Numerous lights moving in a single file seen in the nighttime sky

Numerous lights that were the size of a typical size star in the nighttime sky were seen by myself and my wife.  The lights moved about the speed of a jet plane, perhaps a little faster.  The lights were all in a single row following each other in unison and spaced exactly the same distance from each other, perhaps 4-5 seconds apart in their travel speed.  The seemingly endless amount of lights kept appearing one by one out of the NNW skies, somewhat over the Louisville International Airport, and moved to the ESE one by one until each one would fade out of view. After about 5 minutes of viewing this event, the last light appeared out of the NNW and finally faded out of view to the ESE as all the other lights did. I do not know how long this event occurred because when I stepped outside and looked up into the sky as I normally do each evening the lights were already there. My wife and I watched them for about 5 minutes or so. No sounds emanated from the lights a! nd none of the lights were blinking, they were each just a steady whiteish-yellowish light. The elevation was hard to estimate, but they appeared to be at least as high as a commercial jetliner, perhaps much higher. They definitely were not close to the earth however. I would estimate that we witnessed 60-100 lights in the 5 minutes that we watched them. Though I did not witness this, my wife said at one point that some of the lights in the single line of lights split into a V-shape and came to a stop for 5-6 seconds and immediately began traveling the exact opposite direction.