Does anyone recall the number of cities flown by WN out of PHL at it's peak. Service was announced in 2003 with great fanfare but safe to say US and AA have really pushed them down to a small and niche operator.
Southwest Airlines announces that Philadelphia will become our 60th destination in May 2004 when we launch service to MDW, TPA, MCO, PVD, LAS and PHX out of four gates at PHL.
From what I can recall, I think the below were flown but now discontinued:
West Palm Beach
Houston (but recently returned)
I might be missing a few but a lot of them were victims of US matching fares on popular routes (such as BOS, PIT, RDU), the decline of shorter segment flights (like BDL and PVD), and some are even from from recent ULCC competition (LAS). Such a shame as I really would have like to see WN become larger in PHL than they were!