The National Transportation Safety Board (NTSB) this week released full transcripts of the air traffic control recordings from the four flights hijacked on September 11, 2001, and meticulous Flight Path Studies for three of the flights, in response to a Freedom of Information request by the National Security Archive. The studies, posted on the Web today by the National Security Archive, provide the most detailed technical information available to date related to the hijackings, and the transcripts of the aircraft-to-ground communications are the first complete government disclosure of each flight's air traffic control recordings.
The transcripts provide additional details to the information summarized in the 9/11 Commission Report. For example, the NTSB transcript differs slightly from the Commission's text of the warning that United Airlines Flight 93 received only minutes before the hijackers attacked. At 9:23am, the Aircraft Communications Addressing and Reporting System (ACARS) shows a text message to Flight 93 reading: "BEWARE OF ANY COCKPIT INTROUSION [sic]. TWO AIRCRAFT IN NY, HIT TRADE CNTER BUILDS [sic]." Five minutes later at 9:28am Flight 93 was sending the message "***(mayday)*** (hey get out of here) ***" as it was being hijacked.
(NATIONAL SECURITY ARCHIVES)
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