In air traffic control, what does FMS stand for?

In air traffic control, FMS stands for Flight Management System, which is an essential part of modern aviation. The Flight Management System is an onboard computer system that automates a wide variety of in-flight tasks, including navigation, flight planning, performance optimization, and fuel management. It enables pilots to create and load flight plans, manage the aircraft's autopilot system, and ensure more efficient flight paths, which ultimately enhances safety and operational efficiency.

The other options refer to concepts that are not formally recognized or widely used in aviation terminology. For instance, Flight Mapping System and Flight Monitoring System might suggest functionality related to navigation and tracking but do not accurately describe the integrated system of capabilities that FMS provides. Flight Method System does not represent any actual system used in aviation. Therefore, understanding that FMS is specifically designed to integrate various elements of flight management makes it clear why Flight Management System is the correct answer.