When might an air traffic controller issue an "expedite" command?

An "expedite" command is commonly issued by air traffic controllers in situations of potential traffic congestion. This directive is intended to prompt a pilot to take immediate action, such as climbing or descending quickly, or adjusting their flight path, to alleviate any imminent traffic conflicts. The use of such a command helps maintain safety and efficiency in airspace management by preventing potential collisions or delays that could arise from overlapping flight paths.

In contrast, a routine flight check typically does not necessitate immediate action, and a pilot's request for a flight altitude change is usually processed according to standard procedures without an urgency command. Likewise, while landing is a critical phase of flight, an "expedite" command might not be given unless there is specific traffic congestion or other safety concerns that warrant immediate action. Therefore, the context of traffic management is key to understanding when an "expedite" command is appropriate.