Southwest Airlines and its AirTran unit have expanded their flight destinations in a bid to reduce dependence on less-profitable connecting flights. Southwest's changes include flights from William P. Hobby Airport in Houston to Raleigh-Durham, N.C., and to Seattle, and from Midway International Airport in Chicago to Oklahoma City, Okla. AirTran plans to add flights to Puerto Rico and Mexico, with more international flights to be added later.

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