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Investment in finance and sales-type leases, net
 12 Months Ended
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,
20202019
Future minimum lease payments to be received$608,950 $715,085 
Estimated residual values of leased flight equipment589,872 577,353 
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 
2022207,102 
2023140,188 
2024113,698 
2025141,267 
Thereafter451,055 
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.