Integration of manned and unmanned aircraft systems into U.S. airspace

Drone, remotely piloted vehicle (RPV), remotely piloted aircraft (RPA), remotely operated aircraft (ROA), Unmanned Aerial Vehicles (UAV), or Unmanned Aircraft Systems refer to aircraft without a human pilot on board. UAVs have three main classes based upon the weight - light, medium and heavy. There is a flight altitude restriction of 400 feet for light 10,000 feet for medium and 18,000 feet max for non-military UAV.