Aeronautical Fixed Telecommunications Network (AFTN)
Aeronautical Fixed Telecommunications Network (AFTN) : The integrated worldwide system of aeronautical fixed circuits provided, as part of the aeronautical fixed service, for the exchange of messages between the aeronautical fixed stations within the network. Note: "Integrated" is to be interpreted as a mode of operation necessary to ensure that messages can be transmitted from an aeronautical fixed station within the network to any other aeronautical fixed station within the network