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OPERATING SEGMENT INFORMATION (Tables)
 3 Months Ended
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