FL150 refers to a flight level of 15,000 feet above sea level, commonly used in aviation. It is a standard altitude for aircraft during cruising, allowing for safe separation from terrain and other air traffic. Pilots and air traffic controllers use flight levels to communicate altitude in a standardized way, ensuring clarity and safety in the skies. In the context of aviation, FL150 is part of a broader system of flight levels that helps manage airspace. This system is crucial for maintaining safe distances between aircraft, especially in busy air corridors. Understanding flight levels like FL150 is essential for pilots and air traffic controllers alike.