What is the rule regarding operation near other aircraft in flight?

The rule regarding operation near other aircraft in flight emphasizes the necessity of not creating a collision hazard. This is fundamental to aviation safety, as all operators must be aware of their surroundings and ensure that their actions do not interfere with other aircraft. Maintaining safe separation and avoiding potential conflicts is crucial for the safe operation of all aircraft, including lighter-than-air vehicles.

The other options do not align with established aviation principles. Operations must always prioritize safety, and not all flight maneuvers are authorized regardless of proximity to other aircraft. Coordination with air traffic control, while often necessary in controlled airspace, is specifically context-dependent and not an overarching requirement for all flight operations. Weather conditions can influence flight operations, but they do not dictate the general rule concerning the proximity of aircraft in flight.