What term describes a procedure that is recommended in air traffic control?

The term "should" in the context of air traffic control indicates a procedure that is recommended but not mandatory. It suggests that following this procedure is expected to lead to better safety and efficiency in operations, aligning with best practices established in the industry. This differs from "must," which denotes a requirement that must be followed. "May" implies that a procedure is optional, and "could" suggests a possibility without any obligation to act.

Using "should" conveys that while there is a strong reason to adopt the recommended procedure, there may be circumstances where deviations could be justified. This terminology plays a significant role in enabling air traffic controllers to exercise good judgment and adapt to unique situations while maintaining safety standards. Therefore, understanding the implications of these terms can significantly affect the decision-making process in air traffic control scenarios.