They weren't shapes, per se. They were bright beams of light (15 to 20 ft across) that lit up the ground, played around a bit, then went out. They were all seen between the hours of 3 and 5 AM in TX, AK and I can't remember the third state. There was an account of a policeman chasing one of the lights and video footage taken from a security camera. In all reports there was no sound or obvious source for the lights. This lasted about a week, then stopped. (To the best of my knowledge.)
Now, can you tell me what aircraft is about 45-50 ft long, triangle-shaped and has three bright lights on the bottom that can cruise at 10 mph at an altitude of 40 ft and makes no sound? (seen at Fort Stewart by a neighbor two and a half years ago)