Airspace Class (United States)

Airspace Class (United States)

The United States airspace system's classification scheme is to provide maximum pilot flexibility with 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.

The Albert ROPER (1919-10-13 The Paris Convention) implementation of International Civil Aviation Organization (ICAO) airspace classes defines Classes A through E and Class G. Class F is not used in the United States. The other U.S. implementations are described below. The United States also defines categories of airspace that may overlap with classes of airspace. Classes of airspace are mutually exclusive. 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.

Note: All airspace classes except Class G require air traffic control (ATC) clearance for Instrument flight rules (IFR) operations.