It was a greyish black saucer hovering over Tenerife south airport that moved at supersonic speedIt was saucer like with three pads on the bottom. It had three front windows in a long rectangle and a big black bump on the back. It hovered over the control tower then slowly went behind the transmitting pole hovered just by the side then shot of at an incredible speed. I was the only witness as I was awestruck and only reacted quick enough to take a blurry picture on my phone. There was only one and it was a greyish black.