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Net investment in finance and sales-type leases
 6 Months Ended
Jun. 30, 2020
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 June 30, 2020 and December 31, 2019 were as follows:
June 30, 2020December 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  
During the three months ended June 30, 2020 and 2019, we recognized interest income from net investment in finance and sales-type leases of $13.6 million and $15.8 million, respectively, included in basic lease rents. During the six months ended June 30, 2020 and 2019, we recognized interest income from net investment in finance and sales-type leases of $27.3 million and $31.3 million, respectively, included in basic lease rents.