Je kunt gebouwen simpelweg niet bestand maken tegen grote vliegtuigen op een dergelijke snelheid :
Les Robertson :
http://www.nytimes.com/2002/03/14/ny...pert-says.html
"The buildings
survived the impact of the Boeing 767 aircraft, an
impact very much greater than had been contemplated
in our design
(a slow-flying Boeing 707 lost in the fog
and seeking a landing field). Therefore, the robustness
of the towers was exemplary. At the same time, the fires
raging in the inner reaches of the buildings undermined
their strength. In time, the unimaginable happened . . .
wounded by the impact of the aircraft and bleeding from
the fires, both of the towers of the World Trade Center
collapsed."