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REVENUE RECOGNITION - Revenue by Geographic Region (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Operating revenue $ 15,677 $ 15,488 $ 46,084 $ 43,825
Domestic        
Disaggregation of Revenue [Line Items]        
Operating revenue 10,609 10,461 32,216 30,607
Atlantic        
Disaggregation of Revenue [Line Items]        
Operating revenue 3,418 3,497 8,209 8,223
Latin America        
Disaggregation of Revenue [Line Items]        
Operating revenue 889 891 3,432 3,208
Pacific        
Disaggregation of Revenue [Line Items]        
Operating revenue 761 639 2,227 1,787
Passenger        
Disaggregation of Revenue [Line Items]        
Operating revenue 13,107 13,119 38,079 36,735
Passenger | Domestic        
Disaggregation of Revenue [Line Items]        
Operating revenue 8,652 8,662 26,033 25,200
Passenger | Atlantic        
Disaggregation of Revenue [Line Items]        
Operating revenue 3,029 3,110 7,159 7,157
Passenger | Latin America        
Disaggregation of Revenue [Line Items]        
Operating revenue 779 788 3,008 2,846
Passenger | Pacific        
Disaggregation of Revenue [Line Items]        
Operating revenue $ 647 $ 559 $ 1,879 $ 1,532