In fact I had a similar idea but wasn't sure ... do you know when we have seen it before?
As I could vaguely remember, there was a conference room of some sort (which is from an institute/department that is underneath/part of the Shenyang AC) with a large wallpaper/poster in the background, which shows largely the same thing as the commemoration plaque you just posted above, but with the planes facing forward while being slightly slanted.
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