CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating Activities
Net income	$ 1,088,387	$ 427,704	$ 614,622
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of flight equipment	1,223,532	1,143,761	1,068,772
Recoveries of Russian fleet write-off	(736,409)	0	(67,022)
Stock-based compensation expense	48,930	33,887	34,615
Deferred taxes	150,998	63,021	133,358
Amortization of prepaid lease costs	93,546	101,800	75,389
Amortization of discounts and debt issuance costs	52,799	54,823	54,053
Gain on aircraft sales, trading and other activity	(261,085)	(228,466)	(226,945)
Changes in operating assets and liabilities:
Other assets	100,331	12,521	48,310
Accrued interest and other payables	(33,618)	75,172	13,333
Rentals received in advance	7,218	(7,204)	(1,605)
Net cash provided by operating activities	1,734,629	1,677,019	1,746,880
Investing Activities
Acquisition of flight equipment	(2,348,253)	(3,727,416)	(3,789,113)
Payments for deposits on flight equipment purchases	(1,045,667)	(446,343)	(433,452)
Proceeds from aircraft sales, trading and other activity	1,582,970	1,524,711	1,684,814
Proceeds from settlement of insurance claims	727,572	0	64,714
Acquisition of aircraft furnishings, equipment and other assets	(237,683)	(387,255)	(305,346)
Net cash used in investing activities	(1,321,061)	(3,036,303)	(2,778,383)
Financing Activities
Net proceeds from preferred stock issuance	0	295,012	0
Redemption of preferred stock	0	(250,000)	0
Cash dividends paid on Class A common stock	(98,267)	(93,481)	(88,792)
Cash dividends paid on preferred stock	(44,325)	(47,762)	(41,700)
Tax withholdings on stock-based compensation	(30,221)	(9,387)	(3,354)
Net change in unsecured revolving facilities	130,000	(930,000)	80,000
Net change in commercial paper balance	1,361,400	0	0
Proceeds from debt financings	683,074	5,201,695	2,993,732
Payments in reduction of debt financings	(2,816,359)	(3,210,028)	(2,593,338)
Debt issuance costs	(4,665)	(10,277)	(13,052)
Security deposits and maintenance reserve receipts	489,668	452,022	398,345
Security deposits and maintenance reserve disbursements	(90,027)	(26,898)	(15,863)
Net cash (used in)/provided by financing activities	(419,722)	1,370,896	715,978
Net (decrease)/increase in cash	(6,154)	11,612	(315,525)
Cash, cash equivalents and restricted cash at beginning of period	476,104	464,492	780,017
Cash, cash equivalents and restricted cash at end of period	469,950	476,104	464,492
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, including capitalized interest of $43,411, $42,390 and $43,093 at December 31, 2025, 2024 and 2023, respectively	915,815	794,330	693,826
Cash paid for income taxes	59,330	57,433	7,801
Supplemental Disclosure of Noncash Activities
Buyer furnished equipment, capitalized interest and deposits on flight equipment purchases applied to acquisition of flight equipment and other assets	969,210	1,192,974	827,377
Flight equipment subject to operating leases reclassified to flight equipment held for sale	1,230,864	1,821,084	1,730,212
Transfer of flight equipment to investment in sales-type lease	33,778	106,043	66,907
Cash dividends declared on Class A common stock, not yet paid	$ 24,588	$ 24,503	$ 23,316