Yep. I live near a major international airport. I see lights in the sky all the time. The last time I walked out my back door, I counted four moving lights - th

Yep. I live near a major international airport. I see lights in the sky all the time. The last time I walked out my back door, I counted four moving lights - three that were obviously airplanes, and one that was far enough that my eyesight couldn't resolve the obvious red/green blinks, nor the tell-tale airplane shape. But what else is on an approach to a runway, following the others?