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Commitments and contingencies (Tables)
6 Months Ended
Jun. 30, 2019
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, 2019 and 2018 were as follows:
 
Six Months Ended June 30,
 
2019
 
2018
Prepayments on flight equipment at beginning of period
$
3,024,520

 
$
2,930,303

Prepayments during the period
522,887

 
828,244

Interest paid and capitalized during the period
53,905

 
46,582

Prepayments and capitalized interest applied to the purchase of flight equipment
(639,945
)
 
(642,443
)
Prepayments on flight equipment at end of period
$
2,961,367

 
$
3,162,686