Air Defense Identification Zone
The United States formally defines an ADIZ in the Code of Federal Regulations: 14 CFR Part 99. The ADIZ forms a transition zone in which aircraft come under positive identification and control by air traffic and defense authorities. With regards to applicability of the law, states "This subpart prescribes rules for operating civil aircraft in a defense area, or into, within, or out of the United States through an Air Defense Identification Zone (ADIZ), designated in subpart B".