Damn... Decided to take a break from Weibo scavenging and they immediately decided to post something new lol. Allegedly J-35 prototype 350003 taking off from 2 years ago.
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Interestingly, the image source said this particular prototype should have a new designation of '3503' by now, and prototype '3505' (the one seen recently without the pitot tube) isn't even the newest.
Source:
And another one from the same series ...