I am wondering why there haven't been (at least to my knowledge) rigorous computer simulations of the effects fully fueled 767's would have when crashing into the twin towers at the same angles and velocities as they did on 911. Such a study should be able to predict (based on the original tower blueprints and load bearing abilities of the steel) with mathemetical rigor the results such an attack would likely have on the building's structure (i.e. localized damage vs. total collapse). Isn't this well within the reach of present day computer modeling? I am aware of Prof. Jones study, but am hoping for a visual presentation that would have greater reach with the general public. Any Physics majors out there willing to give it a shot?