Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Commitments and contingencies (Movements in prepayments on flight equipment) (Details)

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Commitments and contingencies (Movements in prepayments on flight equipment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Deposits on Flight Equipment [Roll Forward]    
Prepayments on flight equipment at beginning of period $ 3,024,520 $ 2,930,303
Prepayments made during the period 1,329,110 1,811,917
Interest paid and capitalized during the period 97,327 101,755
Prepayments and capitalized interest applied to the purchase of flight equipment (1,496,479) (1,819,455)
Prepayments on flight equipment at end of period $ 2,954,478 $ 3,024,520