What defines Class E airspace?

Class E airspace is defined as controlled airspace that is not classified as class A, B, C, or D. This category of airspace encompasses a variety of operational environments and is designed primarily for the purpose of providing air traffic control services to a broad range of aircraft, including both IFR (Instrument Flight Rules) and VFR (Visual Flight Rules) operations.

The defining characteristics of Class E airspace include its floor, which can start at the surface, a defined altitude, or higher depending on the area. It is particularly important for transitioning aircraft as they move from uncontrolled to controlled airspace, and it serves as a buffer zone to maintain separation between differing types of air traffic. Additionally, Class E airspace supports the structures of airways and allows for more flexible and efficient air travel management.

Understanding that Class E is distinct from A, B, C, and D airspace helps pilots and aviation professionals comprehend the various air traffic control jurisdictions and requirements that govern different types of airspace, enhancing safety and operational efficiency in the national airspace system.