A voice believed to be that of al Qaeda hijack leader Mohamed Atta urged passengers to "stay quiet and you'll be OK" as the hijackers steered American Airlines Flight 11 toward the World Trade Center. The commission investigating the September 11 attacks played tapes of the hijackers, ground control and military controllers in the final day of public hearings into the attacks.
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Confused response | Transcript
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Hijackers' voices | Timeline
9/11 panel: U.S. unprepared 'in every respect'
Audio Slide Show: Panel hears sinister voices