FILE - In this March 12, 2014 file photo, a drone flies over the scene of an explosion that leveled two apartment buildings in the East Harlem neighborhood of New York. A government watchdog says commercial drone flights are taking off in other countries while the U.S. lags behind in developing safety regulations to would permit unmanned aircraft operations by a wide array of industries. The Government Accountability Office (GAO_ also estimated Wednesday in prepared congressional testimony that it will be nearly years or longer before the Federal Aviation Administration issues final rules to permit commercial use of small drones. (AP Photo/Mark Lennihan, File)