Comment: Hundreds of people need not be involved...

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In reply to comment: Look, my mind is ALWAYS OPEN!!!... (see in situ)

Hundreds of people need not be involved...

just a handful of people with the same objectives, and in the right place at the right time, such as Dick Chaney in charge of NORAD and the presidential bunker, Rumsfeld in the Pentagon, George tucked neatly out of the way.
It only takes one magician and a little slight of hand to make an elephant or an aircraft carrier "disappear" before our very eyes.
In the case of 9/11 all it took was some pre arranged war "games",and some false blips on radar screens and bingo! 3 buildings and 3000 people disappeared.