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Investment in finance and sales-type leases, net | 12 Months Ended
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Dec. 31, 2020
Flight Equipment, Net [Abstract] |
Investment in finance and sales-type leases, net | Investment in finance and sales-type leases, net Components of investment in finance and sales-type leases, net as of December 31, 2020 and 2019 were as follows:
| As of December 31,
| 2020 |  | 2019
Future minimum lease payments to be received | $ | 608,950 |  |  | $ | 715,085 |
Estimated residual values of leased flight equipment | 589,872 |  |  | 577,353 |
Less: Unearned income | (260,708) |  |  | (280,889) |
Allowance for credit losses (Note 23) | (59,663) |  |  | — |
| $ | 878,451 |  |  | $ | 1,011,549 |
As of December 31, 2020, the cash flows receivable, including the estimated residual value at lease termination, from finance and sales-type leases were as follows:
| Cash flows receivable
2021 | $ | 145,512 |
2022 | 207,102 |
2023 | 140,188 |
2024 | 113,698 |
2025 | 141,267 |
Thereafter | 451,055 |
Undiscounted cash flows receivable | $ | 1,198,822 |
Less: Unearned income | (260,708) |
Allowance for credit losses | (59,663) |
| $ | 878,451 |
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. During the year ended December 31, 2020 and 2019, we recognized interest income from investment in finance and sales-type leases, net of $54.1 million and $60.0 million, respectively, included in basic lease rents.

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