Assuming I'm looking at the right thing, it looks like a small GA aircraft to me, but then compared to the size of the trees and tennis courts, it'd be an airliner. On that basis I'd say, it's an illusion.
My immediate impression was a float plane but given the scale I think that it is safe to say it is an illusion. We had the same problem looking for 200 yard moving target ranges; your brain wants a familiar shape to be real!
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