The crash immediately killed everyone on board Flight 11 and an unknown number in the plane’s path. But that was only the beginning. As the plane blasted through the tower’s core, it crushed the walls of all three emergency stairwells in its path, cutting off stair access to everyone on the 92nd floor and above. At the moment of impact, an estimated 1,355 people were inside those nineteen uppermost floors. That included roughly two hundred people dining or working at Windows on the World and attending a technology conference on the 106th floor. The survivors on those floors had no way down and
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