Which airspace indicates that flight is completely prohibited?

Prohibited areas are specific sections of airspace designated by the Federal Aviation Administration (FAA) where flight is entirely prohibited. These areas are established for security or national defense purposes and are often located over sensitive military installations, nuclear power plants, or other critical infrastructure.

When an airspace is classified as prohibited, it means that no aircraft, unless expressly authorized by the controlling agency, may enter that space under any circumstances. This total restriction highlights the importance of these areas in maintaining safety and security. It is crucial for pilots to be aware of these prohibitions during flight planning to avoid inadvertent violations, which could result in severe consequences.

On the other hand, restricted areas, while they also impose certain limitations on flight, might allow for specific activities with prior permission. Alert areas indicate where high volumes of pilot training, aerobatics, or other activities may occur, serving as a warning rather than a prohibition. Warning areas are similar to restricted areas but are located over international waters and also do not prohibit entry, although caution is advised. Thus, understanding these distinctions is key for safe navigation in controlled airspace.