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Airlines carve US into markets dominated by 1 or 2 carriers

In this photo taken Tuesday, March 24, 2015, a pair of travelers use a kiosk to check-in for an Alaska Airlines flight at Seattle-Tacoma International Airport in SeaTac, Wash. Delta is building Seattle into a gateway to Asia and adding flights on domestic routes long dominated by Alaska. Seattle-based Alaska has responded by adding service. (AP Photo/Elaine Thompson)

Alaska Airlines is set to begin a nonstop flight to San Diego from St. Louis Lambert International Airport on Dec. 15, the airport said Wednesday. 

San Diego International Airport will be the airline's third destination from St. Louis — the others are to Seattle and Portland, Ore.

The daily roundtrip will be aboard a 76-seat Embraer E175 jet. The flight from San Diego will depart 8:30 a.m. and from St. Louis at 3:55 p.m.

Lambert said the new service is part of a larger expansion for Alaska Airlines to five other markets from San Diego, mostly in the Midwest. 

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