I don't want to discourage you but last summer on US Air, we had to connect in PHL. The airport itself was filthy, most of the workers unhelpful, we had to take a shuttle to the connecting gate and our luggage never made it onto the plane. Then due to rain, we ended sitting on the runway for 3 hrs, in the middle of summer with no air conditioning "to save fuel".
We vowed we would never connect in PHL again. We're giving US Air another shot but going to Charlotte this time.
Good luck.