We are flying from Philadelphia to Rome. /QUOTE]
I see that you live in Bristol, I'm about 15 minutes away from you in Westampton which is near Mount Holly. You may save some money by flying out of Newark (EWR). You'll probably have more flight choices and the prices for international flights from there are normally better. You'll also avoid US Air. It should take you approx. 45-50 minutes to get there from Bristol.
My one international flight we took was out of Neward on British Airways. Excellent experience, I highly recommend them. My parents who are always going to Europe swear by Contintental.
One other thing is that you'll most likely get a bigger plane when flying out of EWR. You'll most likely get the 747 which has a good amount of leg room which helps on the international flight which you should try to sleep on since your flight will be at night and when you land it will be the next day in the am.