CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 333,023	$ 215,279
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(533,465)	(1,254,213)
Sales of marketable securities	732,774	975,649
Acquisition of property and equipment:
Aircraft and rotable spare parts	(122,529)	(301,004)
Buildings and ground equipment	(11,338)	(9,525)
Proceeds from the sale of property and equipment	3,815	6,275
Deposits on aircraft		(37,100)
Aircraft deposits applied towards acquired aircraft		70,501
Decrease (increase) in other assets	734	(7,172)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	69,991	(556,589)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of long-term debt	25,000	376,753
Principal payments on long-term debt	(221,148)	(196,961)
Payment of debt issuance cost	(108)	(1,223)
Net proceeds from issuance of common stock	1,275	1,514
Employee income tax paid on vested equity awards	(585)	(1,123)
Purchase of treasury stock	(195,999)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(391,565)	178,960
Increase (decrease) in cash and cash equivalents	11,449	(162,350)
Cash and cash equivalents at beginning of period	102,984	258,421
CASH AND CASH EQUIVALENTS AT END OF PERIOD	114,433	96,071
Non-cash investing and financing activities:
Acquisition of property and equipment	73	18,234
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	66,131	60,197
Income taxes	$ 2,902	$ 217