A. In dangerous Situation
B. Calling for Help
C. Passengers are in panic
D. Aeroplane is in danger.
Explanation:
The Mayday call originated in 1920s. A senior radio officer at London’s Crydon Airport. Frederick Stanley was the first person to use this signal to indicate emergency situation. Basically Mayday is derived from a French word Maidez which means help me help me.



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