Above object on airplane flying over alps when I seen a black craft flying low to the tops of the mountains with grey smoke of it

1 object which was of black colour and teardrop shape flying low and very fast over the top of the alps. I was above it in a plane which departed from Dublin at about 13:45 going to Rome on the plane company Ryan air. The craft appeared to be small about the size of a fighter jet completely travelling very fast as it covered a huge distance in 10-20 seconds. The object had a beam grey smoked coming from the bottom of it into the ground below. This was not making a mark on the mountains though.