And this from yesterday's Washington Post:
Near-collisions between drones, airliners surge, new FAA reports show - The Washington Post
Since June 1, commercial airlines, private pilots and air-traffic controllers have alerted the FAA to 25 episodes in which small drones came within a few seconds or a few feet of crashing into much larger aircraft, the records show. Many of the close calls occurred during takeoffs and landings at the nation’s busiest airports, presenting a new threat to aviation safety after decades of steady improvement in air travel.
As many/most of these drones contain GPS capabilities, couldn't manufacturers limit altitude automatically? Some of these incidents occurred at several thousand feet.