Cockpit Recorders

According to the 9/11 Commission Report, the cockpit voice recorders (CVR) or flight data recorders , or "black boxes", from Flights 11 and 175 were not recovered from the remains of the WTC attack; however, two men, Michael Bellone and Nicholas DeMasi, who worked extensively in the wreckage of the World Trade Center, said in the book Behind-The-Scenes: Ground Zero that they helped federal agents find three of the four "black boxes" from the jetliners

According to the 9/11 Commission Report, both black boxes from Flight 77 and both black boxes from Flight 93 were recovered. However, the CVR from Flight 77 was said to be too damaged to yield any data. On April 18, 2002, the FBI allowed the families of victims from Flight 93 to listen to the voice recordings.  In April 2006, a transcript of the CVR was released as part of the Zacarias Moussaoui trial.

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