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REVENUES - Schedule of Disaggregation of Revenue (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2026
USD ($)
aircraft
Mar. 31, 2025
USD ($)
Disaggregation of Revenue [Line Items]    
Revenues [1] $ 527.4 $ 394.8
Regional jet service revenue 438.9 315.7
Lease revenue 79.0 73.6
Other revenue $ 9.5 5.5
American Airlines    
Disaggregation of Revenue [Line Items]    
Number of aircraft leased | aircraft 31  
American Airlines    
Disaggregation of Revenue [Line Items]    
Revenues $ 189.5 171.2
Delta Air Lines    
Disaggregation of Revenue [Line Items]    
Revenues 99.3 99.4
United Airlines    
Disaggregation of Revenue [Line Items]    
Revenues 229.1 118.7
Other    
Disaggregation of Revenue [Line Items]    
Revenues $ 9.5 $ 5.5
[1] Substantially all of the Company’s revenues are derived from related parties during the three months ended March 31, 2026 and 2025. Refer to Note 5, Revenues and Note 10, Related Party Transactions.