9/11 Black Boxes not missing, FBI has them.

9/11: Missing Black Boxes in World Trade Center Attacks Found by Firefighters, Analyzed by NTSB, Concealed by FBI

One of the more puzzling mysteries of 9-11 is what ever happened to the flight recorders of the two planes that hit the World Trade Center towers. Now it appears that they may not be missing at all. Counterpunch has learned that the FBI has them. Flight recorders (commonly known as black boxes, though these days they are generally bright orange) are required on all passenger planes. There are always two-a flight data recorder that keeps track of a plane's speed, altitude, course and maneuvers, and a cockpit voice recorder which keeps a continuous record of the last 30 minutes of conversation inside a plane's cockpit. These devices are constructed to be extremely durable, and are installed in a plane's tail section, where they are least likely suffer damaged on impact. They are designed to withstand up to 30 minutes of 1800-degree heat (more than they would have faced in the twin towers crashes), and to survive a crash at full speed into the ground.

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