U.S. regulators have chosen six universities and other public entities to develop test sites for domestic drones. The approved test sites are located in at least 10 states ranging from New York and Massachusetts to Hawaii, Alaska, Nevada and Texas. The Federal Aviation Administration says the sites will “conduct critical research” on the requirements needed to “safely integrate [drones] into the national airspace over the next several years.” Hundreds of entities, including law enforcement agencies, are already permitted to fly drones. The latest testing is part of a push to use drones for commercial purposes.