How are alert areas depicted on aeronautical charts?

Alert areas are specifically depicted on aeronautical charts using a representation that includes an "A" followed by a number. This signifies that the area is designated for activities that might be hazardous to non-participating aircraft, such as military exercises or other high-traffic operations. The purpose of alert areas is to increase situational awareness for pilots flying in or near these regions.

Using an "A" followed by a number allows for a standardized approach to identifying these areas across various charts, ensuring that pilots can easily recognize and understand where heightened caution may be necessary. This format helps maintain safety in the National Airspace System by alerting pilots to potential risks associated with operations within those zones.