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OPERATING SEGMENT INFORMATION (TABLES)
9 Months Ended
Sep. 30, 2011
Segment Reporting [Abstract] 
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Operating segment information for Alaska and Horizon for the three and nine months ended September 30 were as follows (in millions):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2011
 
2010
 
2011
 
2010
Operating revenues:
 
 
 
 
 
 
 
Alaska—mainline passenger(a)
$
887.4

 
$
779.2

 
$
2,409.7

 
$
2,068.5

Alaska—regional passenger(a)
213.4

 
88.9

 
584.2

 
247.6

Total Alaska passenger revenues
$
1,100.8

 
$
868.1

 
$
2,993.9

 
$
2,316.1

Alaska—other revenues
95.3

 
88.0

 
273.3

 
250.1

Total Alaska operating revenues
$
1,196.1

 
$
956.1

 
$
3,267.2

 
$
2,566.2

Horizon—brand flying(b)
—

 
109.2

 
—

 
299.4

Horizon—CPA
91.2

 
69.0

 
279.3

 
202.8

Horizon—other revenues
2.0

 
2.7

 
6.3

 
8.2

Total Horizon operating revenues
$
93.2

 
$
180.9

 
$
285.6

 
$
510.4

Elimination of inter-company revenues
(91.2
)
 
(69.0
)
 
(279.3
)
 
(202.8
)
Consolidated operating revenues
$
1,198.1

 
$
1,068.0

 
$
3,273.5

 
$
2,873.8

 
 
 
 
 
 
 
 
Operating expenses:
 
 
 
 
 
 
 
Alaska—mainline, excluding fuel
$
504.1

 
$
491.8

 
$
1,500.2

 
$
1,433.5

Alaska—mainline fuel
376.7

 
188.1

 
889.2

 
574.3

Alaska—regional
179.9

 
74.7

 
530.9

 
221.5

Total Alaska operating expenses
$
1,060.7

 
$
754.6

 
$
2,920.3

 
$
2,229.3

Horizon(c)
84.9

 
165.1

 
295.8

 
492.6

Other(d)
0.5

 
0.4

 
1.9

 
2.4

Elimination of inter-company expenses
(91.2
)
 
(69.0
)
 
(279.3
)
 
(202.8
)
Consolidated operating expenses
$
1,054.9

 
$
851.1

 
$
2,938.7

 
$
2,521.5

 
 
 
 
 
 
 
 
Nonoperating expenses:
 

 
 

 
 

 
 

Alaska
$
(13.8
)
 
$
(14.5
)
 
$
(29.4
)
 
$
(36.2
)
Horizon
(3.9
)
 
(4.1
)
 
(12.1
)
 
(13.5
)
Other(d)
(0.2
)
 
(0.1
)
 
(0.3
)
 
(0.2
)
Consolidated nonoperating expenses
$
(17.9
)
 
$
(18.7
)
 
$
(41.8
)
 
$
(49.9
)
 
 
 
 
 
 
 
 
Income (loss) before income tax:
 

 
 

 
 

 
 

Alaska—mainline
$
87.0

 
$
172.4

 
$
260.9

 
$
273.3

Alaska—regional
34.6

 
14.6

 
56.6

 
27.4

Total Alaska
$
121.6

 
$
187.0

 
$
317.5

 
$
300.7

Horizon(c)
4.4

 
11.7

 
(22.3
)
 
4.3

Other(d)
(0.7
)
 
(0.5
)
 
(2.2
)
 
(2.6
)
Consolidated income before income tax
$
125.3

 
$
198.2

 
$
293.0

 
$
302.4

Reconciliation of Assets from Segment to Consolidated [Table Text Block]
 
September 30, 2011
 
December 31, 2010
Total assets at end of period:
 
 
 
Alaska
$
4,845.2

 
$
4,610.2

Horizon
794.1

 
747.2

Other(d)
1,595.2

 
1,375.6

Elimination of inter-company accounts
(1,974.3
)
 
(1,716.4
)
Consolidated
$
5,260.2

 
$
5,016.6