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If the first tower was struck why wouldn't they evacuate the second tower knowing there would be a chance that that tower might be hit too. instead they told everyone to return to the tower
United Airlines Flight 175
UAL Flight 175 took off from Boston’s Logan Airport at 7:58. Its planned route was south-west to northwestern New Jersey, then a gentle right turn to follow a more westerly course towards Los Angeles International Airport. The plane followed this route until the point where it was to bear right; instead, it turned left about 45 degrees to travel southwards towards central New Jersey, then made a sharp left over Middlesex County to approach New York Harbor from the south. This plane hit the South Tower of the World Trade Center at about 9:05 AM.
Note that Flight 175's legitimate pilots must have been in control until about the time the plane crossed the northern New Jersey border; up to this time the plane had followed its planned route, including turns that the hijackers would not have had the navigational skills to make (and which were not essential in order to fulfill their mission). Also, note that the hijack did not occur until a point at which a passenger on the left side of the plane would have had a clear view of the Twin Towers. From this point on, it was easy to navigate the airplane by this obvious landmark – and target.
The hijackers of this flight clearly knew that its route would take it within about 50 miles of Manhattan – close enough to use the Twin Towers as a visual landmark. Thus, they could sit back and wait until they had a clear view of their target. One obvious conclusion is that the hijackers had taken the flight before and knew the visual characteristics of the flight path.