Which of the following is true regarding the use of approved aircraft type codes?

The use of approved aircraft type codes is essential in both automated and non-automated environments to ensure safety, efficiency, and standardization in air traffic management. These codes provide crucial information about the aircraft, such as size, performance characteristics, and operational capabilities. This data is vital for air traffic controllers and other aviation personnel when making decisions about spacing, separation, and approach procedures.

In automated environments, aircraft type codes are integrated into systems that enhance situational awareness and enable better management of traffic flows. In non-automated environments, the codes help controllers manually maintain safe and effective communication and coordination with pilots.

Therefore, both environments being required to use approved aircraft type codes underscores the importance of having a consistent and effective method to categorize and manage different types of aircraft in the aviation system, making choice three the correct one.