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Flight equipment held for sale (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) aircraft | Jun. 30, 2019 USD ($) aircraft
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of aircraft held for sale | aircraft | 7 |
Net book value of flight equipment held for sale | $ | $ 184,129 | $ 507,949
Number of aircraft sold | aircraft | 6 |
Flight Equipment Held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of aircraft held for sale | aircraft |  | 19
Net book value of flight equipment held for sale | $ |  | $ 507,900
Maintenance and security deposit received from the lessee to be assumed by the buyers of the aircraft | $ |  | $ 117,000

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