Which type of signal is commonly used by Pathfinders to alert aircraft?

Visual aids are commonly used by Pathfinders to alert aircraft because they provide a clear and immediate means of communication that can be seen from a distance. These signals include items such as flares, panels, smoke, and other forms of light or reflective devices that are designed to be easily distinguished from the environment. The primary advantage of visual aids is their ability to convey information quickly and effectively, particularly in situations where radio communications may be compromised or when aircraft are operating at altitude and need to see the signal from afar.

Additionally, visual signals can be standardized for quick recognition by pilots, which enhances safety and efficiency during operations. In the context of Pathfinder operations, where precision and clarity are crucial for successful landings and pick-ups, visual aids play a vital role in ensuring that aircraft are effectively directed to the desired landing zones.