Black triangle craft with 3 dull white lights at each point

I Came outside to smoke a cigarette at 11:32 pm. Looked up at the western sky and seen some strange looking vapor trails. Then i notice 3 lights moving across the vapor trails approaching from the north headed south. Not moving fast but high up in altitude. As it moved closer i made out a black triangle craft. The lights were at each point of the craft. moving south doing a odd see saw motion. It faded out quickly in the distance. It was absolutely incredible to witness.