Shape with two points of light at each end at low altitude

While looking west at approximately 8:00 pm I noticed a light coming fast from the south to the north several miles away and fairly low. As it crossed my position in front of me I could make out a shape with two points of light at each end. It continued north and then made a turn to the east and appeared to circle to the south as I lost sight of it. The shape was moving faster relative to the planes in the sky as I am situated on a flight path to midway airport and o’hare. I have seen military jets up close and didn’t hear the tell tale afterburners.