The reason for the division of ClassE 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。
2
Uncontrolled airspace is designated Class F, while controlled airspace below 5,490m above sea level and not in the vicinity of an airport is ClassE.
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。
3
The difference between ClassE 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。