Light moving in random motions at approximately 30,000' - 50,000' for more than 2 hours.While looking up at the dusky night sky, I noticed a light that was moving very slowly from east to west that was going much slower than a satellite or airplane. I watched it for about one minute before it started moving erratically at a slow, often jerking motion. It was moving like a fish or a snake at times, and at others it was hardly moving. It could make abrupt 180 degree turns and other maneuvers not possible with today’s modern aircraft. With some binoculars, it looked like a single bluish white light with the intensity of a bright star. Broken high altitude clouds were moving thru the area and its light would be obstructed as it flew thru or above the clouds. It appeared to be at or just above the clouds as its light would dimly reflect off the clouds. I first saw the light around 9:20 p.m. Alaska Standard Time. There were 3 other witnesses when I first saw the light. I was near Mile 109 of the Seward Highway when I first watched the light move around the sky for about 20 minutes. I drove home and arrived around 9:50 p.m. At this time I had 4 other witnesses see the light moving around in the sky as the night grew darker. The light hung out in roughly the same part of the sky near the Constellations Cygnus and Lyra. A witness and I laid down in our front yard and watched the light move around for another 50 minutes before we went inside to write this report. By this time the sky was mostly clear and dark and stars were visible. 20 minutes later, the light was still visible continuing the same motions as before. A second light was seen shortly after I arrived home but we did not maintain visual of that object for more than a minute while we focused mainly on the original light.