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Investments in Other Companies (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2025 USD ($) shares | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) item shares | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 shares | Dec. 31, 2022 USD ($) $ / shares shares
Long-term debt |  |  | $ 2,496,570 |  | $ 2,496,570 |  | $ 2,672,375 |  |
Aircraft maintenance, materials, and repairs |  |  | $ 238,885 | $ 183,267 | 447,985 | $ 328,682 |  |  |
Other income (loss) net |  |  |  |  | 2,100 | (7,400) |  |  |
Aero Engines, LLC. ("Aero Engines") |  |  |  |  |  |  |  |  |
Payments to acquire interest in joint venture |  |  |  |  | $ 26,600 |  |  |  |
Investment ownership (as a percent) |  |  | 75.00% |  | 75.00% |  |  |  |
Long-term debt |  |  | $ 0 |  | $ 0 |  |  |  |
Proceeds from equity method investment distribution |  |  |  |  | 12,000 |  |  |  |
Aero Engines, LLC. ("Aero Engines") | Other Assets |  |  |  |  |  |  |  |  |
Investment balance in other companies |  |  | $ 12,100 |  | 12,100 |  | 23,900 |  |
Aero Engines, LLC. ("Aero Engines") | Other expense, net |  |  |  |  |  |  |  |  |
Company's portion of income (loss) generated by other companies |  |  |  |  | $ 100 |  |  |  |
Contour Airlines |  |  |  |  |  |  |  |  |
Investment ownership (as a percent) |  | 9.90% | 25.00% |  | 25.00% |  |  | 9.90% |
Payments to acquire equity method investment | $ 15,100 | $ 9,900 |  |  |  |  |  |  |
Number of Board of Directors seats held | item |  |  |  |  | 1 |  |  |  |
Total number of Board of Directors seats | item |  |  |  |  | 5 |  |  |  |
Percentage of Board of Directors seats held |  |  | 20.00% |  | 20.00% |  |  |  |
Aircraft maintenance, materials, and repairs |  |  |  |  | $ 8,500 |  |  |  |
Aircraft and collectible years |  |  |  |  | 4 years |  |  |  |
Contour Airlines | Other Assets |  |  |  |  |  |  |  |  |
Investment balance in other companies |  |  | $ 22,200 |  | $ 22,200 |  |  |  |
Contour Airlines | Other expense, net |  |  |  |  |  |  |  |  |
Company's portion of income (loss) generated by other companies |  |  |  |  | $ 700 |  |  |  |
Eve Holdings, Inc. ("Eve") |  |  |  |  |  |  |  |  |
Warrants to purchase shares | shares |  |  | 1,500,000 |  | 1,500,000 |  |  |  | 1,500,000
Warrants exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 0.01
Initial investment |  |  |  |  |  |  |  |  | $ 10,000
Realized loss |  |  |  |  |  | 1,400 |  |  |
Realized gain (loss) on exercise of put options |  |  |  |  |  | $ 3,400 |  |  |
Eve Holdings, Inc. ("Eve") | Level 3 |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | $ 8,160 |  |  |  |
Unrealized gain |  |  |  |  | $ 2,130 |  |  |  |
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  | Other Nonoperating Income (Expense) |  |  |  |
Ending balance |  |  | $ 10,290 |  | $ 10,290 |  | $ 8,160 |  |
Eve Holdings, Inc. ("Eve") | Put option |  |  |  |  |  |  |  |  |
Shares obtained | shares |  |  |  |  |  |  |  |  | 1,000,000
Shares sold | shares |  |  |  |  |  |  | 399,589 | 600,411 |
Shares forfeited | shares |  |  |  |  |  |  |  | 600,411 |
Eve Holdings, Inc. ("Eve") | Other Assets |  |  |  |  |  |  |  |  |
Investment balance in other companies |  |  | $ 10,300 |  | $ 10,300 |  | $ 8,200 |  |
Eve Holdings, Inc. ("Eve") | Class A common stock |  |  |  |  |  |  |  |  |
Number of shares acquired | shares |  |  |  |  |  |  |  |  | 1,000,000

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