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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS    
NET CASH PROVIDED BY OPERATING ACTIVITIES $ 567,615 $ 708,860
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of marketable securities (510,587) (980,277)
Sales of marketable securities 596,502 845,885
Acquisition of property and equipment:    
Aircraft and rotable spare parts (357,474) (339,265)
Buildings and ground equipment (28,513) (24,834)
Deposits paid on aircraft (29,837) (31,078)
Proceeds from the sale of property and equipment 519 5,502
Decrease in other assets, net 9,722 4,860
NET CASH USED IN INVESTING ACTIVITIES (319,668) (519,207)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of long-term debt 328,843 47,099
Principal payments on long-term debt (357,645) (337,055)
Payment of debt issuance cost (917) (192)
Net proceeds from issuance of common stock 2,818 2,651
Employee income tax paid on vested equity awards (45,637) (27,242)
Purchase of treasury stock and related excise tax (226,331) (57,748)
NET CASH USED IN FINANCING ACTIVITIES (298,869) (372,487)
Decrease in cash and cash equivalents (50,922) (182,834)
Cash and cash equivalents at beginning of period 122,673 227,362
CASH AND CASH EQUIVALENTS AT END OF PERIOD 71,751 44,528
Non-cash investing and financing activities:    
Change in accrued capital expenditures for the period 58,548 (50,315)
Cash paid during the period for:    
Interest, net of capitalized amounts 79,682 81,980
Income taxes, net of refunds $ 4,517 $ 13,223