v3.26.1
MERGER WITH MESA AIR GROUP, INC. - Schedule of Purchase Price Consideration (Details)
$ / shares in Units, $ in Millions
Nov. 25, 2025
USD ($)
$ / shares
shares
Jun. 30, 2026
shares
Dec. 31, 2025
shares
Nov. 24, 2025
shares
Business Combination [Line Items]        
Common stock, shares outstanding (in shares)   45,892,239 45,713,286  
Republic Airways Holdings Inc.        
Business Combination [Line Items]        
Common stock, shares outstanding (in shares) 46,949,601      
Exchange Ratio 38.9933      
Price per share at fair value (in dollars per share) | $ / shares $ 21.00      
Implied enterprise value | $ $ 985.9      
Equity Merger consideration at fair value | $ 117.5      
Other consideration at fair value | $ 2.7      
Total Merger consideration | $ $ 120.2      
Republic Airways Holdings Inc. | Mesa Air Group, Inc.        
Business Combination [Line Items]        
Common stock, shares outstanding (in shares) 2,853,542     2,792,531
Resulting shares of Mesa common stock issued for Republic shares outstanding (in shares) 39,978,395      
Shares of common stock of Mesa before the application of the Three Party Agreement (in shares) 44,096,147      
Mesa common stock issued in accordance with the Three Party Agreement (6% of the total Mesa shares of common stock at closing of the Merger) (in shares) 2,853,454      
Escrow shares held, percent 6.00%      
Republic Airways Holdings Inc. | Mesa Air Group, Inc. | Restricted Stock Units        
Business Combination [Line Items]        
Shares issued in period (in shares) 61,011      
Republic Airways Holdings Inc. | Legacy Republic        
Business Combination [Line Items]        
Common stock, shares outstanding (in shares) 1,025,264     1,004,108
Republic equity relinquished 11.90%      
Republic Airways Holdings Inc. | Legacy Republic | Restricted Stock        
Business Combination [Line Items]        
Shares issued in period (in shares) 1,264,210      
Republic Airways Holdings Inc. | Legacy Republic | Restricted Stock Units        
Business Combination [Line Items]        
Shares issued in period (in shares) 21,156