All I can say is What a Dipshit!
Evidently the author doesn't believe that a 400,000 lb aircraft (767-200) with 20,000 gallons of fuel is enough force to drop the buildings (Or the 300,000 lb, 10,000 gallon 757-200).
He obviously missed the History Channel special on 9/11, in which members of the Trade Center design team noted that while they had modeled the idea of a 707 hitting the buildings (about 300,000 lbs in the 320B configuration) they had never taken into account the buring fuel and it's effect on the structure, thinking the sprinklers would probably take care of any fire. In fact a major reason for the exoskelton design of the buildings was to absorb the impact, which they did quite well.
The problem is, as anyone who's dealt with fire in enclosed spaces can tell you, heat is a bitch. And when you heat up say, 20,000 gallons of Jet A fuel, you're going to cause problems with the steel structures around it, causing collapses.
Though this idiot didn't bring it up, cyberspace is full of loons who say that the glass blowing out of the building is proof of demolition charges. BULLSHIT..... When the steel that holds up a concrete slab floor gives way, the concrete falls (gravity is a pain!), creating an area of great air pressure under it as it compresses, since the windows were the weak point, they blew out. If you still don't believe that, do a simple experiment, place some confetti on the floor, from a few feet above drop a pillow down on the confetti, and see if it says put, or moves outward from the pillow.
Sorry, but to all the folks who believe Isreal blew up the Trade Center so we'd start a war, your crap is getting old. I am glad Charlie posted the letter though, it reminds me of the numbskulls that are out there.
(thanks for the linkback Charlie)