Dating professional fighter
By the late 1990s there was general agreement in the open literature that China was working on some type of stealthy fighter attack aircraft, and that this program has been underway since the mid-1990s.
For a long time, there was very little agreement beyond these basic points.
Combining a foreplane, a tailplane and thrust vectoring would enhance manoeuvrability.
Engines were expected to be a version of the Wopen WP15 in the 26,000lb-thrust (115k N) class.
By 2001 the US Office of Naval Intelligence (ONI) had revised its assessment of the Chinese advanced fighter.This new estimate revised the in-service date to 2010.