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Flight equipment subject to operating lease (Tables)
3 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
Flight Equipment Subject to Operating Lease
The following table summarizes the activities for the Company’s flight equipment subject to operating lease for the three months ended March 31, 2022:

(in thousands)
Net book value as of December 31, 2021$22,899,004 
Additions490,888 
Depreciation(235,308)
Transfers to net investments in sales-type leases(79,255)
Write-off of Russian fleet(791,017)
Net book value as of March 31, 2022$22,284,312 
Accumulated depreciation as of March 31, 2022$(4,267,934)