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OPERATING SEGMENT INFORMATION (TABLES)
 12 Months Ended
Dec. 31, 2011
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Operating segment information is as follows (in millions):
 
Alaska
 
 
 
 
 
 
 
 
 
 
Year ended December 31, 2011
Mainline
 
Regional
 
Horizon
 
Consolidating
 
Air Group Adjusted(a)
 
Special Charges
 
Consolidated
Operating revenues
 
 
 
 
 
 
 
 
 
 
 
 
 
Passenger
 
 
 
 
 
 
 
 
 
 
 
 
 
Mainline
$
3,176.2

 
$
—

 
$
—

 
$
—

 
$
3,176.2

 
$
—

 
$
3,176.2

Regional
—

 
774.5

 
—

 
—

 
774.5

 
—

 
774.5

Total passenger revenues
3,176.2

 
774.5

 
—

 
—

 
3,950.7

 
—

 
3,950.7

CPA revenues
—

 
—

 
369.4

 
(369.4
)
 
—

 
—

 
—

Freight and mail
104.6

 
3.9

 
0.2

 
—

 
108.7

 
—

 
108.7

Other-net
249.9

 
0.5

 
8.0

 
—

 
258.4

 
—

 
258.4

Total operating revenues
3,530.7

 
778.9

 
377.6

 
(369.4
)
 
4,317.8

 
—

 
4,317.8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating expenses
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating expenses, excluding fuel(b)
2,015.4

 
543.5

 
340.3

 
(366.9
)
 
2,532.3

 
38.9

 
2,571.2

Economic fuel(c)
1,101.2

 
166.4

 
—

 
—

 
1,267.6

 
30.1

 
1,297.7

Total operating expenses
3,116.6

 
709.9

 
340.3

 
(366.9
)
 
3,799.9

 
69.0

 
3,868.9

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nonoperating income (expense)
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest income
23.9

 
—

 
0.3

 
(2.3
)
 
21.9

 
—

 
21.9

Interest expense
(72.2
)
 
—

 
(17.2
)
 
2.1

 
(87.3
)
 
—

 
(87.3
)
Other
8.9

 
—

 
1.3

 
—

 
10.2

 
—

 
10.2

 
(39.4
)
 
—

 
(15.6
)
 
(0.2
)
 
(55.2
)
 
—

 
(55.2
)
Income (loss) before income tax
$
374.7

 
$
69.0

 
$
21.7

 
$
(2.7
)
 
$
462.7

 
$
(69.0
)
 
$
393.7


 
Alaska
 
 
 
 
 
 
 
 
 
 
Year ended December 31, 2010
Mainline
 
Regional
 
Horizon
 
Consolidating
 
Air Group Adjusted(a)
 
Special Charges
 
Consolidated
Operating revenues
 
 
 
 
 
 
 
 
 
 
 
 
 
Passenger
 
 
 
 
 
 
 
 
 
 
 
 
 
Mainline
$
2,763.4

 
$
—

 
$
—

 
$
—

 
$
2,763.4

 
$
—

 
$
2,763.4

Regional
—

 
330.6

 
394.5

 
0.1

 
725.2

 
—

 
725.2

Total passenger revenues
2,763.4

 
330.6

 
394.5

 
0.1

 
3,488.6

 
—

 
3,488.6

CPA revenues
—

 
—

 
274.4

 
(274.4
)
 
—

 
—

 
—

Freight and mail
101.9

 
1.8

 
2.5

 
—

 
106.2

 
—

 
106.2

Other-net
228.8

 
0.1

 
8.6

 
—

 
237.5

 
—

 
237.5

Total operating revenues
3,094.1

 
332.5

 
680.0

 
(274.3
)
 
3,832.3

 
—

 
3,832.3

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating expenses
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating expenses, excluding fuel(b)
1,916.9

 
298.9

 
502.1

 
(271.3
)
 
2,446.6

 
13.2

 
2,459.8

Economic fuel(c)
757.3

 
—

 
138.3

 
—

 
895.6

 
5.3

 
900.9

Total operating expenses
2,674.2

 
298.9

 
640.4

 
(271.3
)
 
3,342.2

 
18.5

 
3,360.7

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nonoperating income (expense)
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest income
34.8

 
—

 
3.6

 
(9.0
)
 
29.4

 
—

 
29.4

Interest expense
(96.5
)
 
—

 
(20.5
)
 
8.7

 
(108.3
)
 
—

 
(108.3
)
Other
13.1

 
—

 
0.1

 
—

 
13.2

 
—

 
13.2

 
(48.6
)
 
—

 
(16.8
)
 
(0.3
)
 
(65.7
)
 
—

 
(65.7
)
Income (loss) before income tax
$
371.3

 
$
33.6

 
$
22.8

 
$
(3.3
)
 
$
424.4

 
$
(18.5
)
 
$
405.9

 
Alaska
 
 
 
 
 
 
 
 
 
 
Year ended December 31, 2009
Mainline
 
Regional
 
Horizon
 
Consolidating
 
Air Group Adjusted(a)
 
Special Charges
 
Consolidated
Operating revenues
 
 
 
 
 
 
 
 
 
 
 
 
 
Passenger
 
 
 
 
 
 
 
 
 
 
 
 
 
Mainline
$
2,438.8

 
$
—

 
$
—

 
$
—

 
$
2,438.8

 
$
—

 
$
2,438.8

Regional
—

 
286.7

 
381.9

 
—

 
668.6

 
—

 
668.6

Total passenger revenues
2,438.8

 
286.7

 
381.9

 
—

 
3,107.4

 
—

 
3,107.4

CPA revenues
—

 
—

 
261.7

 
(261.7
)
 
—

 
—

 
—

Freight and mail
91.5

 
1.7

 
2.7

 
—

 
95.9

 
—

 
95.9

Other-net
187.3

 
1.1

 
8.1

 
—

 
196.5

 
—

 
196.5

Total operating revenues
2,717.6

 
289.5

 
654.4

 
(261.7
)
 
3,399.8

 
—

 
3,399.8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating expenses
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating expenses, excluding fuel(b)
1,910.9

 
280.5

 
504.5

 
(257.4
)
 
2,438.5

 
35.8

 
2,474.3

Economic fuel(c)
622.7

 
—

 
124.2

 
—

 
746.9

 
(88.8
)
 
658.1

Total operating expenses
2,533.6

 
280.5

 
628.7

 
(257.4
)
 
3,185.4

 
(53.0
)
 
3,132.4

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nonoperating income (expense)
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest income
38.6

 
—

 
2.0

 
(8.0
)
 
32.6

 
—

 
32.6

Interest expense
(91.7
)
 
—

 
(20.1
)
 
7.5

 
(104.3
)
 
—

 
(104.3
)
Other
8.1

 
—

 
0.1

 
(1.0
)
 
7.2

 
—

 
7.2

 
(45.0
)
 
—

 
(18.0
)
 
(1.5
)
 
(64.5
)
 
—

 
(64.5
)
Income (loss) before income tax
$
139.0

 
$
9.0

 
$
7.7

 
$
(5.8
)
 
$
149.9

 
$
53.0

 
$
202.9

(a) 
The 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 charges.
(b) 
Refer to Note 14 for a summary of special charges for each respective period.
(c) 
Represents adjustments to reflect the timing of gain or loss recognition resulting from mark-to-market fuel-hedge accounting.

 
2011
 
2010
 
2009
Depreciation:
 
 
 
 
 
Alaska(a)
$
202.9

 
$
188.5

 
$
178.5

Horizon
43.4

 
41.0

 
39.5

Parent company
0.6

 
1.0

 
1.2

Consolidated
$
246.9

 
$
230.5

 
$
219.2

 
 
 
 
 
 
Capital expenditures:
 
 
 
 
 
Alaska(a)
$
250.5

 
$
166.2

 
$
357.5

Horizon
136.9

 
19.1

 
80.9

Consolidated
$
387.4

 
$
185.3

 
$
438.4

 
 
 
 
 
 
Total assets at end of period:
 

 
 

 
 

Alaska(a)
$
4,803.3

 
$
4,610.2

 
 
Horizon
846.5

 
747.2

 
 
Parent company
1,583.5

 
1,375.6

 
 
Elimination of inter-company accounts
(2,038.3
)
 
(1,716.4
)
 
 
Consolidated
$
5,195.0

 
$
5,016.6

 
 
(a) 
There are no depreciation expenses, capital expenditures or assets associated with purchased capacity flying at Alaska.