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All four of the devices were recovered from the two planes that hit the Pentagon and that crashed in rural Pennsylvania. In the case of American Airlines Flight 77, which hit the Pentagon, the FBI reports that the flight data recorder survived and had recoverable information, but the voice recorder was allegedly too damaged to provide any record. In the case of United Airlines Flight 93, which hit the ground at 500 mph in Pennsylvania, the situation was reversed: the voice recorder survived but the flight data box was allegedly damaged beyond recovery.
Originally posted by hands
I'm aware of most of the issues around 9/11 - through reading around the web - but this one seems to have slipped me by ...