The reason 9/11 was possible was that pre 9/11 passengers on aircraft were expected to cooperate a wait for authorities and hostage negotiators. Post 9/11 that’

The reason 9/11 was possible was that pre 9/11 passengers on aircraft were expected to cooperate a wait for authorities and hostage negotiators. Post 9/11 that’s not a thing that people will allow happen, but now even if they did, breaking into cockpits is essentially not possible - as evidenced by the pilot murder/suicides that now require at least two people in the cockpit at all times. The most common reason for guns and threats of gun usage on flights in the last decade of us flights have been us air marshals getting in arguments, or simply leaving their guns lying around aircraft. The TSA theater is BS that has nothing to do with making people safer, so the existence of an actual threat isn’t relevant.