Hmm just saw a clip of apparent UFO sighting that I found on ebaums. Not sure if it's real or not just kinda weird. It seems to me like this would be really hard to hoax from a helicopter looking out towards the NYC skyline. The ufo is hiding at first in back of one of the twin towers. This is in 2000.
http://www.ebaumsworld.com/ufosighting.html