CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 506,565	$ 511,907
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(1,212,208)	(982,331)
Sales of marketable securities	1,240,771	1,236,009
Acquisition of property and equipment:
Aircraft and rotable spare parts	(131,880)	(151,600)
Buildings and ground equipment	(21,685)	(13,978)
Proceeds from the sale of property and equipment	4,117	6,574
Deposits on aircraft		(55,528)
Aircraft deposits applied towards acquired aircraft	5,825
Decrease (increase) in other assets	(3,941)	21,857
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	(119,001)	61,003
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of long-term debt	23,059	25,000
Principal payments on long-term debt	(338,221)	(331,183)
Payment of debt issuance cost	(336)	(108)
Net proceeds from issuance of common stock	2,864	2,811
Employee income tax paid on vested equity awards	(6,930)	(585)
Purchase of treasury stock and excise tax	(38,668)	(246,499)
NET CASH USED IN FINANCING ACTIVITIES	(358,232)	(550,564)
Increase in cash and cash equivalents	29,332	22,346
Cash and cash equivalents at beginning of period	148,277	102,984
CASH AND CASH EQUIVALENTS AT END OF PERIOD	177,609	125,330
Non-cash investing and financing activities:
Acquisition of property and equipment	15,979	16,614
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	87,072	98,196
Income taxes	$ 14,930	$ 9,184