New model regulations to help countries set out globally-aligned civil UAS operations in domestic airspace ICAO Press Release | December 18, 2020 Estimated reading time 2 minutes, 7 seconds. ICAO issued new model regulations this month to help countries establish and refine their national guidelines for domestic Unmanned Aircraft Systems (UAS) operations. The new model UAS guidance has been designed to provide flexibility in terms of both content and risk tolerance levels, helping to ensure consistency for regulators and operators as UAS technologies advance. “Countries can choose to adopt the model regulations in their entirety, or else pick and choose from their provisions to supplement their existing national UAS frameworks,” emphasized ICAO Secretary General Dr. Fang Liu.