What is the key feature distinguishing Controlled Firing Areas (CFAs) from other airspace?

The key feature that distinguishes Controlled Firing Areas (CFAs) from other types of airspace is that they require immediate suspension of activities for approaching aircraft. CFAs are specific areas where activities such as military training and other forms of ordnance firing can take place, but these activities are only conducted when the airspace is clear of other aircraft. When an aircraft is detected approaching a CFA, the activities conducted within that area must be halted to ensure the safety of all air traffic. This operational protocol emphasizes the priority of maintaining a safe flying environment even amidst active training exercises.

In contrast, other characteristics associated with CFAs, such as radar tracking systems or restricted altitude limits, do not uniquely define them. While CFAs feature some level of oversight, they do not always require extensive radar coverage or impose specific altitude restrictions. Additionally, CFAs are not charted for pilot awareness like other restricted areas; rather, they exist primarily for operational safety without having to be marked on aeronautical charts specifically. The focus on immediate activity suspension for the safety of incoming aircraft remains the fundamental aspect that sets CFAs apart.