(9:35 a.m.) September 11, 2001: Silent Flight 93 Climbs and Drops; NORAD Still Not Notified

When Flight 93 is over Youngstown, Ohio, Stacey Taylor and other Cleveland flight controllers see it rapidly climb 6,000 feet above its assigned altitude of 35,000 feet and then rapidly descend. The plane drops so quickly toward Cleveland that the flight controllers worry they might be the target. Other accounts say the climb occurs around 9:35 a.m. Controllers continue to try to contact the plane but still get no response. [Guardian, 10/17/2001; USA Today, 8/13/2002; 9/11 Commission, 6/17/2004]