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Commitments and Contingencies (Details) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 USD ($) aircraft
Future minimum rental payments required under operating leases |
October 2018 through December 2018 | $ 25,327
2019 | 83,268
2020 | 98,790
2021 | 90,378
2022 | 72,438
Thereafter | 125,570
Total future lease obligations | $ 495,771
E 175 |
Future minimum rental payments required under operating leases |
Number of aircraft under firm purchase commitment | aircraft | 11
E 175 | Alaska |
Future minimum rental payments required under operating leases |
Number of additional aircraft placed into service, deferred | aircraft | 3

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