Aeronautical Information Manual
AIM 3-4-4
Warning Areas
This reproduces published FAA reference text for study. It does not replace the current official FAA publication or regulation.
A warning area is airspace of defined dimensions, extending from three nautical miles outward from the coast of the U.S., that contains activity that may be hazardous to nonparticipating aircraft. The purpose of such warning areas is to warn nonparticipating pilots of the potential danger. A warning area may be located over domestic or international waters or both.
Retrieved from ecfr.gov on July 20, 2026.