75-100 Light formation over Vacaville, California

Dec04, 2020, 1813hrs. Vacaville, CA.
While walking my dog, I looked up to see 75-100 lights moving from West to East across the sky, parallel to HWY 80 in California. Approx 5-10 miles North of it.
The lights, from my angle, were the same size and brightness as Saturn is right now. They were traveling at slow speed. They were in-line formation. For the most part, they were almost the all the same distance from one another, in line, for the exception of 4-5 which were above or below the line.
They traveled at a speed similar to a small-engine plane.
By the time they flew over (approximately) central Vacaville they disappeared one by one, once they arrived to the exact same location in the sky.
The Travis Air-Force Base is close-by, and so is the Nut Tree Private Airport. We are used to many different aircraft here, and have NEVER seen this phenomenon. No other aircraft was seen in the sky at this time.  This was witnessed by myself(walking my dog) as well as my family(from my house around the corner)