atn

ATN is an acronym that may refer to several different concepts across different domains. The most established meaning is Aeronautical Telecommunications Network, a framework for data communications in civil aviation developed under the International Civil Aviation Organization. The ATN provides the infrastructure for air-ground and ground-ground data exchanges, enabling services such as Controller–Pilot Data Link Communications and other digital messaging between aircraft, air traffic control, and airline operations centers. It is designed to interconnect national air traffic management systems with aircraft avionics and with airline networks, and its architecture has evolved toward IP-based delivery while retaining compatibility with legacy protocols in many regions.

In addition to aviation, ATN can denote various organizational names, research initiatives, or project networks that independently adopt the same acronym. Because the same letters can stand for different phrases, the exact meaning of ATN is highly context-dependent. When encountering ATN in a document, locating a glossary, expansion, or related terms is the best way to determine the intended meaning.