It's hard to say whether or not it's real. It LOOKS pretty good. I'm a little taken by that trail on the end of it though. That's different than any other I've seen.
Honestly though, upon first look, especially before it went frame by frame and then the zoom in, it looked like a bug right outside the plane. But then especially when he zoomed in, it looks like a saucer shaped something.
But, these days, god only knows what authentic and what's not.