FL250 refers to a flight level of 25,000 feet above sea level, commonly used in aviation. Flight levels are standardized altitudes used by pilots and air traffic controllers to ensure safe vertical separation between aircraft. FL250 is often used for cruising in commercial flights, especially in the mid-range altitude for regional air travel. In the context of aviation, air traffic control plays a crucial role in managing aircraft at FL250. Pilots must maintain communication with ATC to receive instructions and updates about their flight path, ensuring safety and efficiency in the skies.