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OPERATING SEGMENT INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2015
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] | Operating segment information is as follows (in millions):
| Alaska |  |  |  |  |  |  |  |  |  |
Year Ended December 31, 2015 | Mainline |  | Regional |  | Horizon |  | Consolidating |  | Air Group Adjusted(a) |  | Special Items(b) |  | Consolidated
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger |  |  |  |  |  |  |  |  |  |  |  |  |
Mainline | $ | 3,939 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 3,939 |  |  | $ | — |  |  | $ | 3,939 |
Regional | — |  |  | 854 |  |  | — |  |  | — |  |  | 854 |  |  | — |  |  | 854 |
Total passenger revenues | 3,939 |  |  | 854 |  |  | — |  |  | — |  |  | 4,793 |  |  | — |  |  | 4,793 |
CPA revenues | — |  |  | — |  |  | 408 |  |  | (408 | ) |  | — |  |  | — |  |  | — |
Freight and mail | 103 |  |  | 5 |  |  | — |  |  | — |  |  | 108 |  |  | — |  |  | 108 |
Other-net | 621 |  |  | 72 |  |  | 4 |  |  | — |  |  | 697 |  |  | — |  |  | 697 |
Total operating revenues | 4,663 |  |  | 931 |  |  | 412 |  |  | (408 | ) |  | 5,598 |  |  | — |  |  | 5,598 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 2,653 |  |  | 695 |  |  | 375 |  |  | (409 | ) |  | 3,314 |  |  | 32 |  |  | 3,346 |
Economic fuel | 823 |  |  | 131 |  |  | — |  |  | — |  |  | 954 |  |  | — |  |  | 954 |
Total operating expenses | 3,476 |  |  | 826 |  |  | 375 |  |  | (409 | ) |  | 4,268 |  |  | 32 |  |  | 4,300 |
Nonoperating income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 19 |  |  | — |  |  | — |  |  | 2 |  |  | 21 |  |  | — |  |  | 21 |
Interest expense | (28 | ) |  | — |  |  | (10 | ) |  | (4 | ) |  | (42 | ) |  | — |  |  | (42 | )
Other | 28 |  |  | — |  |  | 1 |  |  | 6 |  |  | 35 |  |  | — |  |  | 35 |
| 19 |  |  | — |  |  | (9 | ) |  | 4 |  |  | 14 |  |  | — |  |  | 14 |
Income (loss) before income tax | $ | 1,206 |  |  | $ | 105 |  |  | $ | 28 |  |  | $ | 5 |  |  | $ | 1,344 |  |  | $ | (32 | ) |  | $ | 1,312 |
| Alaska |  |  |  |  |  |  |  |  |  |
Year Ended December 31, 2014 | Mainline |  | Regional |  | Horizon |  | Consolidating |  | Air Group Adjusted(a) |  | Special Items(b) |  | Consolidated
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger |  |  |  |  |  |  |  |  |  |  |  |  |
Mainline | $ | 3,774 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 3,774 |  |  | $ | — |  |  | $ | 3,774 |
Regional | — |  |  | 805 |  |  | — |  |  | — |  |  | 805 |  |  | — |  |  | 805 |
Total passenger revenues | 3,774 |  |  | 805 |  |  | — |  |  | — |  |  | 4,579 |  |  | — |  |  | 4,579 |
CPA revenues | — |  |  | — |  |  | 371 |  |  | (371 | ) |  | — |  |  | — |  |  | — |
Freight and mail | 109 |  |  | 5 |  |  | — |  |  |  |  |  | 114 |  |  | — |  |  | 114 |
Other-net | 592 |  |  | 78 |  |  | 5 |  |  |  |  |  | 675 |  |  | — |  |  | 675 |
Total operating revenues | 4,475 |  |  | 888 |  |  | 376 |  |  | (371 | ) |  | 5,368 |  |  | — |  |  | 5,368 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 2,417 |  |  | 623 |  |  | 349 |  |  | (371 | ) |  | 3,018 |  |  | (30 | ) |  | 2,988 |
Economic fuel | 1,251 |  |  | 190 |  |  | — |  |  | — |  |  | 1,441 |  |  | (23 | ) |  | 1,418 |
Total operating expenses | 3,668 |  |  | 813 |  |  | 349 |  |  | (371 | ) |  | 4,459 |  |  | (53 | ) |  | 4,406 |
Nonoperating income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 20 |  |  | — |  |  | — |  |  | 1 |  |  | 21 |  |  | — |  |  | 21 |
Interest expense | (32 | ) |  | — |  |  | (12 | ) |  | (4 | ) |  | (48 | ) |  | — |  |  | (48 | )
Other | 39 |  |  | (1 | ) |  | 2 |  |  | — |  |  | 40 |  |  | — |  |  | 40 |
| 27 |  |  | (1 | ) |  | (10 | ) |  | (3 | ) |  | 13 |  |  | — |  |  | 13 |
Income (loss) before income tax | $ | 834 |  |  | $ | 74 |  |  | $ | 17 |  |  | $ | (3 | ) |  | $ | 922 |  |  | $ | 53 |  |  | $ | 975 |
| Alaska |  |  |  |  |  |  |  |  |  |
Year Ended December 31, 2013 | Mainline |  | Regional |  | Horizon |  | Consolidating |  | Air Group Adjusted(a) |  | Special Items(b) |  | Consolidated
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger |  |  |  |  |  |  |  |  |  |  |  |  |
Mainline | $ | 3,490 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 3,490 |  |  | $ | — |  |  | $ | 3,490 |
Regional | — |  |  | 777 |  |  | — |  |  | — |  |  | 777 |  |  | — |  |  | 777 |
Total passenger revenues | 3,490 |  |  | 777 |  |  | — |  |  | — |  |  | 4,267 |  |  | — |  |  | 4,267 |
CPA revenues | — |  |  | — |  |  | 368 |  |  | (368 | ) |  | — |  |  | — |  |  | — |
Freight and mail | 109 |  |  | 4 |  |  | — |  |  | — |  |  | 113 |  |  | — |  |  | 113 |
Other-net | 513 |  |  | 66 |  |  | 5 |  |  | — |  |  | 584 |  |  | 192 |  |  | 776 |
Total operating revenues | 4,112 |  |  | 847 |  |  | 373 |  |  | (368 | ) |  | 4,964 |  |  | 192 |  |  | 5,156 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 2,293 |  |  | 585 |  |  | 341 |  |  | (368 | ) |  | 2,851 |  |  | — |  |  | 2,851 |
Economic fuel | 1,294 |  |  | 181 |  |  | — |  |  | — |  |  | 1,475 |  |  | (8 | ) |  | 1,467 |
Total operating expenses | 3,587 |  |  | 766 |  |  | 341 |  |  | (368 | ) |  | 4,326 |  |  | (8 | ) |  | 4,318 |
Nonoperating income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 18 |  |  | — |  |  | — |  |  | — |  |  | 18 |  |  | — |  |  | 18 |
Interest expense | (38 | ) |  | — |  |  | (14 | ) |  | (4 | ) |  | (56 | ) |  | — |  |  | (56 | )
Other | 25 |  |  | (12 | ) |  | 2 |  |  | 1 |  |  | 16 |  |  | — |  |  | 16 |
| 5 |  |  | (12 | ) |  | (12 | ) |  | (3 | ) |  | (22 | ) |  | — |  |  | (22 | )
Income (loss) before income tax | $ | 530 |  |  | $ | 69 |  |  | $ | 20 |  |  | $ | (3 | ) |  | $ | 616 |  |  | $ | 200 |  |  | $ | 816 |
(a) | The adjusted column represents the financial information that is reviewed by management to assess performance of operations and determine capital allocations and does not include certain income and charges.
(b) | Includes accounting adjustments related to mark-to-market fuel-hedge accounting charges (all years), pension settlement charge (2015), litigation-related matter (2015), non-cash curtailment gain (2014), a gain related to a legal matter (2014), and Special mileage plan revenue (2013).
| 2015 |  | 2014 |  | 2013
Depreciation: |  |  |  |  |
Alaska(a) | $ | 268 |  |  | 243 |  |  | $ | 223 |
Horizon | 52 |  |  | 51 |  |  | 47 |
Parent company | — |  |  | — |  |  | — |
Consolidated | $ | 320 |  |  | $ | 294 |  |  | $ | 270 |
Capital expenditures: |  |  |  |  |
Alaska(a) | $ | 821 |  |  | $ | 659 |  |  | $ | 494 |
Horizon | 10 |  |  | 35 |  |  | 72 |
Consolidated | $ | 831 |  |  | $ | 694 |  |  | $ | 566 |
Total assets at end of period: |  |  |  |  |  |  |  |
Alaska(a) | $ | 8,129 |  |  | $ | 6,665 |  |  |
Horizon | 718 |  |  | 809 |  |  |
Parent company | 4,734 |  |  | 3,551 |  |  |
Elimination of inter-company accounts | (7,048 | ) |  | (4,961 | ) |  |
Consolidated | $ | 6,533 |  |  | $ | 6,064 |  |  |
(a) | There are no depreciation expenses, capital expenditures or assets associated with purchased capacity flying at Alaska Regional.

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