I've been looking around in beardedbruce's linked page. We can see in images of the WTC, that the airplane's wings made a perfect wing-shaped hole (all the way to the very narrow tip of the wing) in steel and concrete, but beardedbruce and his linked page are saying that an aluminum wing of an airplane cannot leave a wing-shaped hole in limestone and brick.

I'd like to see an explanation of why they are willing to accept aluminum going through steel and concrete but not limestone and brick.