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Originally Posted by Infinite_Loser
They even considered the possiblility of airplane collision. However, both towers collapsed within 90 minutes.
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They only considered a 707 hitting them, but what is really different about a 707 and a 767? A few more gallons of jet fuel? A few feet more from wing to wing? Even with the 707 hitting them, you would have had the jet fuel fires and the fire-proofing getting blown off.
I guess they might have just looked at it from the point that the towers remained standing for some period of time after the crash, and did not instantly fall down.