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LEASES - Narrative (Details)
 1 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2025
aircraft
Mar. 31, 2025
USD ($)
aircraft
Dec. 31, 2024
USD ($)
aircraft
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
aircraft
Dec. 31, 2022
USD ($)
aircraft
Jan. 31, 2025
aircraft
Sep. 30, 2023
aircraft
Dec. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
aircraft
airframe
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Lessee, Lease, Description [Line Items]                          
Gain on sale-leaseback transactions                     $ 92,000,000 $ 0 $ 0
Operating lease right-of-use assets     $ 1,369,000,000             $ 1,223,000,000 1,369,000,000 1,223,000,000  
Operating lease, liability     1,359,000,000               1,359,000,000    
Capital expenditures                     2,054,000,000 3,520,000,000 3,924,000,000
Payments of long-term debt and finance lease obligations                     1,337,000,000 85,000,000 2,437,000,000
Total lease obligations     91,000,000             104,000,000 91,000,000 104,000,000  
Aircraft                          
Lessee, Lease, Description [Line Items]                          
Capital expenditures                     45,000,000    
Payments of long-term debt and finance lease obligations                     3,000,000    
Payments of long-term debt and operating lease obligations                     2,000,000    
Total lease obligations     $ 40,000,000               40,000,000    
Gain (loss) on termination of lease                     $ 0    
Number of leased aircrafts, operating lease | aircraft     88               88    
Number of leased aircrafts, finance lease | aircraft     18               18    
Aircraft | Subsequent Event                          
Lessee, Lease, Description [Line Items]                          
Number of aircraft sale agreements | aircraft               36          
Aircraft | Boeing 737-800                          
Lessee, Lease, Description [Line Items]                          
Number of aircraft sale agreements | aircraft     36                    
Number of aircrafts sold | aircraft     35                    
Proceeds from sale of property, plant, and equipment     $ 871,000,000                    
Number of aircrafts de-recognized | aircraft     35                    
Gain on sale-leaseback transactions     $ 92,000,000                    
Operating lease right-of-use assets     319,000,000               $ 319,000,000    
Operating lease, liability     $ 319,000,000               $ 319,000,000    
Number of aircraft purchase agreements | aircraft                     1    
Number of airframe purchase agreements | airframe                     1    
Aircraft | Boeing 737-800 | Subsequent Event                          
Lessee, Lease, Description [Line Items]                          
Number of aircrafts sold | aircraft 1 1                      
Proceeds from sale of property, plant, and equipment   $ 24,000,000                      
Sale leaseback transaction, lease term (in years)   3 years                      
Gain on sale-leaseback transactions   $ 3,000,000                      
Aircraft | Boeing 737-700                          
Lessee, Lease, Description [Line Items]                          
Number of aircraft purchase agreements | aircraft             39   4   2    
Capital expenditures           $ 88,000,000 $ 365,000,000     44,000,000      
Payments of long-term debt and finance lease obligations           50,000,000 191,000,000     3,000,000      
Total lease obligations           38,000,000 174,000,000     $ 41,000,000   $ 41,000,000 $ 174,000,000
Gain (loss) on termination of lease       $ 0 $ 0 $ 0 $ 0            
Number of aircrafts purchased | aircraft           8 31            
Airport-Related                          
Lessee, Lease, Description [Line Items]                          
Term of lease contract (in years)     36 years               36 years    
Maximum | Aircraft                          
Lessee, Lease, Description [Line Items]                          
Term of contract (in years)                     9 years    
Renewal term (in years)                     3 years    
Maximum | Aircraft | Boeing 737-800                          
Lessee, Lease, Description [Line Items]                          
Sale leaseback transaction, lease term (in years)     3 years                    
Maximum | Airport-Related                          
Lessee, Lease, Description [Line Items]                          
Renewal term (in years)     11 years               11 years    
Maximum | Other                          
Lessee, Lease, Description [Line Items]                          
Term of contract (in years)                     4 years    
Renewal term (in years)                     1 year    
Minimum | Aircraft                          
Lessee, Lease, Description [Line Items]                          
Renewal term (in years)                     3 months    
Minimum | Aircraft | Boeing 737-800                          
Lessee, Lease, Description [Line Items]                          
Sale leaseback transaction, lease term (in years)     2 years                    
Minimum | Airport-Related                          
Lessee, Lease, Description [Line Items]                          
Renewal term (in years)     1 year               1 year    
Minimum | Other                          
Lessee, Lease, Description [Line Items]                          
Renewal term (in years)                     6 months