USA Today reports Southwest Airlines will start a Philly-to-Boston route, and that might bring down the cost of the 281-mile trip. "A check of USAirways.com at 11:10 a.m. ET a nonrefundable fare of $1,121 for a Tuesday-Wednesday round-trip itinerary for nonstop flights on June 29-30. (Connecting flights via Pittsburgh were going for $339). A check on Southwest.com showed at the same time showed a price of $139 for nonstop flights at comparable times on the same days. Presumably, US Airways will move to match the just-announced Southwest route. As for Southwest, it says on its corporate blog: "When we first announced our new service to Boston (BOS) last year , one of the most frequently-asked-for markets was BOS-Philadelphia (PHL). It wasn't in the initial plans---but starting June 27th, we're jumping in with five daily round-trips!""