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if your only proof is someone story it's probably not true

They also got a thermal image of it and pilots in other jets at the scene corroborate his story.

you have any reason to think it's a real image another reason than it look real ?

Honestly, I could care less about the image. Other pilots corroborate his story. That's good enough for me. Whether you believe it or not is irrelevant to me. It is what it is.