Just guessing. But it was really moving and appeared to be quite a few miles away. It looked like the helicopter camera platform was stationary. It was certainly a few multiples of commercial aircraft speed.
There was another photo in the Post this morning of something rising fast and leaving a rising trail from the horizon. The official response was that it was a contrail from a passenger jet leaving JFK. It did look odd, based on what I have seen of contrails, but I suppose it was possible, depending on atmospheric conditions.
Or maybe it’s the space aliens preparing to take Obama back to his planet...