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OPERATING SEGMENT INFORMATION (Tables)
 3 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Operating segment information is as follows (in millions):
 
Three Months Ended March 31, 2018
 
Mainline
 
Regional
 
Horizon
 
Consolidating & Other(a)
 
Air Group Adjusted(b)
 
Special Items(c)
 
Consolidated
Operating revenues
 
 
 
 
 
 
 
 
 
 
 
 
 
Passenger revenues
$
1,442

 
$
243

 
$
—

 
$
—

 
$
1,685

 
$
—

 
$
1,685

CPA revenues
—

 
—

 
110

 
(110
)
 
—

 
—

 
—

Mileage plan other revenue
98

 
9

 
—

 
—

 
107

 
—

 
107

Cargo and other
39

 
—

 
1

 
—

 
40

 
—

 
40

Total operating revenues
1,579

 
252

 
111

 
(110
)
 
1,832

 
—

 
1,832

Operating expenses
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating expenses, excluding fuel
1,131

 
239

 
104

 
(111
)
 
1,363

 
31

 
1,394

Economic fuel
367

 
55

 
—

 
—

 
422

 
(13
)
 
409

Total operating expenses
1,498

 
294

 
104

 
(111
)
 
1,785

 
18

 
1,803

Nonoperating income (expense)
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest income
11

 
—

 
—

 
(3
)
 
8

 
—

 
8

Interest expense
(22
)
 
—

 
(5
)
 
3

 
(24
)
 
—

 
(24
)
Interest capitalized
4

 
—

 
1

 
—

 
5

 
—

 
5

Other—net
(5
)
 
(7
)
 
—

 
—

 
(12
)
 
—

 
(12
)
Total Nonoperating income (expense)
(12
)
 
(7
)
 
(4
)
 
—

 
(23
)
 
—

 
(23
)
Income (loss) before income tax
$
69

 
$
(49
)
 
$
3

 
$
1

 
$
24

 
$
(18
)
 
$
6

 
Three Months Ended March 31, 2017(d)
 
Mainline
 
Regional
 
Horizon
 
Consolidating & Other(a)
 
Air Group Adjusted(b)
 
Special Items(c)
 
Consolidated
Operating revenues
 
 
 
 
 
 
 
 
 
 
 
 
 
Passenger revenues
$
1,375

 
$
227

 
$
—

 
$
—

 
$
1,602

 
$
—

 
$
1,602

CPA revenues
—

 
—

 
97

 
(97
)
 
—

 
—

 
—

Mileage plan other revenue
93

 
7

 
—

 
—

 
100

 
—

 
100

Cargo and other
36

 
1

 
1

 
—

 
38

 
—

 
38

Total operating revenues
1,504

 
235

 
98

 
(97
)
 
1,740

 
—

 
1,740

Operating expenses
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating expenses, excluding fuel
1,000

 
200

 
103

 
(98
)
 
1,205

 
39

 
1,244

Economic fuel
292

 
37

 
—

 
—

 
329

 
10

 
339

Total operating expenses
1,292

 
237

 
103

 
(98
)
 
1,534

 
49

 
1,583

Nonoperating income (expense)
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest income
7

 
—

 
—

 
—

 
7

 
—

 
7

Interest expense
(23
)
 
—

 
(2
)
 
—

 
(25
)
 
—

 
(25
)
Interest capitalized
4

 
—

 
—

 
—

 
4

 
—

 
4

Other—net
(1
)
 
—

 
—

 
—

 
(1
)
 
—

 
(1
)
Total Nonoperating income (expense)
(13
)
 
—

 
(2
)
 
—

 
(15
)
 
—

 
(15
)
Income (loss) before income tax
$
199

 
$
(2
)
 
$
(7
)
 
$
1

 
$
191

 
$
(49
)
 
$
142

(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):
 
March 31, 2018
 
December 31, 2017
Mainline
$
15,088

 
$
16,663

Horizon
945

 
929

Consolidating & Other
(5,185
)
 
(6,846
)
Consolidated
$
10,848

 
$
10,746