Imagine That
(media.greatawakening.win)
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Time is irrelevant.
You could put steel in a 2000 degree oven forever and it wouldn't melt because it simply isn't reaching the (much higher) melting point of 2500F.
The same wind that would bolster temperatures can also ferry the heat away, as would happen in that case as the buildings were not furnaces designed to trap heat and there were big gaping holes for it to escape through.
The strength of a plane aside, you are definitely correct that they only need to destroy rivets and other supporting structural objects, but the truth was never really said.
Also it is unlikely it would fall like a planned demolition as it did without significant aid.
You can bend a red hot iron bar, by hand that you couldn't bend when it was cold. Steal loses much of its strength far below its melting point,and to be honest it would extremely hard to come up with the temperature of that fire without doing an actual experiment on a similar building.
And it very well could have been helped by dynamite, I have no evidence or opinion on that.
What I do know is that yesterday, I removed a large skin off the wing of large aircraft, and I used a crane. I set it on the ground and it took 6 men to lift one side and flip it over. That skin was made of 7075 t- 6 aluminum, it's damn near as hard as steel......