MOD WARNING ISSUED HERE Here is a logical explanation as to why the wing shaped gashes in WTC1, 2 are totally impossible. In the history of commercial aviation, there have been mid-air collisions between relatively small aircraft and the much larger commercial aircraft. These collisions always resulted in catastrophic damage to both aircraft. The fact is that if the large commercial airliner were so super sturdy, it would have simply pushed out of the way the smaller ( in some cases only 2% of the mass of the larger aircraft ) and that would be that, however, the fact of the fundamental physics of the collision show clearly that there would have to be a huge amount of energy expended in said collision. with this said, what super-duper special conditions prevailed on 9/11/2001 to allow an airliner to displace tons of mass, and incur no catastrophic damage to itself in the process? and to those who insist that the damage was confined to the point of contact with the wall, do you understand the stress that is imposed upon an airliner under very serious deceleration? a decrease of speed from 240 m/s to 235 m/s in 0.005 sec = >100 g for deceleration force, that is for each and every ton of anything contained in the airliner there would be >100 tons of force against whatever was supposed to be holding it in place.