Driving on us-81 between minneapolis, ks & delphos, ks we noticed 5-6 lights in a straight line. never noticed that before, so we decided to stop & take a look. as we watched the lights they kept moving in a diagonal direction and disappearing at the same point where it looked like a faint or obstructed light. as we watched we saw 12 lights appear, travel to the point and disappear. not sure how many did the same before we stopped to watch. they appeared to be a great distance away.