It's not a surprised... I alway long advocate J-20 will enter service soon. The past expected service date of 2017-2018 is unrealistic for J-20. USAF by that time(2018)will already have F-22 block 2. Then PLAAF will again be disadvantage
2013 and 2014 operation for J-20 will be the most likely date. American that time most likely still using the current F-22. It will be a fair or advantage for J-20
Also the J-20 flying at Chengu is most likely just a PR stunt to boast nationalism sentiment and act as a warning to China's enemy..
The real intensive test is hiding from public eye(probably in inner mongolia) with 2-3 J-20 flying around doing all kind of neccessary test to fasten the induction of J-20.
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