What is the distinction between "MAYDAY" and "PAN PAN"?

"MAYDAY" and "PAN PAN" serve different purposes in aviation communication, highlighting the seriousness of the situations they represent. "MAYDAY" is an emergency distress call indicating that a vessel or aircraft is in imminent danger and requires immediate assistance. This term conveys a critical situation where the life of individuals or the safety of the aircraft is at risk.

On the other hand, "PAN PAN" signals an urgency but does not indicate that immediate action is required. It is used to communicate situations where safety is at risk, but the circumstances are not life-threatening. For example, this could include technical issues that do not require emergency measures but still need attention.

The distinction is essential for prioritizing responses and resources from air traffic control and other relevant bodies. Hence, it's clear that "MAYDAY" indicates distress, while "PAN PAN" indicates urgency.