The following exert is an eye witness statement. Please read into it what you will. This has been reported to mufon who I am sure are investigating:
I was on a flight to heathrow airport in england and i saw a shiner disk shaped object outside the plane window. many other people saw it through different windows , so it couldnâ€™t have been a crack or light reflecting off of the window. it them moved up and down/ side to side so i could tell that it wasnâ€™t an aircraft.
zoom into the original photo and you can see it. i also edited the other two photos to be clearer in showing the shape of the ufo.