Answer:
Hijackers able to take over planes on September 11, 2001 by attacking passengers, disguised themselves as pilots, attacked flight crews, set off bombs.
All the options are correct.
On September 11, 2001, the hijackers were able to take over planes by using a combination of deception, planning, and violence.
The hijackers mostly disguised themselves as ordinary passengers, wearing civilian clothes, and passed the pre-boarding security procedure by carrying fake identification cards and hiding weapons and their affiliation with the terrorist organization.
They took control of the aircraft by surprise just before the flight took off or in some cases after takeoff. The hijackers then attacked the flight crews, overpowering them and taking control of the plane. In some cases, they set off bombs to force pilots to cooperate. In other cases, the hijackers used knives and box cutters to take over the aircraft as they had planned beforehand.
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