J-20 5th Generation Fighter VII
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by78
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It doesn't look like the lighting is the cause. They look like real wrinkles to me.
Is it normal? Doesn't look normal to me, but I am no aeronautical engineer.
by78
General
Probably nothing to worry about. The wrinkles are on the removable panels, which are thin pieces of metal or composites that are not load-bearing or structurally critical. The wrinkles were likely formed from normal structural stresses (torsion, bending, etc.) being transferred to the thin panels, crinkling them up like paper, in a manner of speaking.
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Found a video on bilibili:
J-20 flyby, I'm assuming these were the escorts:
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