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View Video Presentation: https://doi.org/10.2514/6.2021-2365.vid A conceptual system for forecasting the risks involved in various operations in the National Airspace System is discussed. The approach employs a recently-developed simulation of the air traffic operating in the National Airspace System under Title 14 CFR-Part 121 regulations as its prediction engine. Trajectory predictions are based on aircraft surveillance data obtained from ADS-B and ASDE-X, flight plans, any expected aircraft performance variations and adverse environmental factors. For each aircraft in the airspace region of interest, trajectory predictions are carried out over a chosen time-horizon, within a specified region of regard relative to aircraft, to detect any developing adverse situations. These adverse situations are sorted according to the Aviation Occurrence Categories identified by the Common Taxonomy Team and the Commercial Aviation Safety Team of the International Civil Aviation Organization. Comparisons between the control authority required to avoid impending adverse events and the available control authority are then used to define risk measures. Risk measures in conjunction with historical accident/incident data from the National Transportation safety Board reports are then used to assess the risks to the passengers, cargo, ground personnel and equipment. The proposed methodology is illustrated for a few Aviation Occurrence Categories using a traffic simulation of the National Airspace System.