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OPERATING SEGMENT INFORMATION (Tables) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting [Abstract]        
Schedule of Segment Reporting Information, by Segment     Operating segment information is as follows (in millions):
Three Months Ended June 30, 2022
MainlineRegionalHorizon
Consolidating & Other(a)
Air Group Adjusted(b)
Special Items(c)
Consolidated
Operating Revenues   
Passenger revenues$2,028 $390 $— $— $2,418 $— $2,418 
CPA revenues— — 101 (101)— — — 
Mileage Plan other revenue159 16 — — 175 — 175 
Cargo and other64 — — 1 65 — 65 
Total Operating Revenues2,251 406 101 (100)2,658 — 2,658 
Operating Expenses
Operating expenses, excluding fuel1,262 289 98 (100)1,549 146 1,695 
Fuel expense617 119 — — 736 40 776 
Total Operating Expenses1,879 408 98 (100)2,285 186 2,471 
Non-operating Income (Expense)3 — (5)— (2)— (2)
Income (Loss) Before Income Tax$375 $(2)$(2)$— $371 $(186)$185 
Pretax Margin14.0 %7.0 %
Three Months Ended June 30, 2021
MainlineRegionalHorizon
Consolidating & Other(a)
Air Group Adjusted(b)
Special Items(c)
Consolidated
Operating Revenues
Passenger revenues$1,072 $280 $— $— $1,352 $— $1,352 
CPA revenues— — 111 (111)— — — 
Mileage Plan other revenue102 16 — — 118 — 118 
Cargo and other55 — — 2 57 — 57 
Total Operating Revenues1,229 296 111 (109)1,527 — 1,527 
Operating Expenses
Operating expenses, excluding fuel984 286 91 (127)1,234 (530)704 
Fuel expense253 66 — 1 320 (46)274 
Total Operating Expenses1,237 352 91 (126)1,554 (576)978 
Non-operating Income (Expense)(16)— (5)— (21)— (21)
Income (Loss) Before Income Tax$(24)$(56)$15 $17 $(48)$576 $528 
Pretax Margin(3.1)%34.6 %
  
Nonoperating Income (Expense) $ (2) $ (21) $ (6) $ (33)
Interest income 11 6 18 13
Operating Expenses, Excluding Fuel 1,695 704 3,231 1,459
Economic fuel 776 274 1,123 477
Operating Expenses 2,471 978 4,354 1,936
Income (Loss) Before Income Tax $ 185 $ 528 $ (21) $ 355
Pretax Margin, GAAP 7.00% 34.60% (0.50%) 15.30%
Pretax Margin, Adjusted 14.00% (3.10%) 3.10% (26.90%)