It was Leslie Robertson who said the design incorporated a possible low velocity impact from a 707 and as Charlie mentioned, it excluded calculations for fire damage.<quoted text>What about the designer of the Trade Towers who said the Towers could withstand a 707 crashing into them? Looks like he was proven to be wrong and perished in one of the two towers. So much for the opinion of Architects and Engineers.
Frank Demartini was the person who said the towers could withstand multiple air strikes without falling.
Sadly, he passed away in the collapses and twoofers have been abusing his memory ever since.