Which tool assists controllers in maintaining records of aircraft movements?

Flight data recorders are vital tools for air traffic controllers as they assist in maintaining comprehensive records of aircraft movements. These devices continually capture and store data regarding various parameters of the flight, including altitude, speed, heading, and other critical information pertaining to the aircraft's operation during its journey. This data not only serves to enhance safety by allowing for detailed analysis post-flight but also aids in the coordination of air traffic and ensures compliance with air traffic control regulations.

In the broader context of air traffic control, while radar systems play a crucial role in tracking and monitoring aircraft in real-time, they primarily provide situational awareness to controllers rather than maintaining detailed long-term records. Weather monitoring systems focus on providing meteorological data to ensure safe operations but do not track aircraft movements directly. Control tower lights are used to communicate visually with pilots, particularly during takeoff and landing, but they do not serve any function in record-keeping related to aircraft movements.