Also found in: Acronyms.
An airspace of defined dimensions identified by an area on the surface of the earth in which activities must be confined because of their nature and/or limitations must be imposed upon aircraft not a part of those activities. The various types of special-use airspaces are alert areas, where there is a high volume of pilot training activity or any other unusual activity that may be hazardous to aircraft; controlled firing areas, in which activities are conducted under conditions controlled so as to eliminate hazards to nonparticipating aircraft; military operations areas; prohibited and restricted areas; and warning areas. A warning area is an airspace of defined dimensions from 3 NM outward from the coast that contains activities that may be hazardous to nonparticipating aircraft. Except for controlled firing areas, special-use airspace areas are depicted on aeronautical charts.