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Flight equipment subject to operating lease - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 10 Months Ended | 12 Months Ended | 46 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) aircraft | Oct. 31, 2022 USD ($) aircraft | Sep. 30, 2025 USD ($) | Jun. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2022 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Nov. 03, 2025 USD ($) | Dec. 31, 2022 USD ($) | Nov. 03, 2025 USD ($)
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from settlement of insurance claims |  |  |  |  |  |  | $ 727,572 | $ 0 |  |  |
S7 |  |  |  |  |  |  |  |  |  |  |
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of aircrafts subject to insurance policies | aircraft | 4 |  |  |  |  |  |  |  |  |  |
Flight Equipment |  |  |  |  |  |  |  |  |  |  |
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |  |
Write-off of aircrafts |  |  |  |  |  |  |  |  |  | $ 760,100 |
Proceeds from settlement of insurance claims |  |  | $ 59,700 | $ 339,400 | $ 328,500 |  |  |  |  |  |
Write-off of its interests |  |  |  |  |  | $ 791,000 |  |  |  |  |
Benefit recorded related to return of aircraft from Russia |  | $ 30,900 |  |  |  |  |  |  |  |  |
Number of aircrafts returned from Russia | aircraft |  | 1 |  |  |  |  |  |  |  |  |
Flight Equipment | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from settlement of insurance claims |  |  |  |  |  |  |  |  |  |  | $ 823,200
Flight Equipment | C&P Insurers | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from settlement of insurance claims |  |  |  |  |  |  |  |  | $ 727,600 |  |
Flight Equipment | S7 |  |  |  |  |  |  |  |  |  |  |
Property, Plant, and Equipment, Lessor Asset under Operating Lease [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from settlement of insurance claims | $ 64,700 |  |  |  |  |  |  |  |  |  |

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