You always want to rely on USAirways Express to get you to your international flight, especially in Philly. Why, just today, if you check the online stats regarding 3978, you will see that it ran a little late because they couldn't find anybody to fly it. It's a pretty laid back operation. No stress on the staff. And while you will be able to check your stuff straight to Rome, there might even be time for a game of hide the weenie with your baggage. Be wary, however, they are very good at it. My favorite is the bus from the commuter terminal to C-16. It's better than Great Adventure.