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OPERATING SEGMENT INFORMATION (Tables) | 3 Months Ended
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Mar. 31, 2017
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment | Operating segment information is as follows (in millions):
| Three Months Ended March 31, 2017
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger |  |  |  |  |  |  |  |  |  |  |  |  |
Mainline | $ | 1,272 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,272 |  |  | $ | — |  |  | $ | 1,272 |
Regional | — |  |  | 212 |  |  | — |  |  | — |  |  | 212 |  |  | — |  |  | 212 |
Total passenger revenues | 1,272 |  |  | 212 |  |  | — |  |  | — |  |  | 1,484 |  |  | — |  |  | 1,484 |
CPA revenues | — |  |  | — |  |  | 97 |  |  | (97 | ) |  | — |  |  | — |  |  | — |
Freight and mail | 23 |  |  | 1 |  |  | — |  |  | — |  |  | 24 |  |  | — |  |  | 24 |
Other—net | 222 |  |  | 17 |  |  | 1 |  |  | 1 |  |  | 241 |  |  | — |  |  | 241 |
Total operating revenues | 1,517 |  |  | 230 |  |  | 98 |  |  | (96 | ) |  | 1,749 |  |  | — |  |  | 1,749 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 998 |  |  | 200 |  |  | 103 |  |  | (97 | ) |  | 1,204 |  |  | 40 |  |  | 1,244 |
Economic fuel | 292 |  |  | 36 |  |  | — |  |  | 1 |  |  | 329 |  |  | 10 |  |  | 339 |
Total operating expenses | 1,290 |  |  | 236 |  |  | 103 |  |  | (96 | ) |  | 1,533 |  |  | 50 |  |  | 1,583 |
Nonoperating income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 7 |  |  | — |  |  | — |  |  | — |  |  | 7 |  |  | — |  |  | 7 |
Interest expense | (22 | ) |  | — |  |  | (2 | ) |  | (1 | ) |  | (25 | ) |  | — |  |  | (25 | )
Other | 3 |  |  | — |  |  | — |  |  | 1 |  |  | 4 |  |  | — |  |  | 4 |
| (12 | ) |  | — |  |  | (2 | ) |  | — |  |  | (14 | ) |  | — |  |  | (14 | )
Income (loss) before income tax | $ | 215 |  |  | $ | (6 | ) |  | $ | (7 | ) |  | $ | — |  |  | $ | 202 |  |  | $ | (50 | ) |  | $ | 152 |
| Three Months Ended March 31, 2016
| Mainline |  | Regional |  | Horizon |  | Consolidating & Other(a) |  | Air Group Adjusted(b) |  | Special Items(c) |  | Consolidated
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |
Passenger |  |  |  |  |  |  |  |  |  |  |  |  |
Mainline | $ | 927 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 927 |  |  | $ | — |  |  | $ | 927 |
Regional | — |  |  | 206 |  |  | — |  |  | — |  |  | 206 |  |  | — |  |  | 206 |
Total passenger revenues | 927 |  |  | 206 |  |  | — |  |  | — |  |  | 1,133 |  |  | — |  |  | 1,133 |
CPA revenues | — |  |  | — |  |  | 103 |  |  | (103 | ) |  | — |  |  | — |  |  | — |
Freight and mail | 23 |  |  | 1 |  |  | — |  |  | — |  |  | 24 |  |  | — |  |  | 24 |
Other—net | 172 |  |  | 17 |  |  | 1 |  |  | — |  |  | 190 |  |  | — |  |  | 190 |
Total operating revenues | 1,122 |  |  | 224 |  |  | 104 |  |  | (103 | ) |  | 1,347 |  |  | — |  |  | 1,347 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses, excluding fuel | 701 |  |  | 186 |  |  | 105 |  |  | (102 | ) |  | 890 |  |  | — |  |  | 890 |
Economic fuel | 144 |  |  | 25 |  |  | — |  |  | — |  |  | 169 |  |  | (2 | ) |  | 167 |
Total operating expenses | 845 |  |  | 211 |  |  | 105 |  |  | (102 | ) |  | 1,059 |  |  | (2 | ) |  | 1,057 |
Nonoperating income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 6 |  |  | — |  |  | — |  |  | — |  |  | 6 |  |  | — |  |  | 6 |
Interest expense | (12 | ) |  | — |  |  | (1 | ) |  | — |  |  | (13 | ) |  | — |  |  | (13 | )
Other | 7 |  |  | — |  |  | — |  |  | 2 |  |  | 9 |  |  | — |  |  | 9 |
| 1 |  |  | — |  |  | (1 | ) |  | 2 |  |  | 2 |  |  | — |  |  | 2 |
Income (loss) before income tax | $ | 278 |  |  | $ | 13 |  |  | $ | (2 | ) |  | $ | 1 |  |  | $ | 290 |  |  | $ | 2 |  |  | $ | 292 |
(a) | Includes consolidating entries, Parent Company 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 and mark-to-market fuel-hedge accounting charges.
Total assets were as follows (in millions):
| March 31, 2017 |  | December 31, 2016
Mainline | $ | 15,735 |  |  | $ | 15,260 |
Horizon | 719 |  |  | 690 |
Consolidating & Other | (6,152 | ) |  | (5,988 | )
Consolidated | $ | 10,302 |  |  | $ | 9,962 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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