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FAA Managers Destroyed 9/11 Tape
Recording Contained Accounts of Communications With Hijacked Planes

Six air traffic controllers provided accounts of their communications with hijacked planes on Sept. 11, 2001, on a tape recording that was later destroyed by Federal Aviation Administration managers, according to a government investigative report issued today.

It is unclear what information was on the tape because no one ever listened to, transcribed or duplicated it. . .

Washington Post article