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"At approximately 9:18 am, it was reported that two of the crew members in the cockpit were stabbed. The flight then descended with no communication from the flight crew members. The American Airlines Principal Security Inspector (PSI) was notified by Suzanne Clark of the American Airlines Corporate Headquarters that an on board flight attendant contacted American Airlines Operations Center and informed them that a passenger located in seat 10B had shot and killed a passenger in 9B at 9:20 am. The passenger killed was Daniel Lewin, shot by passenger Satam Al Suqami. One bullet was reported to have been fired."
FAA und American Airlines bestreiten die Aussagekraft des Memos!
WND does illustrate how both the FAA and American Airlines denied knowledge of the document - one saying it was never sent, and the other saying it never was received. Sierra Times questions the authenticity of the document as a whole.
Link
911review.org/brad.com/archives/passenger_shot_FAA_memo.html