The scale of the September 11 attacks was greater than most predictions (given that no terrorist attack in history had ever been that destructive) but planes in

The scale of the September 11 attacks was greater than most predictions (given that no terrorist attack in history had ever been that destructive) but planes into buildings and terrorist attacks on the WTC were frequently predicted events. The Empire State building has been hit multiple times by planes including a serious incident involving a B-25 in 1945: http://en.wikipedia.org/wiki/B-25_Empire_State_Building_crash http://en.wikipedia.org/wiki/B-25_Empire_State_Building_cras... and the WTC had been the subject of multiple previous bombings: http://en.wikipedia.org/wiki/1993_World_Trade_Center_bombing http://en.wikipedia.org/wiki/1993_World_Trade_Center_bombing Planes attacking buildings – especially the World Trade Center – is certainly something that had been imagined.