what weapons did the hijackers use to take control of the planes

The hijackers on the planes during the 9/11 attacks primarily used small knives (with blades about 3.5 inches or less) and box cutters to take control of the aircraft. They also reportedly used pepper spray or Mace, and there was the threat of bombs, but no firearms were found or reported being used. The knives and box cutters were allowed on planes under the security rules at the time, as knives under 4 inches were permitted. The hijackers exploited these relaxed rules and passed through security without having their knives inspected or confiscated. They used these weapons to stab crew members and take control of the cockpits, ultimately hijacking the planes.