Definition
An area of airspace over land or water in which the ready identification, location, and control of all civil aircraft is required in the interest of national security. Aircraft operating in or transiting an ADIZ must file a flight plan, maintain two-way radio communication, and report position as required, regardless of whether the flight is conducted under VFR or IFR.
Plain English
A zone of airspace where the military needs to know who you are, where you are, and where you are going. If you fly into one, you must be on a flight plan, talking on the radio, and reporting your position.
Context Anchor
Pilots encounter ADIZ information on aeronautical charts, in route planning, and in procedures for flights near certain U.S. coastal or border areas.
Derivation
The name describes its purpose directly: a zone where aircraft must be identified for the country's air defense. Established during the Cold War to give the military time to detect and intercept unknown aircraft approaching U.S. territory.
Why Pilots Care
Pilots must file a flight plan and maintain contact with air traffic control or risk military interception.
Intuition Check
An ADIZ is not automatically a no-fly area. It is an identification area: you may be allowed to fly there, but you must follow the required procedures so authorities know who and where you are.
Example Sentence 1
Before departing for the Bahamas, the pilot filed a DVFR flight plan and obtained a discrete transponder code to satisfy ADIZ requirements.
Example Sentence 2
ATC confirmed the aircraft's position and identity while it transited the ADIZ.