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Free Flight will change today's air-traffic-control system by giving pilots increased flexibility to choose and modify their routes in real time, reducing costs and increasing system capacity. This increased flexibility comes at the price of increased complexity. If Free Flight is to become a reality, future air traffic controllers, pilots, and airline operation managers will require new conflict detection, resolution, and visualization decision support tools. This article describes a testbed system for building and evaluating such tools, including the visualization modes, lessons learned, and feedback received from expert users.

H. Neely, R. Azuma, R. Geiss and M. Daily, "Visualization Tools for Free Flight Air-Traffic Management," in IEEE Computer Graphics and Applications, vol. 20, no. , pp. 32-36, 2000.
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