What defines Class E airspace?

Class E airspace is defined as controlled airspace that does not require a special clearance for a pilot to enter. This type of airspace begins at a specified altitude and extends upwards, but pilots can operate within it without needing prior authorization, as is required for some other airspace classifications like Class B or Class C.

Class E is primarily utilized for instrument flight rules (IFR) operations and can encompass various altitudes, starting as low as 700 feet above the surface in certain areas. This classification allows for more flexibility, especially for general aviation and VFR (visual flight rules) traffic that can coexist with IFR traffic, which is often managed by air traffic control when operating within the airspace.

The other options reflect misunderstandings of Class E airspace. For instance, Class E does not require special clearances (hence it being classified differently from Class A, B, and C), nor is it reserved solely for military operations as pertains to certain airspace restrictions. While some may view uncontrolled airspace as not requiring entry permissions, such spaces are typically classified as Class G, which is distinct from Class E.