Divergent Paths

At one of our son's home the other morning I happened to step out the front door and look up in time to see this: Three jets on divergent paths, each with a vapor trail marking their route away from the others. In the cold morning sunshine it took me a few moments to recognize what was happening above me, then a few moments more to open my cell phone for a couple of pictures. After looking into the sun shining brightly in my screen and hoping upon hope the camera had captured the action in the skies over my head, I stepped back and watched all three aircraft go their own way and wondered where they were going and from whence they had come. When first I spotted them, they appeared so close that it fleetingly crossed my mind that they might have each just appeared there, then started from a mutually agreed upon point in the sky. That is what made me stop and watch them. Yes, I know it was all an optical illusion, that in reality they had thousands of feet, maybe even miles between t...