Airline travel is a crapshoot. I've flown every US based airline and they all pretty much have the same issues. US Airways out of PHL is fantastic as far as schedules and the airport is pretty nice. Customer service in the airport and on the aircrafts are also like playing lotto. But then again, this goes for everyone else in the business. There's a certain airline that loads their passengers like cattle and you couldn't pay me to fly them, yet while everyone applauds them, I've been treated very shabbily every time I've had to use their services.
I'll stick to US Airways and their convenient flights and prices.