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Leases - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) aircraft | Jun. 30, 2023 USD ($) aircraft | Dec. 31, 2023 USD ($) aircraft | Dec. 31, 2022 USD ($) aircraft
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of aircrafts operated |  |  | 32 |  | 42 | 30
Additional variable costs | $ | $ 4,818 | $ 2,759 | $ 8,239 | $ 4,709 | $ 12,689 | $ 13,778
Number of aircrafts purchased |  |  |  |  | 2 |
Number of aircrafts in sale-leaseback transaction |  |  |  | 2 | 10 |
Gain on sale-leaseback | $ |  |  |  | $ 501 | $ 10,223 |
Minimum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lease term | 2 years |  | 2 years |  | 2 years |
Minimum | Charter Flight Services |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lease term | 2 years |  | 2 years |  | 2 years |
Maximum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lease term | 30 years |  | 30 years |  | 30 years |
Maximum | Charter Flight Services |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Lease term | 6 years |  | 6 years |  | 6 years |

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