The North American air defense identification zone (ADIZ) is an area around the territories of the United States and Canada comprising airspace over land or water in which the ready identification, location, and control of civil aircraft is required in the interest of national security. This ADIZ is jointly administered by the civilian air traffic control authorities and the militaries of both nations, under the auspices of the North American Aerospace Defense Command or NORAD. The FAA handles the requests of international aircraft and Transport Canada handles Canadian requests. Any aircraft flying in these zones without authorization may be identified as a threat and treated as an enemy aircraft, potentially leading to interception by fighter aircraft.
An aircraft entering an ADIZ is required to radio its planned course, destination, and any additional details about its trip through the ADIZ to a higher authority, typically an air traffic controller. The aircraft must also be equipped with a radar transponder.
Read more about Air Defense Identification Zone: History, United States, Canada, Guam, Washington D.C.
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