My wife and I were floating on rafts in our pool cloud watching when I noticed what at first I thought were buzzards cruising across the sky. Immediately I realized they were a perfect oval shape and very high. I would say somewhat higher than a commercial aircraft and the mass may be similar in size to an average airliner. Their speed was much faster than commercial aircraft and I only saw two as I pointed them out to my wife. They moved a crossed the sky at an even pace. Toward the end of their track west my wife says she saw a third. They continued west out of site. It only took them about 20 seconds. I have seen satellites, it was a somewhat cloudy day with a very high cloud cover. Therefore the craft was easier to see against the grey background. My gut feeling was it may be military. But definitely the shape was a perfect oval with no nose or tail. Therefore cruse across the sky and it wasn't quite that fast, but fast none the less. very strange.