I was flying from Dallas to San Jose and we passed just north of Area 51. I had a window seat and could see the runway in the distance. I happened to look down and say a large black teardrop shape going over the ground. That area is covered with small salt deposits and the object really stood out against the white of the salt deposit. I could tell that is was very close to the ground. It was moving very slow (almost like hovering) but was moving toward Area 51. I really believe that it was Aurora as it looked like all the artical drawings I have seen. Since I was on a commerical flight I was only able to observe the object for a very short period of time. I did not have a camera (I do carry one with me at all times now) so I did not get a picture. All the articals talk about how fast the Aurora can go so I was very surprized to see how slow it was traveling.