How quickly must GWO TWR advise ZAE of an unplanned missed approach?

The correct answer emphasizes the critical nature of communication in air traffic control, particularly regarding unplanned missed approaches. When a missed approach occurs unexpectedly, prompt notification to ZAE— the relevant controlling agency— is essential for maintaining safety and situational awareness. Immediate reporting allows ZAE to update the flight's status, manage traffic, and respond effectively to any potential repercussions stemming from the event.

The emphasis on an immediate notification ensures that all parties involved in air traffic management are informed in real time, which is crucial for coordinating safe operations and preventing conflicts with other flights. This requirement aligns with standard protocols that prioritize timely communication during critical situations in air traffic control.

In contrast, options suggesting a delay, such as within a minute or five minutes, do not provide sufficient immediacy required in such scenarios, potentially compromising safety and operational integrity. Similarly, the choice indicating communication after the aircraft has landed fails to address the urgency needed during the missed approach, making it unfit for a timely operational response.