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Net investment in finance and sales-type leases (Tables) | 6 Months Ended
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Jun. 30, 2020
Flight Equipment, Net [Abstract] |
Schedule of components of net investment in finance and sales-type leases | Components of net investment in finance and sales-type leases as of June 30, 2020 and December 31, 2019 were as follows:
| June 30, 2020 |  | December 31, 2019
Future minimum lease payments to be received | $ | 667,765 |  |  | $ | 715,085 |
Estimated residual values of leased flight equipment | 588,791 |  |  | 577,353 |
Less: Unearned income | (257,270) |  |  | (280,889) |
Allowance for credit losses | (56,273) |  |  | — |
| $ | 943,013 |  |  | $ | 1,011,549 |

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