Plain English Meaning
A messaging system that lets the aircraft and people on the ground send short text messages back and forth automatically, without having to talk on the radio.
Full Definition
A digital datalink system that allows aircraft to exchange short text-based messages with airline operations, air traffic services, and ground stations over VHF, HF, or satellite radio links. It is used to send and receive operational information such as flight plans, weather, clearances, position reports, and aircraft system status.
Context Anchor
Seen in flight plan equipment codes, especially when describing an aircraft’s or - capability.