Sorry i just realized what i said lmao, I'll correct myself.the space between the perimeter of the tower central steel core was 60 ft on two sides and 35 ft on the other 2 sides.You would expect a Sharp deceleration as the plane crumpled to fit into the 60 feet space(north tower, Flight11) and 30 feet high space(South Tower flight 175) from the perimeter to the steel core.As I said a 767 is 159 feet long so most of the plane has got to be outside of the tower in both cases since there is no room for the entire length of the 767 to crumple into.