One warning about PHL. A bit hairy if you're arriving/departing on US flights. When I was flying in from GSO on a Saturday AM a few weeks back, the deadheading FAs in the F cabin were complaining that it is gridlock for US flights (waited 35 mins to get a gate that AM) and one gave himself 2 hours to get onto the flight he would be working on. The a/c apparently are often caught in a grid lock around the gates.