I've given the name Whatzit to any sort of Black Ops technology that could be used to simulate an "alien invasion" or the arrival of "friendly aliens", as soon as they decide to step up to the Utiimate Boogieman.
This secret technology was used on 911, not passenger planes or swapped planes, but technology based on math kept secret.
The strange movement here is certainly neither bird or helicopter.
Since it was caught in four videos from three cameras, it can't be an artifact.
There is also a set of stills that caught this object, including one frame with a helicopter close by
http://thewebfairy.com.911/newwhatzits/merkeba