PHL Philadelphia serves the great Philadelphia area. There’s good information at the Philadelphia Airport website although some of it is buried or dead ends you at thin pages.
Note that you can use SEPTA High Speed rail to get from the airport to the downtown historic district (this is Philadelphia’s biggest attraction – the square mile of American History in the old city district. Independence National Historic Park is here with the Independence Hall, the Liberty Bell, Ben Franklin’s House, and much more. Allow at least two days to explore the history and great dining of Philadelphia’s historic district.
The Convention Center is located about 5 blocks from the Historic area and is an easy walk.