AIM Text
Prohibited areas contain airspace of defined dimensions identified by an area on the surface of the earth within which the flight of aircraft is prohibited. Such areas are established for security or other reasons associated with the national welfare. These areas are published in the Federal Register and are depicted on aeronautical charts.
Source: FAA Aeronautical Information Manual · current edition · paragraph 3-4-2.
The short answer
This AIM section gives FAA advisory guidance on prohibited areas—airspace of defined dimensions within which the flight of aircraft is prohibited. Such areas are established for security or other reasons associated with the national welfare. They are published in the Federal Register and depicted on aeronautical charts, marking the most restrictive category of special use airspace.
Research Notes
Common Questions
What is a prohibited area?
Per this AIM guidance, a prohibited area is airspace of defined dimensions identified by an area on the surface of the earth within which the flight of aircraft is prohibited.
Why are prohibited areas established?
The AIM states prohibited areas are established for security or other reasons associated with the national welfare. They represent areas where aircraft flight is barred outright.
Where are prohibited areas published and shown?
According to the AIM, prohibited areas are published in the Federal Register and are depicted on aeronautical charts so pilots can identify and avoid them.