What is the area on an aeronautical sectional chart that is charted with a P followed by a number?

The area on an aeronautical sectional chart that is marked with a "P" followed by a number designates Prohibited Airspace. This type of airspace is established to prohibit all aircraft flight operations due to security or national welfare concerns. Prohibited areas are clearly defined on sectional charts, and their designation indicates that no pilot is permitted to enter without specific authorization.

Understanding the classification of airspace is crucial for maintaining safety and compliance with aviation regulations. Prohibited areas are often located over sensitive sites, such as military installations or other critical government facilities, where unauthorized aircraft operations could pose a significant risk.

In contrast, restricted airspace, which is designated by a "R," allows for some operations but can impose limitations concerning altitude and activities. Warning areas, typically marked as "W," are located over the ocean and indicate potential hazards to flight but do not prohibit entry. Military operations areas (MOAs) may encompass airspace where military training activities occur, but they do not restrict civilian flight, although pilots are encouraged to exercise caution.

Therefore, recognizing the "P" designation on a sectional chart is essential for pilots to understand where they are prohibited from flying, contributing to the overall safety of aviation operations near these sensitive areas.