What is the function of a leader line in air traffic control communication?

The function of a leader line in air traffic control communication is to visually connect data and symbols in a block. Leader lines serve as visual aids that help clarify relationships between various elements presented on a map or chart. By connecting certain data points or symbols, they allow air traffic controllers to quickly interpret the information and ensure that actions and instructions are clear. This visual connectivity is critical for effective situational awareness and decision-making during air traffic operations.

In the context of air traffic control, options related to communication priority, air traffic flow direction, and emergency situation isolation do not accurately capture the specific role of leader lines, which is primarily focused on enhancing visual clarity rather than directly influencing traffic management or prioritization.