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OPERATING SEGMENT INFORMATION (Tables)
 12 Months Ended
Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]  
Schedule of Segment Reporting Information, by Segment
Operating segment information is as follows (in millions):
 
Year Ended December 31, 2018
 
Mainline
 
Regional
 
Horizon
 
Consolidating & Other(b)
 
Air Group Adjusted(c)
 
Special Items(d)
 
Consolidated
Operating revenues
 
 
 
 
 
 
 
 
 
 
 
 
 
Passenger revenues
6,475

 
1,157

 
—

 
—

 
7,632

 
—

 
7,632

CPA revenues
—

 
—

 
508

 
(508
)
 
—

 
—

 
—

Mileage Plan other revenue
397

 
37

 
—

 
—

 
434

 
—

 
434

Cargo and other
191

 
3

 
4

 
—

 
198

 
—

 
198

Total operating revenues
7,063

 
1,197

 
512

 
(508
)
 
8,264

 
—

 
8,264

Operating expenses
 
 
 
 
 
 
 
 
 
 
 
 
 
Non-fuel operating expenses
4,577

 
1,024

 
465

 
(513
)
 
5,553

 
132

 
5,685

Fuel expense
1,652

 
262

 
—

 
—

 
1,914

 
22

 
1,936

Total operating expenses
6,229

 
1,286

 
465

 
(513
)
 
7,467

 
154

 
7,621

Nonoperating income (expense)
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest income
53

 
—

 
—

 
(15
)
 
38

 
—

 
38

Interest expense
(82
)
 
—

 
(22
)
 
13

 
(91
)
 
—

 
(91
)
Interest capitalized
16

 
—

 
2

 
—

 
18

 
—

 
18

Other
(12
)
 
(11
)
 
—

 
—

 
(23
)
 
—

 
(23
)
Total nonoperating expense
(25
)
 
(11
)
 
(20
)
 
(2
)
 
(58
)
 
—

 
(58
)
Income (loss) before income tax
$
809

 
$
(100
)
 
$
27

 
$
3

 
$
739

 
$
(154
)
 
$
585


 
Year Ended December 31, 2017
 
Mainline
 
Regional
 
Horizon
 
Consolidating & Other(b)
 
Air Group Adjusted(c)
 
Special Items(d)
 
Consolidated
Operating revenues
 
 
 
 
 
 
 
 
 
 
 
 
 
Passenger revenues
6,278

 
1,023

 
—

 
—

 
7,301

 
—

 
7,301

CPA revenues
—

 
—

 
426

 
(426
)
 
—

 
—

 
—

Mileage Plan other revenue
387

 
31

 
—

 
—

 
418

 
—

 
418

Cargo and other
167

 
4

 
4

 
—

 
175

 
—

 
175

Total operating revenues
6,832

 
1,058

 
430

 
(426
)
 
7,894

 
—

 
7,894

Operating expenses
 
 
 
 
 
 
 
 
 
 
 
 
 
Non-fuel operating expenses
4,271

 
852

 
427

 
(427
)
 
5,123

 
116

 
5,239

Fuel expense
1,282

 
172

 
—

 
—

 
1,454

 
(7
)
 
1,447

Total operating expenses
5,553

 
1,024

 
427

 
(427
)
 
6,577

 
109

 
6,686

Nonoperating income (expense)
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest income
39

 
—

 
—

 
(5
)
 
34

 
—

 
34

Interest expense
(92
)
 
—

 
(13
)
 
2

 
(103
)
 
—

 
(103
)
Interest capitalized
15

 
—

 
2

 
—

 
17

 
—

 
17

Other
3

 
—

 
—

 
—

 
3

 
—

 
3

Total nonoperating expense
(35
)
 
—

 
(11
)
 
(3
)
 
(49
)
 
—

 
(49
)
Income (loss) before income tax
$
1,244

 
$
34

 
$
(8
)
 
$
(2
)
 
$
1,268

 
$
(109
)
 
$
1,159

 
Year Ended December 31, 2016
 
Mainline(a)
 
Regional
 
Horizon
 
Consolidating & Other(b)
 
Air Group Adjusted(c)
 
Special Items(d)
 
Consolidated
Operating revenues
 
 
 
 
 
 
 
 
 
 
 
 
 
Passenger revenues
4,415

 
977

 
—

 
—

 
5,392

 
—

 
5,392

CPA revenues
—

 
—

 
424

 
(424
)
 
—

 
—

 
—

Mileage Plan other revenue
333

 
37

 
—

 
—

 
370

 
—

 
370

Cargo and other
160

 
4

 
—

 
(1
)
 
163

 
—

 
163

Total operating revenues
4,908

 
1,018

 
424

 
(425
)
 
5,925

 
—

 
5,925

Operating expenses
 
 
 
 
 
 
 
 
 
 
 
 
 
Non-fuel operating expenses
2,919

 
769

 
407

 
(424
)
 
3,671

 
117

 
3,788

Fuel expense
719

 
125

 
—

 
—

 
844

 
(13
)
 
831

Total operating expenses
3,638

 
894

 
407

 
(424
)
 
4,515

 
104

 
4,619

Nonoperating income (expense)
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest income
26

 
—

 
1

 
—

 
27

 
—

 
27

Interest expense
(42
)
 
—

 
(9
)
 
(4
)
 
(55
)
 
—

 
(55
)
Interest capitalized
20

 
—

 
1

 
4

 
25

 
—

 
25

Other
13

 
—

 
—

 
—

 
13

 
—

 
13

Total nonoperating income (expense)
17

 
—

 
(7
)
 
—

 
10

 
—

 
10

Income (loss) before income tax
$
1,287

 
$
124

 
$
10

 
$
(1
)
 
$
1,420

 
$
(104
)
 
$
1,316


(a)
As the acquisition of Virgin America closed on December 14, 2016, Mainline financial results, presented above include Virgin America only for the period from December 14, 2016 to December 31, 2016. Financial results also reflect the impacts of purchase accounting.
(b)
Includes consolidating entries, Parent Company, McGee Air Services, and other immaterial business units.
(c)
The Air Group Adjusted column represents the financial information that is reviewed by management to assess performance of operations and determine capital allocations and excludes certain income and charges.
(d)
Includes merger-related costs, mark-to-market fuel-hedge accounting adjustments, and other special items.
 
2018
 
2017
 
2016
Depreciation and amortization:
 
 
 
 
 
Mainline
$
316

 
$
308

 
$
296

Horizon
82

 
64

 
67

Consolidated
$
398

 
$
372

 
$
363

 
 
 
 
 
 
Capital expenditures:
 
 
 
 
 
Mainline
$
571

 
$
734

 
$
608

Horizon
389

 
292

 
70

Consolidated
$
960

 
$
1,026

 
$
678

 
 
 
 
 
 
Total assets at end of period:
 

 
 

 
 

Mainline
$
16,853

 
$
16,663

 
 
Horizon
1,229

 
929

 
 
Consolidating & Other
(7,170
)
 
(6,846
)
 
 
Consolidated
$
10,912

 
$
10,746