Recently Ryan did a post on the US military's use of energy directed weapons... and certain 'weapon testing' examples as Fallujah in Iraq.
Everything about the US Governments bodgey 'cover story' regarding 9/11 seems to be directed at keeping the public believing that everything about the attacks needed to be 'up close and personal' and based on well known, or even primitive technology.
For example, the terrorists needed to be on the plane (the 19 men blamed for the attack were never there), and that bombs did need to be placed in the building in order for a controlled demolition to take place. Indeed, there's a posibility that something was placed in the building, and it may have even helped, but it is possible that more is going on than that...
Besides, everyone knows it is simpler (and more easy to deny or cover up) if you can do something by remote.
It is probable that certain elements of the US Government (military/industrial complex, perhaps?) have access to technology that would enable them to not only hijack a plane remotely, but demolish a building from a distance too. Such a thing might make shooting down a moving target such as a space shuttle 'a snap'...
As long as what they do isn't too obvious, is hidden or has a good 'cover' story, such things may end having dual or multiple results.
By the way, could you let us know where the information source for the injured janitor is/was? Thanks. That would be appreciated.