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Flight equipment held for operating leases, net
 12 Months Ended
Dec. 31, 2018
Property Subject to or Available for Operating Lease, Net [Abstract]  
Flight equipment held for operating leases, net
Flight equipment held for operating leases, net
Movements in flight equipment held for operating leases during the years ended December 31, 2018 and 2017 were as follows:
 
Year Ended December 31,
 
2018
 
2017
Net book value at beginning of period
$
32,396,827

 
$
31,501,973

Additions
5,877,691

 
5,276,715

Depreciation
(1,649,710
)
 
(1,690,753
)
Disposals and transfers to held for sale
(1,417,825
)
 
(2,281,401
)
Transfers to net investment in finance and sales-type leases/inventory
(115,330
)
 
(352,714
)
Impairment (Note 23)
(39,318
)
 
(54,331
)
Other
—

 
(2,662
)
Net book value at end of period
$
35,052,335

 
$
32,396,827

 
 
 
 
Accumulated depreciation as of December 31, 2018 and 2017, respectively
$
(6,850,869
)
 
$
(6,067,084
)