I will be flying in from Paris on USAirways into Philadelphia, and then on to Pittsburgh. What I had wanted to know is how the customs and immigration works in the Philly airport. When I recently flew Shannon Ireland to Boston, I did US immigration in Ireland and just customs in Boston. Is Philly that way as well? Also I believe that the gate to Pittburgh is in the B-Terminal is that a long way from where you depart the customs area?