CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 511,907	$ 343,535
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(982,331)	(1,758,125)
Sales of marketable securities	1,236,009	1,390,198
Acquisition of property and equipment:
Aircraft and rotable spare parts	(151,600)	(522,683)
Buildings and ground equipment	(13,978)	(11,365)
Proceeds from the sale of property and equipment	6,574	8,494
Deposits on aircraft	(55,528)	(37,100)
Aircraft deposits applied towards acquired aircraft		115,085
Decrease (increase) in other assets	21,857	(49,073)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	61,003	(864,569)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of long-term debt	25,000	601,389
Principal payments on long-term debt	(331,183)	(299,785)
Payment of debt issuance cost	(108)	(1,949)
Net proceeds from issuance of common stock	2,811	2,958
Employee income tax paid on vested equity awards	(585)	(1,150)
Purchase of treasury stock	(246,499)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(550,564)	301,463
Increase (decrease) in cash and cash equivalents	22,346	(219,571)
Cash and cash equivalents at beginning of period	102,984	258,421
CASH AND CASH EQUIVALENTS AT END OF PERIOD	125,330	38,850
Non-cash investing and financing activities:
Acquisition of property and equipment	16,614	15,801
Derecognition of right of use assets	(39,247)
Derecognition of operating lease liabilities	39,247
Cash paid during the period for:
Interest, net of capitalized amounts	98,196	92,230
Income taxes	$ 9,184	$ 356