3d model new york world trade - World Trade Center by 9MBI.com

The two towers were unable to survive the effects of a direct hit by two hijacked commercial jetliners during terrorist attacks on the morning of September 11, 2001. Although they were in fact designed to withstand being struck by an airplane, the resultant fires weakened the infrastructure of the building, collapsing the upper floors and creating too much load for the lower floors to bear. Shortly after the attack, both towers collapsed.