UFO Sighting in Nevada on December 2nd 1981 – large self-luminous 747 sized disc military aircraft flew overheard turned around then left

In 1981 while driving across Nevada, I saw a large 747 sized self-luminous light-blue non-identified aircraft with military insignia and a us air force emblem flew directly overhead heading North at a height of aprox 500ft. At a distance of aprox 2000ft it did a 180�� turn and flew away over the mountain tops. I suspect there could have been an encounter because a few weeks later I had a dream of an encounter with unknown men in an unknown area surrounded by mountains with terrain similar to that observed while the craft flew by.