Which CFR regulates aircraft operating near other aircraft?

The correct regulation governing aircraft operating near other aircraft is found in CFR 91.111. This section addresses the requirements for maintaining safe distances between aircraft to prevent collisions and ensure safe operations in the vicinity of other aircraft. It specifically delineates the responsibilities of pilots regarding altitude separation and the necessary actions to avoid hazardous proximity to other flying aircraft.

By focusing on these regulations, pilots are urged to maintain vigilance and adhere to specified protocols, which include giving way to other aircraft under certain conditions, especially when operating in controlled or congested airspace. This regulation serves as a critical safeguard for aviation safety, emphasizing the importance of situational awareness and adherence to established procedures when flying in proximity to other aircraft.

Other options may relate to different aspects of aircraft operation, such as operational limits during visibility limitations or specific conduct during takeoff and landing, but they do not directly regulate the interaction between aircraft in airspace.