Posted by Peter G. Chase on July 10, 2017 
BWI has an overhead pedestrian crossing. https://www.google.com/maps/@39.1923191,-76.6943859,60m/data=!3m1!1e3
Posted by Mitch Goldman on July 10, 2017 
Hamilton, NJ and Newark Airport do as well - though neither is in Pennsylvania.
Posted by Peter G. Chase on July 11, 2017 
Sorry, I missed the "in PA" part.
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