What type of data must controllers prioritize?

Controllers must prioritize critical operational data because this type of data is essential for immediate and effective decision-making in the air traffic management system. Critical operational data includes real-time information about aircraft positions, altitude, speed, and planned routes, which are fundamental components for ensuring safe and efficient operations. This data allows controllers to manage air traffic dynamically and respond to changes or emergencies as they arise.

In contrast, while historical flight data and routine maintenance data are important for planning and analysis, they do not have the same immediacy and relevance in the day-to-day operations of air traffic control. Emergency response data, while crucial during crises, is only needed when a specific emergency occurs rather than for everyday operational management. Thus, the prioritization of critical operational data ensures that controllers can maintain safety and efficiency in real-time air traffic control scenarios.