I'm reminded of a piece of film I saw way back. The idea was to test the resistance of concrete shrouds around nuclear facilities to impact from aircraft. A typical concrete wall was constructed across a railtrack. An F-4 was attached to a rocket sled and fired at the wall. Impact speed was around 500mph. The Sled and F4 just vanished. Everything was vapourised and there was minimal damage to the concrete wall. Not too dissimilar to this scenario. The Pentagon is fairly hardened - in fact I believe it had just undergone a hardening programme prior to the impact. The only real difference is the windows. It's my guess that the aircraft vapourised on impact at the base of building. The shockwave blew out the windows, the practically atomised fuel entered the building through the windows and exploded in a way similar to a fuel air bomb and the resulting heat caused the structural failure of the building. How much of the aircraft was recovered? David On Saturday 09 March 2002 11:07 pm, Niels Sampath wrote: > On the other hand, > there were a lot of eyewitnesses.... > > or WERE there?<g> > > On 9 Mar 02, at 17:21, UPSplane@aol.com wrote: > > And if it did come in at 400mph, that's the only damaged it caused?? > > Where black boxes ever found?? To many questions here for sure ... > > something's not right. > > > > In a message dated 3/9/2002 9:01:05 AM Eastern Standard Time, > > > > airlinephoto@yahoo.com writes: > > > i'll admit to that- definetely no plane on that video- unless the > > > airplane came in at 400 mph and all we saw was the streak of it- i dont > > > know but yes, that definetely got me saying- what the hell??? > > > ok now this is getting more weird > > > > > > Niels Sampath <niels@north-star.fsnet.co.uk> wrote: Unless I missed > > > it I'm surprised no one has mentioned that the > > > video still shots (=grassy knoll shots?) released yesterday, taken > > > from the parking lot also show no plane...just the side of the > > > building blowing up. > > > -- > > > Niels > > > > Carlos Borda > > Carlos' Airliner Images! > > http://members.aol.com/upsplane/homepage.html > > http://airliners.net/search/photo.search?emailsearch=upsplane@aol.com > > <<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>>>>