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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS    
NET CASH PROVIDED BY OPERATING ACTIVITIES $ 708,860 $ 506,565
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of marketable securities (980,277) (1,212,208)
Sales of marketable securities 845,885 1,240,771
Acquisition of property and equipment:    
Aircraft and rotable spare parts (339,265) (126,055)
Buildings and ground equipment (24,834) (21,685)
Proceeds from the sale of property and equipment 5,502 4,117
Deposits on aircraft (31,078)  
Decrease (increase) in other assets, net 4,860 (3,941)
NET CASH USED IN INVESTING ACTIVITIES (519,207) (119,001)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of long-term debt 47,099 23,059
Principal payments on long-term debt (337,055) (338,221)
Payment of debt issuance cost (192) (336)
Net proceeds from issuance of common stock 2,651 2,864
Employee income tax paid on vested equity awards (27,242) (6,930)
Purchase of treasury stock and excise tax (57,748) (38,668)
NET CASH USED IN FINANCING ACTIVITIES (372,487) (358,232)
Increase (decrease) in cash and cash equivalents (182,834) 29,332
Cash and cash equivalents at beginning of period 227,362 148,277
CASH AND CASH EQUIVALENTS AT END OF PERIOD 44,528 177,609
Non-cash investing and financing activities:    
Change in accrued capital expenditures for the period (50,315) 15,979
Cash paid during the period for:    
Interest, net of capitalized amounts 81,980 87,072
Income taxes, net of refunds $ 13,223 $ 14,930