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。
For example, all a VFR pilot has to do to enter Class C airspace is establish two-way radio contact with ATC.
例如，VFR飞行员进入C类空域所要做的就是与空中交通管制建立双向无线电联系。
Uncontrolled airspace is designated Class F, while controlled airspace below 5,490m above sea level and not in the vicinity of an airport is Class E.
无交通管制的空域被定为等级F，而低于海拔5490米、不在机场附近的管制空域是等级 E。
The difference between Class E and A airspace is that in Class A, all operations are IFR, and pilots must be instrument-rated, that is, skilled and licensed in aircraft instrumentation.
E级和A 级空域的区别在于，在 A 级空域，所有操作都需遵照仪表飞行规则，飞行员必须要有仪表等级，也就是说，要有操作航空仪表方面的技术和执照。
The reason for the division of Class E and Class A airspace stems from the type of planes operating in them.
E类和A 类空域的划分取决于在这两类空域飞行的飞机类型。
The reason for the division of Class E and Class A airspace stems from the type of planes operating in them.
E类和A 类空域的划分取决于在这两类空域飞行的飞机类型。
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