Metal triangle seen over Boeing field in 1980.

During the first week of April 1980 I saw at 2am a black triangle hovering over the north end of Boeing field near Georgetown just south of Seattle Washington. I was driving in my car on I-5 when I saw what appeared to be a craft as large as a jet fighter with heavy metal struts and no lights on floating soundlessly about 200 feet in the air.  I wanted to stop and observe it but it was as if emanations of fear surrounded the craft.  It seems emanations of forgetfulness also came off the machine because I forgot about it until two weeks later when a small article in the Seattle Post Intelligencer reported that a triangular craft was spotted by several people near the Boeing plant between Edmonds and Everett.  It seemed to me that either Boeing had developed an antigravity device or had a balloon that looked like it was made of metal or that Boeing was being observed by some sort of an alien craft. After 24 years I still have no answers to these questions.
Date is approximate.  PD