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Chief Financial Officer Glenn Johnson told investors last month the company is remaining disciplined in terms of capacity, which is measured by the available seats an airline offers times the miles flown.

The parent company said at the time that Alaska Airlines' capacity is expected to increase 1 percent to 2 percent in 2010, while Horizon Air's will probably be flat.

Alaska Air has a partnership with Delta Air Lines, the world's biggest airline.

Alaska Airlines and Horizon Air serve more than 90 cities through their network in Alaska, Hawaii, the continental U.S., Canada and Mexico.

Earlier this month, Alaska Airlines lost a challenge of rival Virgin America's citizenship status. The Transportation Department said Virgin America, a privately held carrier based in Burlingame, Calif., is under the control of U.S. citizens. Foreign ownership in a U.S. air carrier is limited to 25 percent of the voting interest in the carrier.

The Virgin Group, controlled by British billionaire Richard Branson, is a minority holder in Virgin America. DOT said the Virgin Group has a 25 percent equity stake in Virgin America.

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On the Net:

Alaska Air Group Inc.: http://www.alaskaair.com