Some passengers aboard the ill-fated hijacked planes yesterday made final calls to their loved ones and emergency services.
A female passenger aboard the Boeing 767 which crashed near Pittsburgh reported that the passengers, crew and pilot were forced to the back of the plane while the hijackers took over.
A male passenger on the same flight, who had locked himself into a toilet, said he could see white smoke coming from one side of the plane.
A passenger aboard another plane, believed to be that which slammed into the World Trade Centre, told how men wielding knives had taken over the aircraft and had stabbed a stewardess.