9:36 a.m. September 11, 2001: Cleveland Center Receives Numerous Bomb Threats Concerning Planes

According to a book about the FAA’s response to the 9/11 attacks, Cleveland Center air traffic controllers follow Flight 93 as it turns south and reverses course (see (9:36 a.m.) September 11, 2001). But, “bomb threats called in concerning four other planes focused their attention onto what they believed to be more critical maneuvers.” [Freni, 2003, pp. 40] One of these four planes is presumably Delta Flight 1989, which is mistakenly thought to be hijacked and to have a bomb aboard (see (9:28 a.m.-9:33 a.m.) September 11, 2001). [WKYC, 9/11/2006] The identities of the other three planes are unknown. By this time, Cleveland Center has already overheard a radio transmission from Flight 93 stating, “We have a bomb on board” (see (9:32 a.m.) September 11, 2001), and has acknowledged this, reporting, “United 93 may have a bomb on board,” so it seems unlikely that other threatened aircraft would be regarded as “more critical maneuvers.” [9/11 Commission, 6/17/2004 ]