UFO Sighting in Longford, on February 6th 2016 – black strange shape object fling above heathrow airport flight path

The object,which didnt seen to have any solid shape seemed to fly towards an airliner as it was landing about a mile or two from heathrow airport..it then seemed to change direction and fly away from the airport direction.There was no noise an it didnt seen to be going too fast..I thought it was strange that it was flying very close to the heathrow inbound flight path.