First we build a tower the same size as tower 1 or 2 of the trade centre out of the same materials. We invite all the conspiracy theorists to come on down and have a look around with sniffy dogs to check we haven't hidden any charges anywhere. When they're happy with this, we move them into the bottom few floors of the tower and sling a large passenger aircraft into somewhere near the top.
If they're happy to stay inside for 2 hours then I'll happily hear all they have to say about 9/11 when they come out.