hehe the first episode of the X-Files spin off 'the lone gunmen' featured a remotely hijacked and AI flown plane that was going to be crashed into a Major us building.

Seriously thou, there is ample evidence to point to this being the work of islamic agents of terror, not to some far fetched conspiracy theory...

thou it is debatable whether the US had prior warning as to the sept 11 attack.

i'd draw your attention to this article:

 http://www.rense.com/general25/knewknow.htm

which adds yet another 'layer' to the conspiracy for those that are interested.