v3.25.2
AIRCRAFT - Aircraft Fleet (Details) - aircraft
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Movement in Property, Plant and Equipment [Roll Forward]    
Balance at beginning of period 63 60
Additions 7 3
Reclassifications 0 0
Removals (1) 0
Balance at end of period 69 63
Passenger    
Movement in Property, Plant and Equipment [Roll Forward]    
Balance at beginning of period 45 42
Additions 0 2
Reclassifications 1 0
Removals (1) 0
Balance at end of period 45 44
Passenger | Owned    
Movement in Property, Plant and Equipment [Roll Forward]    
Balance at beginning of period 34 29
Additions 0 1
Reclassifications 1 1
Removals (1) 0
Balance at end of period 34 31
Passenger | Finance leases    
Movement in Property, Plant and Equipment [Roll Forward]    
Balance at beginning of period 11 13
Additions 0 1
Reclassifications 0 (1)
Removals 0 0
Balance at end of period 11 13
Cargo | Aircrafts Operated For Amazon    
Movement in Property, Plant and Equipment [Roll Forward]    
Balance at beginning of period 12 12
Additions 7 0
Reclassifications 0 0
Removals 0 0
Balance at end of period 19 12
Other Property | Owned Aircraft Held for Operating Lease    
Movement in Property, Plant and Equipment [Roll Forward]    
Balance at beginning of period 4  
Additions 0  
Reclassifications (1)  
Removals 0  
Balance at end of period 3  
Other Property | Owned Aircraft Held for Operating Lease    
Movement in Property, Plant and Equipment [Roll Forward]    
Balance at beginning of period   5
Additions   0
Reclassifications   0
Removals   0
Balance at end of period   5
Other Property | Subleased Aircraft    
Movement in Property, Plant and Equipment [Roll Forward]    
Balance at beginning of period 2 1
Additions 0 1
Reclassifications 0 0
Removals 0 0
Balance at end of period 2 2