National Academies: “TRB’s Airport Cooperative Research Program (ACRP) Legal Research Digest 32: Evolving Law on Airport Implications by Unmanned Aerial Systems provides guidance to enhance understanding of the basic legal and operational issues presented by civil unmanned aerial systems (UAS), and evaluates best practices for managing these issues. The digest covers background on UAS uses, applications, regulations, and definitions, leading to operations within the National Airspace System (NAS), the issues of federalism as it relates to local and state laws, tort law implications, operations at airports, and best practices for airport operators. Appendix B—Guidance and Policy Documents and Appendix I—Summary of Interviews and Poll Results are available online.”