To enter Class B airspace, such as an approach to a major metropolitan airport, an explicit ATC clearance is required.
需要持有明确的空中交通管制许可才能进入B类空域，如接近一个大都会机场。
B No. Luckily my friend picked me up at the airport and gave me a lift home.
B不。幸运的是我的朋友开车到机场接我回家。
B No. Luckily my friend picked me up at the airport and gave me a lift home.
B不。幸运的是我的朋友开车到机场接我回家。
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