Which system is primarily tasked with preventing collisions between aircraft?

The primary purpose of the Air Traffic Control (ATC) system is to prevent collisions between aircraft. This is achieved through a combination of radar monitoring, communication with pilots, flight planning, and the enforcement of safe separation standards between flying aircraft. The ATC system works to ensure that air traffic flows safely and efficiently by providing instructions, clearances, and advisories to pilots, thus maintaining safe distances both vertically and horizontally between aircraft in controlled airspace.

While the Traffic Management Unit and Command Center play important roles in managing air traffic flow and coordinating operational strategies, their functions are more focused on optimizing traffic and addressing issues such as delays, rather than directly managing the prevention of collisions. Search and Rescue Operations, on the other hand, are emergency responses to locate and assist aircraft in distress, which is not a proactive measure for collision prevention. Thus, the assertion that the primary purpose of the ATC system is to prevent collisions aligns perfectly with the core objectives of air traffic management and safety protocols.