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Given the number of new/identified aircraft spotted in the last few months there's a strong possibility this was simply not a U-2.

While that is a possibility, there's nothing to suggest it is stronger than the reported id of the plane, so I'll stick with U-2.

I just watched the U-2 documentary on that site, and I love that among all the super advanced sensors, they are still using a yaw string! :-)

Sometimes the simplest solution is still the best :)