M’aider Mayday Mayday

81D89153-275A-4AA7-9C0A-CAFD5283E491 M’aider
“Mayday” (m’aider is French meaning ‘help me’) is a life-threatening emergency voice signal primarily used by aviators and mariners, but also used by law enforcement and firefighters. It is always given three times in a row to ensure the message is clear. It was selected by Frederick Stanley Mockford, a London based senior airport radio officer, in 1923. In 1927, it officially replaced the Morse code distress call, SOS.
It is unrelated to the May Day holiday.

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