Shanksville, PA, crash site

A National Transportation Safety Board worker walks by an FBI trailer at the crash site of United Airlines Flight 93 in Shanksville, PA,12 September 2001.

( DAVID MAXWELL/AFP/Getty Images )

A National Transportation Safety Board worker walks by an FBI trailer at the crash site of United Airlines Flight 93 in Shanksville, PA,12 September 2001.

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