The best replacement for mayday is sos.

The best alternatives to mayday are rated as following:
★★★★★  sos
★★★  pan
★★★  panpan
★★  air crash investigation
★★  mainstay
★★  broadchurch
★★  may day
★  ultra pro
★  pan pan
  pon pon
  datrex

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Google Trends

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mayday
sos
pan