ADIZ (Air Defense Identification Zone)

An area of airspace over land or water within which the identification, location, and control of aircraft is required in the interest of national security. All aircraft entering a domestic or coastal ADIZ must file a DVFR or IFR flight plan, be equipped with a functioning transponder with altitude reporting, and maintain two-way radio communication with ATC. The ADIZ surrounding the contiguous United States, Alaska, Hawaii, and Guam is defined in 14 CFR Part 99. Failure to comply with ADIZ procedures can result in military intercept.