The People's Liberation Army Air Force (PLAAF) has released video of a flight of seven Chengdu J-20 stealth fighters, the largest formation seen so far. Introduced in 2017, the heavyweight twin-engine J-20 is China's most advanced warplane. With its low radar profile airframe, a skin covered in energy-absorbent stealth material, and weapons that can engage targets out of visual range, the J-20 is a rival to the American F-35 Lightning. The PLAAF released footage as part of series to mark 70th an