Final answer:
An individual responsible for notifying authorities like ATC, FSS, CARS, or RCC if an aircraft is overdue is detailed in the flight itinerary agreement for safety measures.
Step-by-step explanation:
The term in question refers to a responsible person designated in a flight itinerary agreement who has the obligation to ensure that appropriate authorities are alerted if an aircraft becomes overdue. This person must notify either an Air Traffic Control (ATC) unit, a Flight Service Station (FSS), a Community Aerodrome Radio Station (CARS), or a Rescue Coordination Centre (RCC), depending on the stipulations in the Section described.
The responsible person plays a critical role in aviation safety by ensuring that in the event of an aviation incident, there is someone on the ground prepared to initiate search and rescue operations by providing vital information about the flight's plans. This quick response can be crucial in locating an aircraft and providing assistance.