Plain English Meaning
A specific block of airspace where aircraft are not allowed to fly at all. The boundaries are published on charts, and entry is forbidden by federal regulation.
Full Definition
Airspace of defined dimensions, designated by regulation, within which the flight of aircraft is prohibited. Prohibited areas are established for security or other reasons associated with the national welfare and are depicted on aeronautical charts with a 'P' followed by an identifying number (for example, P-56 over the White House and U.S. Capitol).
Context Anchor
Pilots encounter prohibited airspace during route planning, chart review, and when checking whether a planned crosses .