Question: How come the terrorists' knives were not noticed? Airports have metal detectors designed to detect knives.
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Answer: At the time of the 9/11 incident, certain type utility or pocket knives like the ones the terrorists brought on board were not illegal. Airport screeners had more leeway then about what type of knives, tools, or other gadgets they allowed passengers to carry on board. Since then, the restrictions are far more stringent.
raywest ★
I can attest to this as my father traveled on aircraft with his pocket knife multiple times before 9/11. As long as it was under a few inches; it was more viewed as a tool than a threat to the aircraft.