Twin Towers' Designers Anticipated Jet Impacts Like September 11th's - According to Hyman Brown, a University of Colorado civil engineering professor and the World Trade Center's construction manager, 1 and 2 World Trade Center were designed to survive an impact and resulting fires from a collision by the largest commercial aircraft at the time, a Boeing 707-340. 1 Contrary to widely promoted misconceptions, the 767-200s used on 9-11 were only slightly larger than 707s. https://web.archive.org/web/20031209185213/https://911research.wtc7.net/wtc/analysis/design.html
