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OPERATING SEGMENT INFORMATION (Tables) | 6 Months Ended
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Jun. 30, 2018
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment | Operating segment information is as follows (in millions):
| Three Months Ended June 30, 2018
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenues | $ | 1,711 |  |  | $ | 286 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,997 |  |  | $ | — |  |  | $ | 1,997 |
CPA revenues | — |  |  | — |  |  | 137 |  |  | (137 | ) |  | — |  |  | — |  |  | — |
Mileage plan other revenue | 99 |  |  | 9 |  |  | — |  |  | — |  |  | 108 |  |  | — |  |  | 108 |
Cargo and other | 49 |  |  | 1 |  |  | 1 |  |  | — |  |  | 51 |  |  | — |  |  | 51 |
Total operating revenues | 1,859 |  |  | 296 |  |  | 138 |  |  | (137 | ) |  | 2,156 |  |  | — |  |  | 2,156 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 1,135 |  |  | 249 |  |  | 123 |  |  | (136 | ) |  | 1,371 |  |  | 39 |  |  | 1,410 |
Economic fuel | 432 |  |  | 65 |  |  | — |  |  | — |  |  | 497 |  |  | (22 | ) |  | 475 |
Total operating expenses | 1,567 |  |  | 314 |  |  | 123 |  |  | (136 | ) |  | 1,868 |  |  | 17 |  |  | 1,885 |
Nonoperating income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 13 |  |  | — |  |  | — |  |  | (3 | ) |  | 10 |  |  | — |  |  | 10 |
Interest expense | (22 | ) |  | — |  |  | (5 | ) |  | 2 |  |  | (25 | ) |  | — |  |  | (25 | )
Interest capitalized | 4 |  |  | — |  |  | — |  |  | — |  |  | 4 |  |  | — |  |  | 4 |
Other—net | 1 |  |  | (2 | ) |  | — |  |  | — |  |  | (1 | ) |  | — |  |  | (1 | )
Total Nonoperating income (expense) | (4 | ) |  | (2 | ) |  | (5 | ) |  | (1 | ) |  | (12 | ) |  | — |  |  | (12 | )
Income (loss) before income tax | $ | 288 |  |  | $ | (20 | ) |  | $ | 10 |  |  | $ | (2 | ) |  | $ | 276 |  |  | $ | (17 | ) |  | $ | 259 |
| Three Months Ended June 30, 2017(d)
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenues | $ | 1,677 |  |  | $ | 268 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,945 |  |  | $ | — |  |  | $ | 1,945 |
CPA revenues | — |  |  | — |  |  | 108 |  |  | (108 | ) |  | — |  |  | — |  |  | — |
Mileage plan other revenue | 101 |  |  | 8 |  |  | — |  |  | — |  |  | 109 |  |  | — |  |  | 109 |
Cargo and other | 45 |  |  | 2 |  |  | 1 |  |  | — |  |  | 48 |  |  | — |  |  | 48 |
Total operating revenues | 1,823 |  |  | 278 |  |  | 109 |  |  | (108 | ) |  | 2,102 |  |  | — |  |  | 2,102 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 1,030 |  |  | 206 |  |  | 116 |  |  | (105 | ) |  | 1,247 |  |  | 24 |  |  | 1,271 |
Economic fuel | 304 |  |  | 38 |  |  | — |  |  | — |  |  | 342 |  |  | 2 |  |  | 344 |
Total operating expenses | 1,334 |  |  | 244 |  |  | 116 |  |  | (105 | ) |  | 1,589 |  |  | 26 |  |  | 1,615 |
Nonoperating income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 10 |  |  | — |  |  | — |  |  | (1 | ) |  | 9 |  |  | — |  |  | 9 |
Interest expense | (24 | ) |  | — |  |  | (3 | ) |  | 1 |  |  | (26 | ) |  | — |  |  | (26 | )
Interest capitalized | 3 |  |  | — |  |  | 1 |  |  | — |  |  | 4 |  |  | — |  |  | 4 |
Other—net | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total Nonoperating income (expense) | (11 | ) |  | — |  |  | (2 | ) |  | — |  |  | (13 | ) |  | — |  |  | (13 | )
Income (loss) before income tax | $ | 478 |  |  | $ | 34 |  |  | $ | (9 | ) |  | $ | (3 | ) |  | $ | 500 |  |  | $ | (26 | ) |  | $ | 474 |
| Six Months Ended June 30, 2018
(in millions) | Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenues | $ | 3,153 |  |  | $ | 529 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,682 |  |  | $ | — |  |  | $ | 3,682 |
CPA revenues | — |  |  | — |  |  | 247 |  |  | (247 | ) |  | — |  |  | — |  |  | — |
Mileage plan other revenue | 197 |  |  | 18 |  |  | — |  |  | — |  |  | 215 |  |  | — |  |  | 215 |
Cargo and other | 88 |  |  | 1 |  |  | 2 |  |  | — |  |  | 91 |  |  | — |  |  | 91 |
Total operating revenues | 3,438 |  |  | 548 |  |  | 249 |  |  | (247 | ) |  | 3,988 |  |  | — |  |  | 3,988 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 2,266 |  |  | 488 |  |  | 227 |  |  | (247 | ) |  | 2,734 |  |  | 70 |  |  | 2,804 |
Economic fuel | 799 |  |  | 120 |  |  | — |  |  | — |  |  | 919 |  |  | (35 | ) |  | 884 |
Total operating expenses | 3,065 |  |  | 608 |  |  | 227 |  |  | (247 | ) |  | 3,653 |  |  | 35 |  |  | 3,688 |
Nonoperating income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 24 |  |  | — |  |  | — |  |  | (6 | ) |  | 18 |  |  | — |  |  | 18 |
Interest expense | (44 | ) |  | — |  |  | (10 | ) |  | 5 |  |  | (49 | ) |  | — |  |  | (49 | )
Interest capitalized | 8 |  |  | — |  |  | 1 |  |  | — |  |  | 9 |  |  | — |  |  | 9 |
Other | (4 | ) |  | (9 | ) |  | — |  |  | — |  |  | (13 | ) |  | — |  |  | (13 | )
Total Nonoperating income (expense) | (16 | ) |  | (9 | ) |  | (9 | ) |  | (1 | ) |  | (35 | ) |  | — |  |  | (35 | )
Income (loss) before income tax | $ | 357 |  |  | $ | (69 | ) |  | $ | 13 |  |  | $ | (1 | ) |  | $ | 300 |  |  | $ | (35 | ) |  | $ | 265 |
| Six Months Ended June 30, 2017(d)
(in millions) | Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger revenues | $ | 3,052 |  |  | $ | 495 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,547 |  |  | $ | — |  |  | $ | 3,547 |
CPA revenues | — |  |  | — |  |  | 205 |  |  | (205 | ) |  | — |  |  | — |  |  | — |
Mileage plan other revenue | 194 |  |  | 15 |  |  | — |  |  | — |  |  | 209 |  |  | — |  |  | 209 |
Cargo and other | 81 |  |  | 3 |  |  | 2 |  |  | — |  |  | 86 |  |  | — |  |  | 86 |
Total operating revenues | 3,327 |  |  | 513 |  |  | 207 |  |  | (205 | ) |  | 3,842 |  |  | — |  |  | 3,842 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 2,030 |  |  | 406 |  |  | 219 |  |  | (203 | ) |  | 2,452 |  |  | 63 |  |  | 2,515 |
Economic fuel | 596 |  |  | 75 |  |  | — |  |  | — |  |  | 671 |  |  | 12 |  |  | 683 |
Total operating expenses | 2,626 |  |  | 481 |  |  | 219 |  |  | (203 | ) |  | 3,123 |  |  | 75 |  |  | 3,198 |
Nonoperating income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 17 |  |  | — |  |  | — |  |  | (1 | ) |  | 16 |  |  | — |  |  | 16 |
Interest expense | (47 | ) |  | — |  |  | (5 | ) |  | 1 |  |  | (51 | ) |  | — |  |  | (51 | )
Interest capitalized | 7 |  |  | — |  |  | 1 |  |  | — |  |  | 8 |  |  | — |  |  | 8 |
Other | (1 | ) |  | — |  |  | — |  |  | — |  |  | (1 | ) |  | — |  |  | (1 | )
Total Nonoperating income (expense) | (24 | ) |  | — |  |  | (4 | ) |  | — |  |  | (28 | ) |  | — |  |  | (28 | )
Income (loss) before income tax | $ | 677 |  |  | $ | 32 |  |  | $ | (16 | ) |  | $ | (2 | ) |  | $ | 691 |  |  | $ | (75 | ) |  | $ | 616 |
(a) | Includes consolidating entries, Parent Company, McGee Air Services, and other immaterial business units.
(b) | The Air Group 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.
(c) | Includes merger-related costs, mark-to-market fuel-hedge accounting charges, and other special items.
(d) | Certain historical information has been adjusted to reflect the adoption of new accounting standards.
Total assets were as follows (in millions):
| June 30, 2018 |  | December 31, 2017
Mainline | $ | 15,334 |  |  | $ | 16,663 |
Horizon | 1,039 |  |  | 929 |
Consolidating & Other | (5,318 | ) |  | (6,846 | )
Consolidated | $ | 11,055 |  |  | $ | 10,746 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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