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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of movements in prepayments on flight equipment
Movements in prepayments on flight equipment during the years ended December 31, 2018 and 2017 were as follows:
 
Year Ended December 31,
 
2018
 
2017
Prepayments on flight equipment at beginning of period
$
2,930,303

 
$
3,265,979

Prepayments made during the period
1,811,917

 
1,162,884

Interest paid and capitalized during the period
101,755

 
107,364

Prepayments and capitalized interest applied to the purchase of flight equipment
(1,819,455
)
 
(1,605,924
)
Prepayments on flight equipment at end of period
$
3,024,520

 
$
2,930,303

Schedule of unrecorded contractual commitments for purchase of fight equipment
The following table presents our contractual commitments for the purchase of flight equipment as of December 31, 2018:
 
2019
 
2020
 
2021
 
2022
 
2023
 
Total
Purchase obligations (a)
$
5,480,353

 
$
4,806,447

 
$
3,942,505

 
$
2,529,114

 
$
1,704,900

 
$
18,463,319

 
(a)
Includes commitments to purchase 354 aircraft and nine purchase and leaseback transactions.
Schedule of minimum payments under lease agreements
As of December 31, 2018, future minimum lease payment obligations under operating and finance lease agreements were as follows:
 
Operating leases (a)
 
Finance leases (b)
2019
$
9,181

 
$
2,359

2020
9,305

 
2,515

2021
9,201

 
2,681

2022
9,262

 
2,857

2023
9,337

 
3,046

Thereafter
35,243

 
105,327

 
$
81,529

 
$
118,785



(a)
Represents contractual payments on our office and facility leases.
(b)
Finance lease obligations are recorded in other secured debt.