Which system assists pilots in avoiding other aircraft?

The correct answer is the Automatic Dependent Surveillance–Broadcast (ADS-B). This system plays a crucial role in enhancing situational awareness for pilots by providing real-time information about the aircraft's position, velocity, and other flight data. ADS-B operates by automatically broadcasting an aircraft's position derived from satellite-based Global Positioning System (GPS) data, along with other pertinent flight information. This broadcast can be received by other aircraft and ground stations, thus allowing pilots to see the positions of surrounding aircraft in a timely manner.

Through the use of ADS-B, pilots can effectively avoid potential collisions and maintain safe separation from other aircraft, which is essential for flight safety. This capability is especially vital in busy airspaces and during operations in low-visibility conditions where pilots may not be able to see other aircraft visually.

The other systems mentioned do serve valuable functions within aviation but do not specifically focus on collision avoidance in the same direct manner that ADS-B does. The Flight Data Input System, Route Management System, and Aircraft Communication Addressing and Reporting System have their own roles, such as managing data inputs for flight planning or facilitating communication, but they do not provide the same level of awareness regarding nearby aircraft as ADS-B does.