Controlledairspace is that airspace in which FAA regulations apply.
管制空域是指适用 FAA 规定的空域。
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Uncontrolled airspace is designated Class F, while controlledairspace 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。
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On a clear day, a pilot in controlledairspace can choose a VFR or IFR flight plan, and the FAA regulations were devised in a way which accommodates both VFR and IFR operations in the same airspace.