‘Until the late 1940s newspapers were the primary method of delivering the news. In addition to normal daily papers Extra’s were published when something big happened. These were sold on the street by newsboys.
Today (as well as in 2001) radio, television and internet have become the primary methods of delivering the news. Extra’s are only printed in case of major unexpected events. 9/11 was such a major news event. The first jet flew into the Twin Towers at 8:46 a.m, which gave newspapers enough time to issue Extra’s.’ (via)