In 1977, William Landes published a classic study of crime and punishment. He investigated what happened to the number of hijackings in the USA after mandatory screening of passengers and their carry-on luggage was introduced in 1973.
During the peak period of hijackings, 1968 to 1972, the probability of apprehension the hijacker was 15%. For those hijackers that were caught, their average prison sentence was 30 years in 1972 to 1974. One quarter of hijackers were committed to mental institutions. Hijackings became so common that:
[a]irliners carried approach plans for the Havana airport and crews were instructed not to resist hijackers. There were also standard diplomatic procedures for obtaining the return of planes and passengers
No hijackers were killed during the course of their crimes until 1971. After that, there is about a 10% chance of the hijacker being shot dead. Air marshals started riding on US planes in 1970…
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Utopia, you are standing in it! 
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