CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
CONSOLIDATED STATEMENTS OF CASH FLOWS
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 215,279	$ 498,688
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(1,254,213)	(798,877)
Sales of marketable securities	975,649	799,241
Acquisition of property and equipment:
Aircraft and rotable spare parts	(301,004)	(63,450)
Buildings and ground equipment	(9,525)	(8,700)
Proceeds from the sale of property and equipment	6,275	2,282
Deposits on aircraft	(37,100)	(58,269)
Aircraft deposits applied towards acquired aircraft	70,501
Increase in other assets	(7,172)	(54,608)
NET CASH USED IN INVESTING ACTIVITIES	(556,589)	(182,381)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of long-term debt	376,753	95,430
Principal payments on long-term debt	(196,961)	(281,778)
Net proceeds from issuance of common stock	1,514	1,745
Employee income tax paid on vested equity awards	(1,123)	(1,573)
Payment of debt issuance cost	(1,223)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	178,960	(186,176)
Increase (decrease) in cash and cash equivalents	(162,350)	130,131
Cash and cash equivalents at beginning of period	258,421	215,723
CASH AND CASH EQUIVALENTS AT END OF PERIOD	96,071	345,854
Non-cash investing and financing activities:
Acquisition of property and equipment	18,234	11,797
Warrants issued to U.S. Treasury		5,804
Cash paid during the period for:
Interest, net of capitalized amounts	60,197	66,767
Income taxes	$ 217	$ 457