IIRC, that was the target of Flight 93.
There is still a debate on United 93’s target but this is part of what I found:
http://archives.cnn.com/2002/US/05/23/flight.93/index.html
http://911research.wtc7.net/cache/planes/attack/cbs_f93target.html
http://www.usatoday.com/news/sept11/2002/05/23/attacks-flight93.htm