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Originally Posted by Ryan Dognaux
The towers were by design made to withstand a 707 flying into it, which was the biggest plane at the time.
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True, but according to an interview with the original architectural team that I saw on TV, they only considered the impact load (of some tons of aluminim hitting the structure), and had failed to consider the fire effects from the fuel load. The terrorists used planes will relatively high fuel loads, and ~24000 pounds of fuel can make for a big fire.
Don