The pilot filmed UFO, which is not visible on radar

UFO Photos
Photo radar aircraft
Brazilian pilots of a commercial airliner taking off from Rio de Janeiro, filmed on a mobile phone a UFO, accompanying the aircraft.
A pilot who posted a video on his Facebook page says that long doubted whether the video spread.
UFO chasing the plane about 25 minutes.
The pilot shot not only a UFO, but also on-board radar screen, which is not seen any aircraft or any other objects in a radius of hundreds of kilometers away from the aircraft.