Air Force On Dec. 23, new video showing J-20 carrying 4 auxiliary fuel tanks during training admin — December 25, 2016 add comment On Dec 23, 2016, a video footage indicated that China’s stealth fighter J-20 was training with 4 auxiliary fuel tanks. http://www.chinadefenseobservation.com/wp-content/uploads/2016/12/j-20-4.mp4