On September 11, 2001 terrorists intentionally flew two planes into the Twin Towers in New York City, and a third into the Pentagon.
A fourth aircraft, United Airlines Flight 93, crashed into an open field in Somerset County, Pennsylvania, killing everyone on board. The plane was only 20 minutes flying-time from Washington, D.C., and was the only one of the four aircraft hijacked that day, that failed to reach the terrorists’ intended target. The passengers and crew showed unity, courage, and defiance in the face of adversity.
Learn more about the Flight 93 National Memorial site, at http://www.nps.gov/flni/learn/index.htm