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Ok, so the temperature of burning jet fuel is less than that of melting steel.
The temperature of gas is less than that of melting steel too. But have you ever seen the metal frame of a building after a fire when an accelerant is used? The metal doesnt melt, no, but it becomes brittle enough to where I could take a relatively thick peice and bend it with my hands. Im no structural engineer, nor do I believe anyone on Zilvia is, but I can believe that such a large fire in an enclosed space can cause enough fatigue to the metal frame to cause a failure. I've seen it in arson in metal frame buildings (firefighter friends), so I don't doubt that it was the reason behind the WTC collapse.
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