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“Mayday, Mayday, Mayday” – AeroTime’s guide to aviation emergency communications 

Aerotime

Nearly all aircraft are fitted with a piece of equipment called a transponder. An aircraft’s transponder (short for ‘ transmitter-responder ’) is an electronic device on an aircraft that transmits a four-digit code (commonly referred to as a ‘ squawk code ’) which allows the aircraft to be identified by ATC.