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OPERATING SEGMENT INFORMATION (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) segment | Sep. 30, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of Operating Segments | segment |  |  | 3 |
Capacity purchase arrangements | 100.00% |  | 100.00% |
Operating revenues |  |  |  |
Passenger, Mainline | $ 1,562 | $ 1,073 | $ 4,390 | $ 3,036
Passenger, Regional | 262 | 249 | 725 | 682
Total passenger revenue | 1,824 | 1,322 | 5,115 | 3,718
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 32 | 31 | 88 | 82
Other - net revenue | 264 | 213 | 768 | 607
Total Operating Revenues | 2,120 | 1,566 | 5,971 | 4,407
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,313 | 941 | 3,822 | 2,706
Economic fuel | 368 | 225 | 1,051 | 593
Total Operating Expenses | 1,681 | 1,166 | 4,873 | 3,299
Nonoperating Income (Expense) |  |  |  |
Interest income | 9 | 7 | 25 | 20
Interest expense | (26) | (11) | (77) | (33)
Other | 5 | 6 | 12 | 19
Nonoperating Income (Expense) Total | (12) | 2 | (40) | 6
Income (loss) before income tax | 427 | 402 | 1,058 | 1,114
Air Group Adjusted [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 1,562 | 1,073 | 4,390 | 3,036
Passenger, Regional | 262 | 249 | 725 | 682
Total passenger revenue | 1,824 | 1,322 | 5,115 | 3,718
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 32 | 31 | 88 | 82
Other - net revenue | 264 | 213 | 768 | 607
Total Operating Revenues | 2,120 | 1,566 | 5,971 | 4,407
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,289 | 919 | 3,734 | 2,670
Economic fuel | 373 | 222 | 1,044 | 602
Total Operating Expenses | 1,662 | 1,141 | 4,778 | 3,272
Nonoperating Income (Expense) |  |  |  |
Interest income | 9 | 7 | 25 | 20
Interest expense | (26) | (11) | (77) | (33)
Other | 5 | 6 | 12 | 19
Nonoperating Income (Expense) Total | (12) | 2 | (40) | 6
Income (loss) before income tax | 446 | 427 | 1,153 | 1,141
Alaska Mainline [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 1,562 | 1,073 | 4,390 | 3,036
Passenger, Regional | 0 | 0 | 0 | 0
Total passenger revenue | 1,562 | 1,073 | 4,390 | 3,036
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 30 | 30 | 84 | 79
Other - net revenue | 242 | 190 | 708 | 546
Total Operating Revenues | 1,834 | 1,293 | 5,182 | 3,661
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 1,077 | 727 | 3,101 | 2,107
Economic fuel | 328 | 188 | 924 | 512
Total Operating Expenses | 1,405 | 915 | 4,025 | 2,619
Nonoperating Income (Expense) |  |  |  |
Interest income | 11 | 7 | 27 | 19
Interest expense | (23) | (7) | (68) | (23)
Other | 5 | 5 | 11 | 15
Nonoperating Income (Expense) Total | (7) | 5 | (30) | 11
Income (loss) before income tax | 422 | 383 | 1,127 | 1,053
Alaska Regional [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 0 | 0 | 0 | 0
Passenger, Regional | 262 | 249 | 725 | 682
Total passenger revenue | 262 | 249 | 725 | 682
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 1 | 1 | 3 | 3
Other - net revenue | 21 | 21 | 57 | 57
Total Operating Revenues | 284 | 271 | 785 | 742
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 219 | 202 | 625 | 580
Economic fuel | 45 | 34 | 120 | 90
Total Operating Expenses | 264 | 236 | 745 | 670
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | 0 | 0 | 0 | 0
Other | 0 | 0 | 0 | 0
Nonoperating Income (Expense) Total | 0 | 0 | 0 | 0
Income (loss) before income tax | 20 | 35 | 40 | 72
Horizon [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 0 | 0 | 0 | 0
Passenger, Regional | 0 | 0 | 0 | 0
Total passenger revenue | 0 | 0 | 0 | 0
CPA revenues | 112 | 109 | 317 | 322
Freight and mail | 1 | 0 | 1 | 0
Other - net revenue | 1 | 1 | 3 | 3
Total Operating Revenues | 114 | 110 | 321 | 325
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 105 | 99 | 324 | 305
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | 105 | 99 | 324 | 305
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 1
Interest expense | (4) | (2) | (9) | (7)
Other | 0 | 0 | 1 | 0
Nonoperating Income (Expense) Total | (4) | (2) | (8) | (6)
Income (loss) before income tax | 5 | 9 | (11) | 14
Intersegment Elimination [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 0 | 0 | 0 | 0
Passenger, Regional | 0 | 0 | 0 | 0
Total passenger revenue | 0 | 0 | 0 | 0
CPA revenues | (112) | (109) | (317) | (322)
Freight and mail | 0 | 0 | 0 | 0
Other - net revenue | 0 | 1 | 0 | 1
Total Operating Revenues | (112) | (108) | (317) | (321)
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | (112) | (109) | (316) | (322)
Economic fuel | 0 | 0 | 0 | 0
Total Operating Expenses | (112) | (109) | (316) | (322)
Nonoperating Income (Expense) |  |  |  |
Interest income | (2) | 0 | (2) | 0
Interest expense | 1 | (2) | 0 | (3)
Other | 0 | 1 | 0 | 4
Nonoperating Income (Expense) Total | (1) | (1) | (2) | 1
Income (loss) before income tax | (1) | 0 | (3) | 2
Special Revenue and Charges [Member] |  |  |  |
Operating revenues |  |  |  |
Passenger, Mainline | 0 | 0 | 0 | 0
Passenger, Regional | 0 | 0 | 0 | 0
Total passenger revenue | 0 | 0 | 0 | 0
CPA revenues | 0 | 0 | 0 | 0
Freight and mail | 0 | 0 | 0 | 0
Other - net revenue | 0 | 0 | 0 | 0
Total Operating Revenues | 0 | 0 | 0 | 0
Operating expenses |  |  |  |
Operating Expenses, Excluding Fuel | 24 | 22 | 88 | 36
Economic fuel | (5) | 3 | 7 | (9)
Total Operating Expenses | 19 | 25 | 95 | 27
Nonoperating Income (Expense) |  |  |  |
Interest income | 0 | 0 | 0 | 0
Interest expense | 0 | 0 | 0 | 0
Other | 0 | 0 | 0 | 0
Nonoperating Income (Expense) Total | 0 | 0 | 0 | 0
Income (loss) before income tax | $ (19) | $ (25) | $ (95) | $ (27)

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