It's unsure whether this question can ever be answered accurately because of the collapse of the Twin Towers. There would be no discernible way to segregate those who jumped from those who were otherwise caught in the disaster.
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4 - Flight 11 hit the North Tower (Tower 1), Flight 175 the South Tower (Tower 2), Flight 77 collided with the Pentagon and Flight 93 crashed in Pennsylvania. http://www.kerman94.com/911-Flights.HTM
2001
no but he was behind 911
who cares - its history
19 terrorist