The NAI CK-1 (Chinese: 长空一号; pinyin: chángkōng yī hào; lit. 'long sky-1') is a target drone, and the first drone, developed by the People's Republic of China. It was derived from the Soviet Lavochkin La-17 unmanned aerial vehicle (UAV). Development started with the People's Liberation Army Air Force (PLAAF) in the early-1960s before being taken over by the Nanjing Aviation Institute (NAI) in 1968. It entered service in the late-1970s.