What does OTP stand for in aviation terminology?

The term "VFR on top" refers to a situation in aviation where an aircraft operating under Visual Flight Rules (VFR) is flying above a layer of clouds or overcast conditions while receiving air traffic control (ATC) services. This allows the pilot to maintain visual reference to the ground or horizon while still benefitting from the safety and guidance provided by ATC.

Understanding "VFR on top" is significant for pilots because it emphasizes the need to operate safely within legal VFR parameters, even when flying above poor weather conditions. Pilots flying VFR on top must remain aware of their altitude and the associated airspace rules, ensuring they still adhere to VFR navigational guidelines while being under the jurisdiction of ATC.

The other options, while related to aviation operations, do not capture this specific blend of visual navigation combined with air traffic control oversight, which is central to the meaning of VFR on top.