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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 0 Months Ended
--- | --- | ---
Jun. 30, 2013 aircraft | May 21, 2013 E175 Embraer S. A agreement aircraft
Commitments and Contingencies |  |
Number of aircraft to be purchased |  | 100
Number of aircraft delivered |  | 40
Number of aircraft to be acquired on condition |  | 60
Number of aircraft leased by the entity | 575 |
Future minimum rental payments required under operating leases |  |
July through December 2013 | $ 174,682 |
2014 | 378,877 |
2015 | 325,540 |
2016 | 254,928 |
2017 | 192,602 |
Thereafter | 720,718 |
Total | 2,047,347 |
Commitments for the acquisition of aircraft and related spare engines |  |
2014 | 569,640 |
2015 | 591,368 |
2016 | 9,972 |
Total | $ 1,170,980 |

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