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How were hijackers able to take over planes on September 11, 2001?
1) They attacked passengers.
2) They disguised themselves as pilots.
3) They attacked flight crews.
4) They set off bombs.
The Hijackers attacked the pilots and other crew. The Hijackers had gotten fight lessons and got their pilots license before boarding the plane which they were passengers but they managed to bring weapons aboard the plane.
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