also use the term. Convention requires the word be repeated three times in a row during the initial emergency declaration ("Mayday, mayday, mayday").

History

The "mayday" procedure word was conceived as a distress call in the early 1920s by Frederick Stanley Mockford, officer-in-charge of radio at Croydon Airport, England. He had been asked to think of a word that would indicate distress and would easily be understood by all pilots and ground staff in an emergency. Since much of the air

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