Flying Saucer Over Stockton, Ca

My wife, daughter ,niece and myself were at the twin drive in theaters in Stockton,Ca.in 1977 to see the remake of the movie "King Kong". I had seen the original made in the 30's and was looking forward to seeing this one with all its special effects.The screen we would see the movie on was facing west .Dusk approached and the theater started its advertising.Get your fresh popcorn,drinks,etc.. The main movie was preparing to start. At that time I was working at the Stockton Airport,employed by San Joaquin County. As a kid I had always loved airplanes and it was a treat to work at a place where you could talk to pilots and people interested in aviation. Some people never look up at the sky but for some reason if I'm outdoors I'm always scanning .I saw a craft coming from the west heading southeast .At first I thought it was just a small airplane. I noticed some lights but they were not compatible with any aircraft I had seen .My interest turned from the movie I really wanted to see to something in the sky. At some point I mentioned it to my wife,daughter,and niece.They were somewhat absorbed in the movie which is logical .We didn't come there to watch the night sky .I became totally involved watching this craft which skirted the drive in and seemed to be heading over downtown Stockton,Ca.I remember saying "I bet the guys in the tower (Airport) are looking at this thing". They didn't have radar back then but it wasn't a busy airport.They had lots of time to observe visually ...