updated 3/16/2010 11:59:32 AM ET 2010-03-16T15:59:32

Southwest Airlines on Tuesday launched a 72-hour fare sale for flights between Philadelphia and three cities, a step in its plan to grab customers from major Philly competitor US Airways.

Fares are available for travel between Philadelphia and Raleigh/Durham, N.C. starting at $30 each way, between Philadelphia and Chicago for $60 each way and between Philadelphia and Denver for $90 each way.

Tickets must be purchased by Thursday at 11:59 p.m. PDT for travel on Tuesdays, Wednesdays, and Saturdays between April 6 and May 26.

Southwest is aggressively courting business fliers currently using US Airways, which has a hub in Philadelphia. Some passengers currently pay walkup fares exceeding $1,000.

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