What differentiates Controlled Firing Areas (CFAs) from other special use airspace?

Controlled Firing Areas (CFAs) are specifically designed to ensure the safety of aviation operations during activities that may be hazardous, such as live fire exercises or missile tests. What sets CFAs apart from other special use airspace is that the activities occurring within them must be suspended for any approaching aircraft. This suspension is an important safety measure, as it allows for the safe passage of aircraft through or near the area where potentially hazardous activities are taking place.

Unlike other special use airspace types, where the presence of restrictions is often permanent or ongoing, CFAs are unique in that they are activated only when necessary, and there is a requirement to cease operations if an aircraft enters the area. This consideration for maintaining safety for all air traffic demonstrates why this option is the correct answer. Activities may be permitted at any time in CFAs, but the active management of safety surrounding the airspace sets it apart.

In contrast, other options involve either the nature of how activities are managed (requiring local authority approval or being restricted to daylight monitoring), which is irrelevant to the specific operations of CFAs.