Callsign

Callsign

Callsign

An identifier used by air traffic management to distinguish an Aircraft during communication and tracking. The callsign for a FlightLeg is specified in the FlightPlan. Multiple flight legs may have the same callsign on the same day, even for Flights between the same Airports, but not at the same time.

Callsigns in aviation are derived from several different policies, depending upon the type of flight operation. In most countries, unscheduled general aviation flights identify themselves using the callsign corresponding to the aircraft's registration number (AircraftRegistration) .  Commercial operators, including scheduled airline, air cargo and air taxi operators, will usually use an ICAO or FAA-registered call sign for their company. These will typically consist of the ICAO code of the operating airline followed by a flight identification. The flight identification is very often the same as the flight number, but could be different due to callsign confusion, if two or more flights close to each other have similar flight numbers (i.e. KLM649 and KLM645 or BAW466 and BAW646) and also sometimes may contain letters to deconflict similar callsigns and numbers e.g. U2643 is EZY689D (2.12.2025 LTN-BFS).

Approved

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AircraftCallsign (EU Supplement)

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