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"The American Airlines FAA Principal Security Inspector (PSI) was notified by Suzanne Clark of American Airlines Corporate Headquarters that an on board flight attendant contacted American Airlines Operations Center and informed that a passenger located in seat 10B shot and killed a passenger in seat 9B at 9:20 a.m. The passenger killed was Daniel Lewin, shot by passenger Satam Al Suqami. One bullet was reported to have been fired."

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FAA and American Airline officials later deny the gun story and suggest that Lewin was probably stabbed to death instead. Officials assert that the leaked document was a “first draft,” and subsequently corrected, but declines to release the final draft, calling it “protected information.” However, an FAA official present when the memo was drafted will dispute the FAA’s claim, asserting that “[t]he document was reviewed for accuracy by a number of people in the room, including myself and a couple of managers of the operations center.”
http://worldnetdaily.com/news/article.asp?ARTICLE_ID=26732

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"An early draft report of an executive summary prepared by FAA security staff for the agency's leadership referred to an alleged report of a shooting aboard Flight 11. We believe this report was erroneous for a number of reasons-- there is no evidence that the hijackers purchased firearms, use of a gun would be inconsistent with the otherwise common tactics employed by the hijackers, the alleged shooting victim was seated where witness accounts place the stabbing victim (9B), and, most important, neither Betty Ong nor Amy Sweeney the only two people who communicated to the ground from aboard the aircraft, reported the presence of a gun or shooting. Both reported knives and stabbings."
http://www.gpoaccess.gov/911/pdf/notes.pdf