What is a Prohibited Area, and what does 'P' mean on a chart?
Answer
A Prohibited Area is airspace of defined dimensions within which flight is completely prohibited for reasons of national security or welfare. They are published in the Federal Register and depicted on aeronautical charts with a 'P-' designation (e.g., P-40 over the White House).
AIM 3-4-2
Read the full regulation — AIM 3-4-2
3-4-2. Prohibited Areas 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.
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