A Brief History of the Creation of Chengdu J-20.
View attachment 85597
Additionally, for those who are interested, here is a link to the file in full size -
Great ... and I hope you don't mind a suggestion for an addition: No. 2022 is missing which was most likely flown first in January 2018 ...
... and then the service entry dates - or in case we don't know for sure - the date whenever we saw a new unit for the first time:
J-20 (AL-31FN or FM)
1. 176th Air Brigade PLAAF Dingxin Flight Test & Training Base on 12 December 2016 (S/N 78x7x)
2. 172nd Air Brigade PLAAF Cangzhou Flight Test & Training Base in February 2018 (S/N 78x3x)
3. 9th Air Brigade at Wuhu Airbase on 13 January 2019 (S/N 62x0x) - ETC
J-20A (WS-10C)
4. 172nd Air Brigade PLAAF Cangzhou Flight Test & Training Base in January 2021 (S/N 78x3x)
5. 1st Air Brigade at Anshan Airbase in April 2021 (if not earlier?) (S/N 61x2x) - NTC
6. 5th Air Brigade at Guilin Airbase in January 2022 (S/N 61x6x) - STC
7. 56th Air Brigade at Zhengzhou Airbase (S/N 66x7x) - CTC
8. a yet unconfirmed AB within the WTC
And finally the J-20 engine testbed - eventually 2021 or 2013 - is undergoing test at CFTE since late 2021.