Patent ID: 8255147

Claim:
An air traffic control system, for use by a controller controlling a plurality of aircraft, comprising: a processor, an input device, a display device, trajectory prediction means for calculating a predicted altitude trajectory for each of said plurality of aircraft, for inputting aircraft detected position data, and for recalculating said predicted altitude trajectory for each of said plurality of aircraft based on said position data, means for inputting and storing instruction data corresponding to level clearance instructions issued by said controller to one or more of said plurality of other aircraft, and means for causing a display on said display, said display comprising a graph indicating the predicted altitude trajectory for a selected aircraft of the plurality of aircraft, and indicating symbols, one for each of a plurality of other aircraft of the plurality of aircraft, said indicating symbols for each of the plurality of other aircraft indicating both the current level and the one or more levels for which said level clearance instructions have been input.