Which airport code is NOT located in Pennsylvania?

The airport code for Norfolk International Airport is ORF, and it is not located in Pennsylvania. Instead, it is situated in Virginia. The other airport codes listed pertain to airports that are indeed within Pennsylvania: PIT represents Pittsburgh International Airport, while PHL stands for Philadelphia International Airport. PVD corresponds to T.F. Green Airport, which is located in Rhode Island. Therefore, ORF is the code that correctly identifies an airport outside of Pennsylvania, making it the right choice in this context.