In the UK, official call signs are typically allocated to squadrons or specific flights, meaning that a particular call sign might apply to different pilots at different times depending on the aircraft or mission they are flying.
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Aircraft Call SignsFor example, a pilot flying a large transport aircraft might be given the call sign “Heavy,” while a pilot flying a fighter jet might be given the call sign “Eagle” or “Hornet.” This is also true for commercial aviation.
Most general aviation pilots use their aircraft registration (N number) as the call sign for air traffic control (ATC) communications and filing flight plans.