This MITRE developed, Converging Runway Display Tool (CRDA), is an automation aid for air traffic controllers that allows users to precisely establish and maintain a stagger distance between two aircraft approaching on different runways. The basic function of CRDA is to project position information of an aircraft approaching one runway onto the final approach course of the other runway of the pair (known as "ghost" targets). The capability of CRDA to enable the controller to make better judgments about spatial relationships between aircraft that are approaching converging or intersecting runways has been adequately proved in operational use.