I'm not considering the density of Pentagon vs density of the Plane. I'm comparing the effects of those three plane crashes I wrote about earlier with the one at Pentagon, and i don't know how to explain why so little damage was done to Pentagon, but clearly there is something wrong with it. Conspiracy...? I don't know... Actual plane crash...? Then why so little damage was done?
How was there so little damage? Simple.
1. There is a difference when an aircraft flying at ~ 240 m/s impacts an object ~ 250 meters above ground basically moving horizontally at such velocity versus an aircraft coming at an angle of ~ 20 degrees and impacting an object close to the ground of greater density and lesser elasticity. Fact of the matter is the WTC had less density and greater elasticity simply because it was so far above ground.
2. From the link I just quoted:
Q: It broke through which one?
Evey: The rings are E, D, C, B and A. Between B and C is a driveway that goes around the Pentagon. It's called A-E Drive. The airplane traveled in a path about like this, and the nose of the aircraft broke through this innermost wall of C ring into A-E Drive.
Q: One thing that's confusing -- if it came in the way you described, at an angle, why then are not the wings outside? I mean, the wings would have shorn off. The tail would have shorn off. And yet there's apparently no evidence of the aircraft outside the E ring.
Evey: Actually, there's considerable evidence of the aircraft outside the E ring. It's just not very visible. When you get up close -- actually, one of my people happened to be walking on this sidewalk and was right about here as the aircraft approached. It came in. It clipped a couple of light poles on the way in. He happened to hear this terrible noise behind him, looked back, and he actually -- he's a Vietnam veteran -- jumped prone onto the ground so the aircraft would not actually -- he thinks it (would have) hit him; it was that low.
On its way in, the wing clipped. Our guess is an engine clipped a generator. We had an emergency temporary generator to provide life-safety emergency electrical power, should the power go off in the building. The wing actually clipped that generator, and portions of it broke off. There are other parts of the plane that are scattered about outside the building. None of those parts are very large, however. You don't see big pieces of the airplane sitting there extending up into the air. But there are many small pieces. And the few larger pieces there look like they are veins out of the aircraft engine. They're circular.
<edit>changed 800 m to 250 m. was thinking in feet</edit></edit>second edit for clarity</edit>