Southwest Airlines to start new flights

Southwest Airlines on Tuesday launched a 72 hour fare sale for flights to and from Philadelphia, a step in its plan to grab customers from major Philly competitor US Airways.The airline said the fares are available for select markets nationwide, including Raleigh/Durham, N.C., starting at $30 each way, Chicago for $60 each way 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.