The latest video, published by the  People's Liberation Army Air Force (PLAF) on Tuesday and aired on national television, showed seven J-20s participating in a training maneuver.

This was the second-largest J-20 flight disclosed on video by the PLA, the first was on PLA day on August 01, when five jets were shown.

The four-minute video, the latest video to commemorate the 70th anniversary of the People's Republic and its air force. Another flight could be scheduled on October 10.

"This video is to say that a number of mass-produced J-20s have entered service and are ready to do battle," said Song Zhongping, a military commentator based in Hong Kong.

The Post believes the Chengdu Aircraft Industry Group has ramped production of the stealth fighter to at least 20 per year. Engine delays have limited J-20 production over the last several years.