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Commitments and contingencies (Movements in prepayments on flight equipment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]    
Prepayments on flight equipment at beginning of period $ 2,111,659 $ 2,954,478
GECAS Transaction 2,990,414 0
Prepayments and additions during the period, net 136,655 270,032
Interest paid and capitalized during the period 30,827 49,144
Prepayments and capitalized interest applied to the purchase of flight equipment (682,707) (1,161,995)
Prepayments on flight equipment at end of period $ 4,586,848 $ 2,111,659