The Airport Surface Surveillance System (ASSC) is a runway safety tool that shows aircraft and land vehicles on the surface of the airport as well as aircraft on approach and exit roads a few kilometers from the airport. The tool allows air traffic controllers and flight crews in cabinets equipped with Automatic Dependent Diffusion-Diffusion (ADS-B) to detect possible runway conflicts by providing detailed coverage of movement on runways and taxiways. By collecting and merging data from a variety of sources, ASSC is able to track vehicles and aircraft on airport surfaces and obtain identification information from the aircraft's ADS-B transponders.
ASSC offers similar ASDE-X capabilities and screens, as both systems provide real-time tracking information of ground movements using the same instrument cluster. San Francisco International Airport was the first national airport to implement ASSC in October 2016, however months later it was about to suffer the biggest accident in history by an airplane that was to land on the taxiway where there were four aircraft in the AirCanada Flight 759 incident. List of airports
Nine sites have installed or plan to install ASSC to 2017, under a five-year contract awarded to Saab Sensis Corporation in early 2012
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