Two objects joined, then split apart and one released a small light.

I saw two objects just after sunset as I was driving home.At first, they appeared to be airplanes, although they seemed to join together and form one large, hovering craft, about 2000 feet up.  Then, after about ten minutes, they split again. One advanced northward, and the other remained in a hover mode, perhaps advancing slightly northward.  I then saw a very small light leave the remaining craft, and it fluttered downward erratically, kind of like a spark.
As I arrived home, this second craft advanced forward again, and I noticed it was shaped somewhat like a plane, but all the lighting was white and steady.  There were no blinking red and greens that are normally seen on the wing and tail sections of a plane.
As I watched it slowly move northward, it appeared not to have a body or shape.  It was as if lights were arrayed on an invisible craft.