Amer Mohammed Kamfar is a licensed Saudi pilot and turbojet engineer (also referred to as Amer Taiybkamfar, but who personally preferred the name John) who was initially reported to be one of the hijackers aboard American Airlines Flight 11 as part of the September 11, 2001 attacks. Later he was described as "(his) name appeared on the list of passengers on board the United Airlines flight". Wikipedia
The definitive Wikipedia entry for Amer Kamfar. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Amer_Kamfar