Plain English Meaning

Instead of talking to ATC by radio, the controller and pilot send short text messages back and forth through the airplane's communication system.

Full Definition

A digital text-based messaging system that allows air traffic controllers and pilots to exchange standard instructions, requests, clearances, and reports through data link rather than by voice radio.

Context Anchor

Seen in instrument procedure and communication notes where a departure, route, or airspace may use data- communication with ATC.