formation of lights in two groups

On November 14th.  With my son, I called out to him as I saw 8 orange moving dots in two sets of four.  These were two groups of orange colored lights about 8 to 10,000 feet and maybe 10 miles away.  The two groups were running in unison and were maybe 1500 yards apart – their movement appeared synchronized as the lights moved parallel to the earth’s surface.  I watched them for 20 to 30 seconds and my son saw the tail end of the lights.  The lights all dipped together and then simultaneously disappeared.