I was a passenger in a car heading West on Cottonwood LN, when I noticed Four bright objects in a straight horizontal line. This occurred approximately 1930 hours. These lights were in a vicinity where there are no tall structures and way too high. These objects were far right of Casa Grande Mountain which have red tower lights. I knew at this point these objects did not belong there. After a few minutes the lights disappeared. Two lights reappeared in a westward direction hovering, what looked like over the electrical power plant, but further back. The two lights were higher than the red lights on top of the power plant. Also, I was able to see a jet airliner going in a northeastern direction with its navigation lights on many thousands of feet above the hovering lights. A few minutes later both lights disappeared in place. I figured that the objects were UFOs because I saw no navigation lights, heard no sound (maybe because of the distance)and where I saw them.