My husband and I were seated in Seats 23A and 24A. I was watching the normal city/town lights on the ground almost under the plane when I saw what I can describe as a "flashlight" type of light on the ground. It ranged from a smallish circular light to a wide moving "splash" of light. It appeared and then disappeared. Changing positions and sizes for several minutes. I could not discern any pattern. It was a very random display. My husband saw it. He thought it might be a light from the plane catching a few small clouds below us. The sky was very clear. I could see planets and other planes flying all the time. Could it have been from the plane? I could have thought so if it had been a light that stayed the same, but it moved randomly and varied in size and shape. (Like clouds?) It was a white light. Very strange. We fly only occasionally, so I'm not an expert on moving ground lights viewed from 30,000 feet! But I did think I was viewing something unusual. Maybe what I saw from the plane could be matched up with something viewed from the ground.