What is essential before issuing an Aircraft Conflict alert?

The essential requirement before issuing an Aircraft Conflict alert is awareness of other aircraft's altitude and position. This knowledge is critical because it enables air traffic controllers to accurately assess the situation and determine whether there is indeed a potential conflict between aircraft. By understanding both the altitude and position of the aircraft involved, controllers can make informed decisions about how to manage the airspace and maintain safety. It allows for a proactive approach to conflict resolution, ensuring that any necessary instructions can be communicated to the pilots in time to prevent a possible airspace violation or collision.

Confirmation from the airline, understanding the flight plan, or knowing the approximate flight duration may provide helpful context, but they do not directly contribute to the immediate assessment of conflict resolution. The primary concern in air traffic control is always the real-time positioning and altitude of aircraft, which is crucial for maintaining safety in the skies.