CONTINGENCIES - Schedule of Employee Base is Represented by Collective Bargaining Agreements (Details)	12 Months Ended
	Dec. 31, 2025 employee
Republic Airways Pilots
Product Liability Contingency [Line Items]
Number of employees covers under collective bargaining agreements	2,490
Mesa Airlines Pilots
Product Liability Contingency [Line Items]
Number of employees covers under collective bargaining agreements	531
Republic Airways Flight Attendants
Product Liability Contingency [Line Items]
Number of employees covers under collective bargaining agreements	2,232
Mesa Airlines Flight Attendants
Product Liability Contingency [Line Items]
Number of employees covers under collective bargaining agreements	567
Republic Airways Dispatchers
Product Liability Contingency [Line Items]
Number of employees covers under collective bargaining agreements	104