San Jose, CA Jan 2,2003 2 black triangles flying above 30,000 feet. Hovering very slowly. heading east, then west.Near dusk, but the sky was still bright blue. I saw two black, triangles hovering in a very slow flight pattern. They did not fly like our planes or birds. I watched for 10 minutes as they headed from the east to the west and then slowly, back toward the west again. They moved closer together, progressively and appeared to be about 45,000 feet, or possibly higher. Several jumbo jets passed by at maybe 15-20,000 feet during my observation, and these objects were clearly not flying like the planes, nor did they look anything like any kinds of planes I have ever seen. I am a private pilot and am familiar with flight patterns through the skies in this area. I have also observed many birds of prey (hawks,and others, in this area and these objects were not like this animals. This is the first time I have ever observed anything like this. I have always been extremely skeptical about UFO's and have not really thought they were anything but mistaken identities. However, these objects were clearly some kind of object that I could not identify. I am wondering if anyone else observed them today.