The 9/11 planes couldn't do that damage shit it for morons. Do the math. Ke=1/2mv^2

Fully loaded 767 ~ 395,000 lbs

Velocity ~ 494 - 537 mph (gov estimates)

Force of impact = 3,222,390,202 ft/lbs

Yea, even if the plane is build like a beer can all that energy needs to go somewhere.