How were hijackers able to take over planes on September 11, 2001?

Question

They attacked passengers.
They disguised themselves as pilots.
They attacked flight crews.
They set off bombs.

Answer 1

The hijackers were able to take over planes on September 11, 2001 by attacking flight crews and threatening them with weapons. They also used knives and boxcutters to gain control of the cockpit and hold passengers and crew members hostage. They did not disguise themselves as pilots or set off bombs during the attacks.