What does PNR stand for in aviation?

PNR stands for "Point of No Return" in aviation. This term refers to a specific point along a flight path beyond which the aircraft does not have enough fuel to return to its departure airport safely. It is a crucial concept for flight planning, as it helps pilots and flight planners determine the optimal route and necessary fuel requirements for a flight. Knowing the point of no return is important for ensuring the safety of the flight and making informed decisions during the journey.

In aviation, understanding when you reach this point is vital for managing the risk associated with fuel limitations, particularly in situations such as inclement weather or technical difficulties that may necessitate returning.