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Accrued maintenance liability (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Maintenance Liability [Roll Forward]    
Accrued maintenance liability at beginning of period $ 2,503,202 $ 2,900,651
Maintenance payments received 378,292 353,522
Maintenance payments returned (109,522) (172,570)
Release to income other than upon sale (145,006) (698,429)
Lessor contribution , top-ups and other 6,559 (53,627)
Accrued maintenance liability at end of period 2,567,107 2,315,468
Non-cash investing and financing activities    
Maintenance Liability [Roll Forward]    
Release to income upon sale $ (66,418) $ (14,079)