CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities
Net income/(loss)	$ 427,704	$ 614,622	$ (97,024)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Depreciation of flight equipment	1,143,761	1,068,772	965,955
Write-off of Russian fleet, net of (recoveries)	0	(67,022)	771,476
Stock-based compensation expense	33,887	34,615	15,603
Deferred taxes	63,021	133,358	(43,492)
Amortization of prepaid lease costs	101,800	75,389	47,849
Amortization of discounts and debt issuance costs	54,823	54,053	53,254
Gain on aircraft sales, trading and other activity	(228,466)	(226,945)	(113,103)
Changes in operating assets and liabilities:
Other assets	12,521	48,310	(232,613)
Accrued interest and other payables	75,172	13,333	255
Rentals received in advance	(7,204)	(1,605)	13,990
Net cash provided by operating activities	1,677,019	1,746,880	1,382,150
Investing Activities
Acquisition of flight equipment	(3,727,416)	(3,789,113)	(2,904,723)
Payments for deposits on flight equipment purchases	(446,343)	(433,452)	(518,270)
Proceeds from aircraft sales, trading and other activity	1,524,711	1,684,814	235,424
Proceeds from settlement of insurance claim	0	64,714	0
Acquisition of aircraft furnishings, equipment and other assets	(387,255)	(305,346)	(216,635)
Net cash used in investing activities	(3,036,303)	(2,778,383)	(3,404,204)
Financing Activities
Net proceeds from preferred stock issuance	295,012	0	0
Redemption of preferred stock	(250,000)	0	0
Cash dividends paid on Class A common stock	(93,481)	(88,792)	(83,253)
Common shares repurchased	0	0	(150,000)
Cash dividends paid on preferred stock	(47,762)	(41,700)	(41,700)
Tax withholdings on stock-based compensation	(9,387)	(3,354)	(8,903)
Net change in unsecured revolving facility	(930,000)	80,000	1,020,000
Proceeds from debt financings	5,201,695	2,993,732	2,659,996
Payments in reduction of debt financings	(3,210,028)	(2,593,338)	(2,085,898)
Debt issuance costs	(10,277)	(13,052)	(6,827)
Security deposits and maintenance reserve receipts	452,022	398,345	417,224
Security deposits and maintenance reserve disbursements	(26,898)	(15,863)	(26,860)
Net cash provided by financing activities	1,370,896	715,978	1,693,779
Net increase/(decrease) in cash	11,612	(315,525)	(328,275)
Cash, cash equivalents and restricted cash at beginning of period	464,492	780,017	1,108,292
Cash, cash equivalents and restricted cash at end of period	476,104	464,492	780,017
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, including capitalized interest of $42,390, $43,093 and $39,655 at December 31, 2024, 2023 and 2022, respectively	794,330	693,826	533,897
Cash paid for income taxes	57,433	7,801	6,362
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	1,192,974	827,377	914,501
Flight equipment subject to operating leases reclassified to flight equipment held for sale	1,821,084	1,730,212	377,131
Transfer of flight equipment to investment in sales-type lease	106,043	66,907	255,205
Cash dividends declared on Class A common stock, not yet paid	$ 24,503	$ 23,316	$ 22,178