What is unicom?

Unicom refers specifically to a common radio frequency used at uncontrolled airports, enabling pilots to communicate with one another as well as any ground personnel. This allows for coordination of aircraft arrivals and departures in environments where air traffic control services are not present. It serves as an essential tool for enhancing safety and efficiency at airports that do not have an operating control tower, allowing pilots to announce their intentions and maintain situational awareness.

While other choices mention various aspects of aviation operations, they do not accurately capture the specific function and relevance of Unicom in the context of airport operations, particularly in uncontrolled environments where it facilitates communication among pilots.