[buccaneer81]

Noone thought a fully fueled plane would ram into a building filled with so much miscellaneous fuel (paper, furniture, etc.). If they had, they would have insulated the steel supports to prevent

The architects had designed for a Boeing 707 to collide with one tower. But not at 560 mph.

[burzum]

I am aware of that. The thing that destroyed the buildings, as far as I can recall, is that the heat from the combustion of the remaining jet fuel and the massive amounts of paper, furniture, and other flammables, allowed the deformation of steel beams inside the building. I think it was the inferno that destroyed the building, not the shock of an airplane impact. The buildings took the airplane impacts very well, but they couldn't withstand the fires afterward.

[editor-surveyor]

"The architects had designed for a Boeing 707 to collide with one tower. But not at 560 mph."

That's true, the 707s originally traveled at up to 700 MPH, but were slowed down by political correctness. They were also somewhat denser as projectiles, thus more capable of causing damage than current models.