Photo taken on July 29, 2013 shows an aviation enthusiast operates a fixed wing aircraft during the 2013 AOPA (Aircraft Owners and Pilots Association of China, AOPA-China) Aviation Festival in Hexigten Banner, north China's Inner Mongolia Autonomous Region. Players brought 11 private flying machines to the festival, which is also called sky Nadaam, meaning a big party for flying fans. The three-day festival closed on Monday. (Xinhua/Meng Xuewu)

Photo taken on July 29, 2013 shows an aviation enthusiast operates a fixed wing aircraft during the 2013 AOPA (Aircraft Owners and Pilots Association of China, AOPA-China) Aviation Festival in Hexigten Banner, north China's Inner Mongolia Autonomous Region. Players brought 11 private flying machines to the festival, which is also called sky Nadaam, meaning a big party for flying fans. The three-day festival closed on Monday. (Xinhua/Meng Xuewu)

Photo taken on July 29, 2013 shows an aviation enthusiast operates a fixed wing aircraft during the 2013 AOPA (Aircraft Owners and Pilots Association of China, AOPA-China) Aviation Festival in Hexigten Banner, north China's Inner Mongolia Autonomous Region. Players brought 11 private flying machines to the festival, which is also called sky Nadaam, meaning a big party for flying fans. The three-day festival closed on Monday. (Xinhua/Meng Xuewu)

Photo taken on July 29, 2013 shows an aviation enthusiast operates his aircraft during the 2013 AOPA (Aircraft Owners and Pilots Association of China, AOPA-China) Aviation Festival in Hexigten Banner, north China's Inner Mongolia Autonomous Region. Players brought 11 private flying machines to the festival, which is also called sky Nadaam, meaning a big party for flying fans. The three-day festival closed on Monday. (Xinhua/Meng Xuewu)

Photo taken on July 29, 2013 shows an aviation enthusiast operates a fixed wing aircraft during the 2013 AOPA (Aircraft Owners and Pilots Association of China, AOPA-China) Aviation Festival in Hexigten Banner, north China's Inner Mongolia Autonomous Region. Players brought 11 private flying machines to the festival, which is also called sky Nadaam, meaning a big party for flying fans. The three-day festival closed on Monday. (Xinhua/Meng Xuewu)

Photo taken on July 29, 2013 shows an aviation enthusiast operates a small rotorcraft during the 2013 AOPA (Aircraft Owners and Pilots Association of China, AOPA-China) Aviation Festival in Hexigten Banner, north China's Inner Mongolia Autonomous Region. Players brought 11 private flying machines to the festival, which is also called sky Nadaam, meaning a big party for flying fans. The three-day festival closed on Monday. (Xinhua/Meng Xuewu)