CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 428,083	$ 322,962
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(751,545)	(722,347)
Sales of marketable securities	646,969	715,951
Acquisition of property and equipment:
Aircraft and rotable spare parts	(227,832)	(46,833)
Buildings and ground equipment	(13,986)	(10,180)
Proceeds from the sale of property and equipment	3,823	2,958
Deposits on aircraft	(31,078)
Decrease (increase) in other assets, net	991	(15,542)
NET CASH USED IN INVESTING ACTIVITIES	(372,658)	(75,993)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of long-term debt	47,099
Principal payments on long-term debt	(224,437)	(225,799)
Payment of debt issuance cost	(192)
Net proceeds from issuance of common stock	1,293	1,446
Employee income tax paid on vested equity awards	(27,242)	(6,930)
Purchase of treasury stock	(30,978)	(22,203)
NET CASH USED IN FINANCING ACTIVITIES	(234,457)	(253,486)
Decrease in cash and cash equivalents	(179,032)	(6,517)
Cash and cash equivalents at beginning of period	227,362	148,277
CASH AND CASH EQUIVALENTS AT END OF PERIOD	48,330	141,760
Non-cash investing and financing activities:
Acquisition of property and equipment	16,571	28,244
Cash paid during the period for:
Interest, net of capitalized amounts	53,311	58,801
Income taxes, net of refunds	$ 9,090	$ 14,268