During World War II and the subsequent Cold War some countries encouraged their citizens to become "plane spotters" in an "observation corps" or similar public body for reasons of public security.
第二次世界大戦と続く冷戦の間、いくつかの国は、市民が公安のために「観測団」または同様の公的機関で「飛行機の点検官」になるよう奨励した。