Results from NASA’s Unmanned Aircraft Systems Traffic Management (UTM) project point to the complexity of managing small drone operations at low altitudes.  The space and aeronautics agency completed successive rounds of drone flight demonstrations in two U.S. cities on Aug. 23 using a UTM construct for traffic management. The technical capability level 4 (TCL 4) testing in urban settings represents the final phase of the NASA effort; advancing UTM now shifts to the ...


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