CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 150,203	$ 20,508
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(289,116)	(595,325)
Sales of marketable securities	373,492	586,864
Acquisition of property and equipment:
Aircraft and rotable spare parts	(92,953)	(111,782)
Buildings and ground equipment	(10,319)	(2,236)
Proceeds from the sale of property and equipment	2,162	2,749
Deposits on aircraft		(28,031)
Aircraft deposits applied towards acquired aircraft		23,481
Decrease (increase) in other assets	19,766	(387)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	3,032	(124,667)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of long-term debt	25,000	185,740
Principal payments on long-term debt	(107,276)	(93,979)
Payment of debt issuance cost	(108)	(413)
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	(100,001)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(181,695)	91,739
Decrease in cash and cash equivalents	(28,460)	(12,420)
Cash and cash equivalents at beginning of period	102,984	258,421
CASH AND CASH EQUIVALENTS AT END OF PERIOD	74,524	246,001
Non-cash investing and financing activities:
Acquisition of property and equipment	4,649	13,567
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	33,838	29,840
Income taxes	$ 533	$ 116