What is a requirement for operating under Visual Flight Rules (VFR)?

The requirement for operating under Visual Flight Rules (VFR) is having visual cues outside the aircraft. This means that the pilot must be able to see and avoid obstacles, terrain, and other aircraft while flying. Visual references are crucial for safe navigation and ensuring that the pilot can maintain spatial awareness during flight. VFR is designed for scenarios where pilots can operate by visual reference rather than relying solely on instruments.

Other options, such as flying below 10,000 feet or being on autopilot, do not accurately represent a core requirement of VFR, as there are numerous scenarios where VFR is applicable at various altitudes and in manual or automated flight. Similarly, while prior clearance from Air Traffic Control (ATC) may be necessary in certain airspace situations, it is not a universal requirement for operating under VFR.