Number of aircraft 2018 Type of Aircraft Registration HS-Commercial Aircraft HS-Private Aircraft U-Ultralight Private Aircraft Total HS-Commercial Aircraft Schedule Airline MTOW(1) > 5,700 kg. Schedule Airline MTOW(1) < 5,700 kg. Non-Schedule Airline MTOW(1) > 5,700 kg. Non-Schedule Airline MTOW(1) < 5,700 kg. NCA(2)-Helicopters NCA(2)-Balloons NCA(2)-Test flights NCA(2)-Training flights NCA(2)-Aerial work Total Remark : (1) MTOW : Maximum takeoff weight (2) NCA : Non-Schedule Commercial Air Transport Aircraft Registration as of 18 April 2019 Source : The Civil Aviation Authority of Thailand