Cleveland Center air traffic controller Bill Keaton is responsible for guiding high-altitude flights in the airspace where Flight 93 turned off its transponder (see (9:40 a.m.) September 11, 2001). After its transponder goes off, he follows Flight 93 on his radar scope as it travels across his sector, headed toward Washington, DC, and is instructed not to let any other aircraft come within 20 miles of it. Because its transponder is off, Keaton cannot tell the plane’s altitude. He sees it disappear from his scope at the time it crashes. [USA Today, 8/11/2002; Cleveland Free Times, 9/6/2006]
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