In aviation, what does PIREP stand for?

The correct term PIREP stands for Pilot Weather Report. This is a crucial communication tool in aviation that pilots use to relay real-time weather information to air traffic control and other pilot colleagues. PIREPs provide firsthand accounts of weather conditions encountered during flight, which can include visibility, turbulence, cloud cover, and other atmospheric phenomena. This information is vital for both current and future flights, helping to enhance overall flight safety and operational efficiency.

The other options do not accurately represent what a PIREP is. Preliminary Weather Report, for instance, does not reflect the nature of the report being a personal account from a pilot. Similarly, terms like Pilot In-Road Report and Personal In-Flight Report are not recognized in aviation terminology and do not convey the same authoritative and specific nature that a Pilot Weather Report does.