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Commitments and contingencies (Tables)
6 Months Ended
Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
Schedule of movements in prepayments on flight equipment
Movements in prepayments on flight equipment during the six months ended June 30, 2020 and 2019 were as follows:
Six Months Ended June 30,
20202019
Prepayments on flight equipment at beginning of period$2,954,478  $3,024,520  
Prepayments during the period685,051  522,887  
Interest paid and capitalized during the period31,830  53,905  
Prepayments and capitalized interest applied to the purchase of flight equipment(301,263) (639,945) 
Prepayments on flight equipment at end of period$3,370,096  $2,961,367