New air traffic management (ATM) constructs are taking shape around drones, commercial spacecraft and urban air mobility (UAM) vehicles, known collectively, at least for now, as “nontraditional” entrants into the airspace.  The NASA-led Unmanned Aircraft System (UAS) Traffic Management (UTM) project to develop a low-altitude traffic management system for drones started its final phase of testing in May. Technology Capability Level 4 (TCL4) testing in Reno, Nevada, and ...


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