Jet fuel isn't ignited all at once so it wouldn't burn through **** all. I would expect if my car engine ignited all it's petrol at once there might be some damage.
And the witnesses who saw Molten "Steel" running out of the buildings, including Fire Crews etc, were they "experts" on what metal looks like in a Molten State or was "Molten Steel" simply a guess?
If I hold a lighter to my finger for a split second it doesnt burn, If I do it for a minute I'm sure it would burn it to ****