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To cope with increasing demand on the air traffic management system, this paper proposes a novel user interface which supports air traffic controllers in conflict detection and resolution. The concept is based on previous work on 3D solution space displays for air traffic control, but then aimed at improving the interaction by better integrating speed, heading, and altitude constraints on the Plan View Display. A preliminary, subjective human-in-the-loop evaluation study was performed using five participants with various experience levels in real-life air traffic control. Results from the evaluation indicate that both successful use of the interface as well as the perceived support from the user interface depend on the participant’s experience in air traffic control. The most experienced controller relied much less on the interface and found it the least useful. Future work is recommended for improving the user interface to better suit a controller’s tasks.