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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS    
NET CASH PROVIDED BY OPERATING ACTIVITIES $ 144,477 $ 171,023
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of marketable securities (169,843) (349,334)
Sales of marketable securities 192,022 351,614
Acquisition of property and equipment:    
Aircraft and rotable spare parts (88,109) (64,857)
Buildings and ground equipment (14,046) (8,453)
Deposits on aircraft (6,457) (5,140)
Proceeds from the sale of property and equipment 247 118
Decrease in other assets, net 3,358 9,943
NET CASH USED IN INVESTING ACTIVITIES (82,828) (66,109)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of long-term debt 117,565  
Principal payments on long-term debt (116,196) (113,672)
Payment of debt issuance cost (175)  
Net proceeds from issuance of common stock 1,313 1,293
Employee income tax paid on vested equity awards (45,637) (27,242)
Purchase of treasury stock and related excise tax (75,351) (13,682)
NET CASH USED IN FINANCING ACTIVITIES (118,481) (153,303)
Decrease in cash and cash equivalents (56,832) (48,389)
Cash and cash equivalents at beginning of period 122,673 227,362
CASH AND CASH EQUIVALENTS AT END OF PERIOD 65,841 178,973
Non-cash investing and financing activities:    
Change in accrued capital expenditures for the period 27,974 45,606
Cash paid during the period for:    
Interest, net of capitalized amounts 28,680 27,637
Income taxes, net of refunds $ 1,080 $ (18)