CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 322,962	$ 333,023
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(722,347)	(533,465)
Sales of marketable securities	715,951	732,774
Acquisition of property and equipment:
Aircraft and rotable spare parts	(46,833)	(122,529)
Buildings and ground equipment	(10,180)	(11,338)
Proceeds from the sale of property and equipment	2,958	3,815
Decrease (increase) in other assets	(15,542)	734
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(75,993)	69,991
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of long-term debt		25,000
Principal payments on long-term debt	(225,799)	(221,148)
Payment of debt issuance cost		(108)
Net proceeds from issuance of common stock	1,446	1,275
Employee income tax paid on vested equity awards	(6,930)	(585)
Purchase of treasury stock and excise tax	(22,203)	(195,999)
NET CASH USED IN FINANCING ACTIVITIES	(253,486)	(391,565)
Increase (decrease) in cash and cash equivalents	(6,517)	11,449
Cash and cash equivalents at beginning of period	148,277	102,984
CASH AND CASH EQUIVALENTS AT END OF PERIOD	141,760	114,433
Non-cash investing and financing activities:
Acquisition of property and equipment	28,244	73
Derecognition of right of use assets		(35,062)
Derecognition of operating lease liabilities		35,062
Cash paid during the period for:
Interest, net of capitalized amounts	58,801	66,131
Income taxes	$ 14,268	$ 2,902