Besides controlled and uncontrolled airspace, other types of airspace include "special use" and "other airspace". Within these categories exist: controlled (classes A, B, C, D, and E) and uncontrolled (class G) airspace, based on which air traffic control service is provided to IFR flights and some VFR flights. ![]() In the U.S., airspace is categorized as regulatory and non-regulatory. Note: All airspace classes except class G require air traffic control (ATC) clearance for instrument flight rules (IFR) operations.Īirspace classes in the United States Airspace classes Thus, airspace can be "class E" and "restricted" at the same time, but it cannot be both "class E" and "class B" at the same location and at the same time. Classes of airspace are mutually exclusive. The United States also defines categories of airspace that may overlap with classes of airspace. The Albert Roper ( The Paris Convention) implementation of International Civil Aviation Organization (ICAO) airspace classes defines classes A through G (with the exception of class F which is not used in the United States). ![]() The United States airspace system's classification scheme is intended to maximize pilot flexibility within acceptable levels of risk appropriate to the type of operation and traffic density within that class of airspace – in particular to provide separation and active control in areas of dense or high-speed flight operations. ![]() For a general discussion of airspace classes, see Airspace class. This article is about implementation of International Civil Aviation Organization airspace classes in the United States of America.
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