NewYears between 3am and 4am. We were leaving work, heading to my truck when I looked in the clear sky to the north, We seen flat black object. I called it the wing. It appeared it wasnt moveing. Then it was infront of us. I said its on silant mode,there was no sound. Their was a large thunderhead to the south of us, it headed twards the large thunderhead and tuned on a tweenty to thirty degree angle and slowly went into the cloud. It was as big as the cloud. We watched the front of the v shaped wing go into cloud on a angle until we could see the two ends went in. Thats why it appeared to be flat.It would have been 5 to 10 times the size of a large jet aircraft.