Which system controls the automated flight route within the aircraft?

The Flight Management System (FMS) is responsible for controlling the automated flight route within the aircraft. It integrates various navigation inputs and manages the aircraft's flight plan, guiding it along the desired route based on pre-programmed waypoints, airways, and other parameters. The FMS works in conjunction with the autopilot to execute the flight plan autonomously, allowing pilots to focus on monitoring the systems and communicating with air traffic control rather than manually flying the aircraft.

While the autopilot system assists in maintaining the aircraft's flight path by automatically controlling the aircraft's attitude and navigation parameters, it relies on the flight management system to determine the route and make adjustments based on flight data. The flight control system encompasses the physical controls that allow for maneuvering the aircraft but does not handle navigation directly. Lastly, the navigational flight system is not a standard term used in aviation and does not specifically refer to a system that manages the flight route in modern aircraft.