do you guys understand that the only real dense part of an aircraft is the engines? the plane itself is nothing more than a aluminium tube, so travelling at top speed into the pentagon, there would be some damage where the main body hit (it would crumple up and burn) then the holes where the engines flew into. the Pentagon is not made up of the same material as the wtc, so it could stand up to the impact better than the wtc, so less damage. not putting anyone down in this post, just adding my two cents
