The unmanned aircraft systems (UAS) industry is on the cutting edge of aviation innovation. Airports, including tenants and contractors, are discovering the benefits of UAS to their operations and bottom line. Yet, with the diversity of UAS applications at airports, there has been a lack of relevant industry data on this topic to inform the airport industry on current practices. The TRB Airport Cooperative Research Program's ACRP Synthesis 104: Current Landscape of Unmanned Aircraft Systems at Airports seeks to understand the degree of UAS use, including specific applications, by three groups: airports, airport contractors, and airport tenants. Using responses from 130 airports, one of the report's findings is that approximately 9% of participating airports are actively using UAS for airport purposes.