This video, taken last April, remains unexplained. It’s a good example of a probable unknown. It’s moving too fast to be a blimp, it’s not close to the camera, and it shows not the slightest evidence of wings or a tail. Probable unknown.
http://www.youtube.com/watch?v=UlSZMnVIpkIStory Source:
http://www.openminds.tv/ufo-video-over-dusseldorf-airport-in-germany-1148/