Just under the outer walls of the WTC was a steel frame. Pretty amazing how airplane wings could cut right through that and disintegrate inside the building instead of detaching from the fuselage and falling to the street below.
Put enough energy behind anything and you can shove it through anything. Look at what tornados can do at a fraction of the energy.
The government's calculations put the speed of the first plane at 494 mph, and the second at 586 mph. The MIT analysis determined the first plane was traveling 429 mph, and the second 537 mph.
This is only about 200 fps below a point blank .45 ACP, which would probably have a similar velocity at 200 yards. So imagine being hit with a quarter million lbs pistol bullet at 200 yards. That's correct but not totally fair since f=ma and you get lower 'a' with increasing dimension, like old movies faking distaster on scale models it's just different. But local effects are still the same. That plane is going to splatter on steel like a lead bullet, which is more or less like a water balloon.
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