See, too:Accuracy in Media and Federal investigators said on Thursday that they have not ruled out the possibility that United Airlines Flight 93 was shot down over Pennsylvania, after three other hijacked airliners crashed into the World Trade Center and the Pentagon.
See also: Buzzflash: three-mile Island terrorists's target? and Evidence indicates Flight 93 shot down by U.S. fighter (via Idaho Observer), and UPDATE UPI report excerpt: "The employee also told the newspaper that FAA air traffic controllers in Nashua learned through discussions with other controllers that an F-16 fighter stayed in hot pursuit of another hijacked commercial airliner until it crashed in Pennsylvania."
See also: Timeline of jet fighter(s) from Langley. And finally: Congresswoman and flight 903 widow denied access to flight recorder box information.