Are the BGs being produced new or are they just upgraded B? Are there any known plans to upgrade part of or the whole B fleet to BG?If I'm not mistaken, then these three PLAAF J-11BG fighters have a 70x0x serial number - at least it looks like 70305 & 70400 -, which fits to the 89th Air Brigade at Pulandian, Northern Theater Command.
(Image via @沉默的山羊 from Weibo)
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Edit: just saw deino's post that production ended in 2018 with batch 07