Two very high altitude craft bright white color, glowing or reflecting sunlight.While observing two high altitude passenger jets (with contrails) passing overhead. I caught view of two glowing or reflecting craft heading into the East. They were at very high altitude moving very fast and the distance between the two changed as it appeared one of the craft accelerated. The two craft did not appear to be fighter jets and they left no contrails. At first I thought they were seagulls, then I thought...two weather balloons. After a longer look I felt that they were controlled craft. They disappeared behind cloud cover and did not reappear. This is my second sighting in 30+ years of unusual craft and it was exciting to see.