The first passenger to reveal him/herself as a terrorist on a plane will be overrun by all the other passengers in SECONDS. This is the simple but powerful fact that any American passenger confronted with terrorism on their plane will meet the threat with extreme prejudice without regard for their own safety. Anyone who believes four dudes with box cutters can ever again successfully hijack an American plane is just not rooted in reality regardless of current (IMO extreme and unwarranted) screening measures.”]
Source: https://gizmodo.com/tsa-heres-what-you-need-to-know-about-airport-security-5696569