What is the definition of Class E airspace?

Class E airspace is defined as any controlled airspace that is not categorized as Class A, B, C, or D. This encompasses a wide range of airspace, typically found above Class G airspace and at controlled airports when the ceiling of Class D does not reach to the surface. The main function of Class E airspace is to serve as a transition area to higher classes of controlled airspace and to provide an additional level of control for certain flight operations, particularly those occurring at altitudes where visual flight rules (VFR) and instrument flight rules (IFR) may intersect.

In this context, Class E airspace is essential for pilots because it allows for IFR operations in airspace where the ceiling is too low for Class A operations, and where there is a lack of the more stringent regulations found in Class B, C, or D airspace. This classification enables safe integration of different aircraft operations.

The other options do not accurately describe Class E airspace. For instance, Class A airspace specifically refers to high-altitude airspace primarily used for IFR flights, while the definitions for Classes B, C, and D each refer to specific configurations and types of controlled airspace with their own operational requirements. Uncontrolled airspace not