Triangle object no lights no sound

I just saw the ABC speicial and had goosebumps. 
Approx 1984-85 I was living in Longview,Texas..in town in a residental area. It was a clear night and I had went outside comming out of the garage into the driveway facing east. 
I looked up and saw a large Triangle shaped object fly directly overhead at a low altitude (500 -1000 Feet?}. It's flight path was aprox south-west. There where no lights but I could clearly see the outline of the craft against the night sky. 
There was no engine noise at all but I could hear the craft push the through the air, almost like a glider. This was no glider..It was flying under power. I had only told two people this. Then tonight (2-24-05} when the ABC special was comming on I told my 9 year old daughter what happened. Then I saw on the special about the triangle crafts that made no sound..WOW.
Witness indicates that date of sighting is approximate.  PD