CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 157,648	$ 150,203
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(337,694)	(289,116)
Sales of marketable securities	383,282	373,492
Acquisition of property and equipment:
Aircraft and rotable spare parts	(33,525)	(92,953)
Buildings and ground equipment	(4,250)	(10,319)
Proceeds from the sale of property and equipment	2,212	2,162
Decrease (increase) in other assets	(10,579)	19,766
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(554)	3,032
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of long-term debt		25,000
Principal payments on long-term debt	(111,158)	(107,276)
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	(8,750)	(100,001)
NET CASH USED IN FINANCING ACTIVITIES	(125,392)	(181,695)
Increase (decrease) in cash and cash equivalents	31,702	(28,460)
Cash and cash equivalents at beginning of period	148,277	102,984
CASH AND CASH EQUIVALENTS AT END OF PERIOD	179,979	74,524
Non-cash investing and financing activities:
Acquisition of property and equipment	6,575	4,649
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	30,362	33,838
Income taxes	$ 42	$ 533