An Aeronautical Fixed Telecommunication Network (AFTN) address is a standardized eight-letter structural code used worldwide within civil aviation communications for routing critical operational messages. The address format consists of a four-letter ICAO location indicator designating a specific airport or facility, followed by a three-letter code identifying the targeted organization or service, and a final padding or departmental letter. These addresses ensure the secure exchange of flight safety data, weather reports, and air traffic services.