What does the term "Yo-Yo" refer to in air traffic control?

The term "Yo-Yo" in air traffic control refers to a situation where an aircraft departs with one event and then returns with the previous event. This terminology reflects the pattern of movement akin to a yo-yo, where the aircraft ascends and then descends again, often due to the adjustments needed in response to air traffic conditions, weather, or other operational requirements. This maneuver indicates a back-and-forth pattern of movement, requiring coordination with air traffic control to manage the flight’s trajectory effectively. Understanding this term helps controllers maintain an organized flow of air traffic, especially in busy airspace where multiple aircraft are navigating similar routes.