Asserting that genuine Arab hijackers did not carry out the attacks of 9/11 requires analysis of two concomitant categories: the history of American (and Israeli) involvement (and subterfuge) with Arab terrorists, and methods of remote control of aircraft, or other means of piloting the aircraft.

The remote control aspect continues to be a bone of contention among legitimate pilots, with some asserting only real pilots could have made such extemporaneous maneuvers and others insisting only remote control could have accomplished such a feat. An interesting new perspective on this debate can be found here:

A third natural area of study in this regard would be the intimate histories of those whom officials claim to be the hijackers, including putting the microscope on their behavior in the days and weeks before the tragedy.

Many researchers claim the name al-Qaeda was made up in middle ‘90s by a variety of American functionaries (one of them being none other than Richard Clarke) as an all-purpose villain the U.S. could blame as a convenient reason for its military adventurism. And a group of Israeli provocateurs was recently discovered trying to create their own faux version of al-Qaeda.

How many more hints do you need? The absence of any relevant arrests or discovery of any clues to the hierarchy of this supposedly worldwide terror group should tell you a lot.