What does the code on military training routes indicate?

The code on military training routes is designed to indicate the altitude at which the military aircraft will be operating, specifically whether they will be flying above or below 1,500 feet above ground level (AGL). These routes, marked on aeronautical charts, are intended for military training flights that often involve low-level flying techniques.

The distinction between flights above and below this altitude is crucial for other aircraft, as it helps to ensure situational awareness and maintain safe separation in the airspace. Pilots can use this information to anticipate encountering military operations in certain altitudinal environments while they plan their own flights.

Understanding these routes is essential for all pilots to navigate safely around areas where military training is taking place, thereby enhancing safety and efficiency in shared airspace.