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Net investment in finance and sales-type leases | 12 Months Ended
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Dec. 31, 2019
Flight Equipment, Net [Abstract] |
Net investment in finance and sales-type leases | Net investment in finance and sales-type leases Components of net investment in finance and sales-type leases as of December 31, 2019 and 2018 were as follows:
| As of December 31,
| 2019 |  | 2018
Future minimum lease payments to be received | $ | 715,085 |  |  | $ | 792,265 |
Estimated residual values of leased flight equipment | 577,353 |  |  | 528,916 |
Less: Unearned income | (280,889 | ) |  | (317,895 | )
| $ | 1,011,549 |  |  | $ | 1,003,286 |
As of December 31, 2019, the cash flows receivable, including the estimated residual value at lease termination, from finance and sales-type leases were as follows:
| Cash flows receivable
2020 | $ | 154,323 |
2021 | 131,054 |
2022 | 202,302 |
2023 | 135,388 |
2024 | 109,098 |
Thereafter | 560,273 |
Undiscounted cash flows receivable | $ | 1,292,438 |
Less: Unearned income | (280,889 | )
| 1,011,549 |
During the year ended December 31, 2019, we recognized impairment charges of $22.0 million related to our finance and sales-type leases where we do not expect to recover the finance lease balances. Impairment charges on our finance and sales-type leases are included in leasing expenses in the Consolidated Income Statement.

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