rapid zig-zag movementsabd departed in a flash

I graduated from the Naval Academy in 1966 and was a Naval Aviator from 1966 to 1972.  I flew Super Constellations out of Rota, Spain, from 1968 to 1971.  We frequently flew back to the United States and were going to refuel in Argentia, Newfoundland.  It was dark and we were watching for satellites which at night would look like slow moving stars.  Once we saw what looked like a satellite but was going faster; from east to west.  We were going northwest.  All of a sudden, the object stopped and started going in rapid zig-zag movements, then, it abruptly stopped and, in a flash, disappeared to the east; much like the UFO shown in one of the recent Navy videos.  I thought it was as far away as the satellites.