How to Identify Aircraft by Their Callsign

Once you start watching aircraft, the callsign is the key that unlocks everything else: the airline, the flight, and often the route. This guide explains how to identify aircraft by their callsign, so the strings of letters and numbers start to make sense.

What a callsign is

A callsign is the identifier an aircraft uses on the radio and in tracking systems. For airlines it is usually built from two parts:

1. A three-letter airline code (the ICAO code).
2. A flight number or alphanumeric suffix.

So BAW123 breaks down as BAW (British Airways) plus 123 (the flight). Once you know the airline code, you are halfway to identifying any flight.

Common airline codes

A few you will see often, especially in UK and European skies:

There are hundreds more, but a handful like these cover a large share of the traffic over Britain. For a deeper dive into what the codes mean and where they come from, see what aircraft callsigns mean.

Why some callsigns look unusual

You will often see callsigns like EZY45N rather than a simple number. Airlines use these alphanumeric callsigns to avoid confusion when several similar-sounding flights operate close together. Two flights called "EasyJet 123" and "EasyJet 132" are easy to mix up on the radio, so airlines assign distinct codes instead. The airline prefix stays the same, so you can still identify the carrier at a glance.

Private and general aviation

Not every aircraft belongs to an airline. Private planes, training aircraft, and many general aviation flights use their registration as the callsign. In the UK these start with G, for example G-ABCD. In the US they start with N. If you see a callsign that looks like a registration rather than an airline code, it is almost certainly a private or GA aircraft.

Callsign versus flight number

These two are related but not identical:

• The flight number is the commercial label on your ticket, such as BA123.
• The callsign is the operational identifier, such as BAW123.

We explain the relationship, and how route codes fit in, in how to read a flight number and route codes.

Let a tracker do the work

Memorising codes is fun for enthusiasts, but you do not have to. A flight tracker automatically links a callsign to its airline, route, and aircraft type. When PlaneTicker sees EZY45N, it shows easyJet in the airline's brand colours, along with the route and altitude.

This is exactly how a flight tracker display helps: glance at PlaneTicker Desktop and the callsign overhead is instantly translated into something meaningful. You can also try it free in the browser demo.

Putting it together

Next time you see an aircraft overhead, read the callsign, identify the airline from the first three letters, and note the flight number or suffix. Combine that with altitude and route, and you can tell a remarkable amount about the plane passing over your head. To go further, learn what plane is flying over your house right now.