J-20 2015 First Flight
The 6th J-20 stealth fighter takes off on December 19, 2014 in Chengdu, China. The rapid production of J-20 prototypes (4 so far) this year suggests that the fighter is well on its way into production.
6th J-20 Stealth Fighter Rolls Out, More to Soon Follow
China On Track to Operate Asia's First Stealth Fighters
J-20 Radar Testbed
This fan made comparison shows the Tu-204 "769" airliner modified for use as the J-20's radar testbed, along with its American Boeing 757 counterpart which tested the F-22A's radar. The grey panels beneath 769's cockpit could be smaller side and rear mounted radars for the J-20, to provide 360 degree coverage. Like the F-22, the J-20 will have an AESA radar capable not only of detecting enemy radars and guiding missiles, but also it can jam enemy electronics, communications, as well as conduct intelligence gathering and processing.
"2015" sits on a runway in Chengdu, China. The fighter is expected to leave for further testing at the CFTE base in Xian, China, nearly a thousand miles away. The main difference between "2015" and the earlier "2011" and "2012" seem to so far be the modified tail boom stingers, which likely house rear facing radar.
2015 made its first flight on December 19, 2014. At this point in the J-20's development, the design is essentially fixed, though the AL-31 engines are likely to be swapped for more powerful WS-15 turbofans by 2019.
"2013" first flew on November 29, 2014, just three weeks before "2015". The ability of Chengdu Aviation Corporation to field so many J-20s in such a short timespan is indication of growing capability to rapidly produced a finalized design of the J-20 fighter.
F-35 highlights for 2014