Map of airport clearance limit and obstacle location serves as a special one to understand and promote the relation between clearance limits and obstacles.

机场净空限制面及障碍物位置图，是了解掌握限制面和障碍物关系的专业地图。

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The overall plan and the detailed plan of airport areas must meet the State's technical standardized requirements of airport clearance protection and flight safety.

机场地区总体规划和详细规划应当符合国家有关机场净空保护和飞行安全的技术规范要求。

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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。

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An extra 90 people meanwhile are hired by the airport just to assist with snow clearance during winter months.

CNN: How airports beat bad weather

Heathrow airport has tripled the number of snow clearance vehicles to tackle severe winter weather.

BBC: Heathrow airport triples snow clearance fleet

Before, clearance on shipments at the Amman airport was done manually and often took two days.

FORBES: Monarch on a Mission