May 23, 2019
In this Tuesday, May 21, 2019 photo, a drone takes off from the roof of the Cal-Neva casino parking garage in downtown Reno, Nev. as part of a NASA simulation to test emerging technology that someday will be used to manage travel of hundreds of thousands of commercial, unmanned aerial vehicles (UAVs) delivering packages. It marked the first time such tests have been conducted in an urban setting. (AP Photo/Scott Sonner)
RENO — NASA has launched the final stage of a four-year effort to develop a national traffic management system for drones, testing them in cities for the first time beyond the operator’s line of sight as businesses look in the future to unleash the unmanned devices in droves above busy streets and buildings.