I don't think people realize just how common hijackings were in the early 1970s, with sometimes two hijackings on the same day. (Between 1968 and 1972 there wer

I don't think people realize just how common hijackings were in the early 1970s, with sometimes two hijackings on the same day. (Between 1968 and 1972 there were over 130 US hijackings.) But after a hijacker threatened to crash a plane into a nuclear reactor in 1972, the FAA introduced passenger screening and metal detectors. Before that, there was basically no security. An interesting article: https://www.vox.com/2016/3/29/11326472/hijacking-airplanes-egyptair https://www.vox.com/2016/3/29/11326472/hijacking-airplanes-e...