Interesting, in one of the very first frames where it enters into view it looks like it has the shape of a helicopter. However the problem I have with that is that you would think it would be more clearly defined and the propellers weren't visible. Definitely something though.

It seems to be an Unidentified Flying Object.
This object could be a helicopter, a bird, some kind
of drone for NASA or an inter-stellar visitor.

I'm leaning towards a bird.

Where was this landing?! (what city?)

Like SupakOma said in the first video,"it passes behind the shuttle, would have to be a super huge bird....

My thoughts were an aircraft of some kind!

I have looked at it in Camtasia studio and it seems to alter it's shape as it passes the shuttle.I would put some shots up but I can't figure out how to.

Funny thing is no one commented on it in the Response section, on the NASA
video.

I can saftley say we can rule out birds and camara faults.

Lewtra

Hey Lewtra, cool vid,

From what I saw in the video, it's just to inconclusive to make me think that it was anything else than a bird in the foreground. It is, in my humble opinion, organic and super blurry because of the extreme zoom used to capture the shot.

As for the plane theroy, I do think that NASA does employ chase planes to escort the shuttle when it comes down. I'm not saying this is factual as I just remember reading it somewhere.

SeeYa!!!