The terminals at Philadelphia international airport each have a letter from A till F.

After arrival with a Boeing 767-200ER from Amsterdam this is the view,
as the airliner parks between US Airways Airbus A330 airlines.
All these US Airways widebodies are used on daily flights to Europe. In
november 2003 they are all parked at the same terminal and during the
evening between 6 pm and 10 pm they all leave Philadelphia for a short
night over the Atlantic to arrive in Europe the next morning. Then in
the late afternoon the next day these airlines will be back from Europe
in Philadelphia.