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Investments in Other Companies (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2025
USD ($)
shares
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
item
shares
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Investments in other companies                  
Long-term debt     $ 2,384,794   $ 2,384,794   $ 2,672,375    
Aircraft maintenance, materials, and repairs     $ 247,978 $ 181,652 695,963 $ 510,334      
Unrealized losses           (8,600)      
Other income (loss) net         2,400 6,600      
Aero Engines, LLC. ("Aero Engines")                  
Investments in other companies                  
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                  
Investments in other companies                  
Investment balance in other companies     $ 12,500   12,500   23,900    
Aero Engines, LLC. ("Aero Engines") | Other expense, net                  
Investments in other companies                  
Company's portion of income (loss) generated by other companies         $ 600        
Contour Airlines                  
Investments in other companies                  
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         $ 8,700        
Aircraft and collectible years         4 years        
Contour Airlines | Other Assets                  
Investments in other companies                  
Investment balance in other companies     $ 22,800   $ 22,800        
Contour Airlines | Other expense, net                  
Investments in other companies                  
Company's portion of income (loss) generated by other companies         $ 1,400        
Eve Holding, Inc                  
Investments in other companies                  
Warrants to purchase shares | shares     1,500,000   1,500,000       1,500,000
Issuance of common stock upon warrant exercise | shares     1,497,635            
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 Holding, Inc | Level 3                  
Investments in other companies                  
Beginning balance         $ 8,160        
Unrealized loss         $ (2,445)        
Fair value, net derivative asset (liability), recurring basis, still held, unrealized gain, statement of income or comprehensive income [extensible enumeration]         Other Nonoperating Income (Expense)        
Exercise of warrant to common stock (level 1)         $ (5,715)        
Ending balance             $ 8,160    
Eve Holding, Inc | Put option                  
Investments in other companies                  
Shares obtained | shares                 1,000,000
Shares sold | shares             399,589 600,411  
Shares forfeited | shares               600,411  
Eve Holding, Inc | Other Assets                  
Investments in other companies                  
Investment balance in other companies     $ 5,700   $ 5,700   $ 8,200    
Eve Holding, Inc | Class A common stock                  
Investments in other companies                  
Number of shares acquired | shares                 1,000,000