2012-10-07 - Vista, CA - Triangle

I was out on my porch that faces south. Wind 1-2 mph from east, scattered puffball clouds. Night sky Illuminated by city lights. I saw what looked similar to a airplane gliding from north to south. It was very hard to make out as it seemed translucent and made no sound as it faded into the night sky. I thought maybe 3 large birds flying in formation as there was some lighter coloring at the center and on the outer tips. But looked more like a triangle glider with no lights and cloaking ability. To be honest it left me with an uneasy feeling. I scanned the city lit sky for the object but it never came into view again. Also note that there was a high presence of military air traffic.