在一些小机场，通用航空的合同制空中交通管制员在管制塔工作。
The towers are staffed by contract air traffic controllers at small airports that specialize in general aviation.
1919年，国际航空委员会(ICAN)成立，并开始制定空中交通通用规则。
In 1919, the International Commission for Air Navigation (ICAN) was created to develop General Rules for Air Traffic.
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