A J-20 stealth fighter jet performs aerobatics during the 13th China International Aviation and Aerospace Exhibition, or Airshow China 2021, in Zhuhai, South China's Guangdong province on Sept 29, 2021. Multiple key exhibits of aviation products, including the J-20 stealth fighter jets, Y-20 large transport aircraft and Z-20 helicopters, have been displayed on the ongoing airshow, which will last until October 3, 2021. (eng.chinamil.com.cn/Photo by Yu Hongchun)