Abstract]    
NET INCOME (LOSS) $ (919) $ 56,149
Depreciation and amortization 63,844 54,680
Special charges, net of recoveries 12,858 (1,835)
Other adjustments 2,893 1,592
Air traffic liability 79,072 100,071
Other - net 10,057 4,743
Net cash provided by operating activities 167,805 215,400
Cash flows from investing activities:    
Purchase of investment securities (176,119) (251,937)
Proceeds from maturities of investment securities 246,663 288,591
Aircraft pre-delivery deposits (35,053) (33,516)
Purchase of property and equipment (131,862) (129,883)
Other investing activities 2,787 12,506
Net cash used in investing activities (93,584) (114,239)
Cash flows from financing activities:    
Cash dividends paid to shareholders (10,952) 0
Proceeds from the issuance of debt and finance lease obligations 18,755 59,516
Repurchase of common stock (143) (12,470)
Principal payments on debt and finance lease obligations (31,512) (51,492)
Debt issuance costs 0 (877)
Other financing activities 320 (6,554)
Net cash used in financing activities (23,532) (11,877)
NET CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH 50,689 89,284
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD 159,584 245,446
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD 210,273 334,730
CASH PAYMENTS FOR:    
Interest paid, net of amount capitalized 31,971 41,645
Income tax payments 32 14
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS:    
Right-of-use (ROU) assets acquired 1,379 0
Purchases of property and equipment in accrued liabilities $ 40,935 $ 69,240