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of course the buildings were designed to withstand a direct hit from an airliner (full of fuel). this is engineering 101. structures like this are designed for the worst case scenario.
can you imagine if a bridge collapsed because it was completely full of stopped cars in rush hour and the design engineer said "oh shit, we never factored that in".
so do you think the engineer fucked up and made it strong enough to withstand the impact but not the fire afterwards? right, fire is very rare in a plane crash.
the fire wasn't that bad, that's why there was thick black smoke. the sign of a fuel/oxygen starved fire. the firefighters that reached the area reported that the fire wasn't that bad and they could knock it down with a few hoses. the people responsable wanted to let it burn longer to make it more believable but the fire was dying out fast so they pulled the building early.
this was a historical moment because no steel structured building has ever collapsed from damage like this. it was so historical that NOT ONE engineering standard was changed as a result of the collapse!
btw, if this was such a successfull attack on the US, why hasn't anyone taken credit for it? if you got in a street fight with chuck liddell and knocked him out with one punch would you keep it to yourself?
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