MUFON 112847

White object followed plane keeping the exact same pace, distance from the plane and exact same direction for as long as I could see it. Looked up to see a plane with vapour trail and under it a white object hover directly underneath it. It was going at exactly the same speed as the plane, maintained the same distance apart from the plane and the same direction for as long as I could see it. There was no noise but the plane was very high