Silver Sphere In Contrails Over Albuquerque, New Mexico

At the end of February 1999 when I was in Sedona, Arizona to speak at a conference, several of us went outside to go to lunch. But we were stopped cold by what was in the sky -- a large silver airplane at high altitude was making a perfect and very large white X in a very blue sky. The X stretched from the western horizon up to and past the zenith. A huge X. Then we realized there were other large Xs in the sky. And within a couple of hours, the sky was totally overcast. A couple of days later in Phoenix, I saw similar Xs in a blue sky that later became overcast.