My wife and foster son were at a fire pit in our back yard in Northern Ky. I notice the first light coming from the south east in a slow steady pace and made mention to the others that this light looked odd and wasn't a plane due to the redish constint glow of it's light. They both made mention it being a plane but I refused to take what they said and explained how planes have navigational lighting of red and green on either wing and flashing. Also I said they were moving way to slow. I first saw it around 11:30 pm. Then a second and third one came into view from the same direction and were all moving at the same slow speed and in a uniform spacing. I would estimate that the objects were approx. 10,000 to 15,000 feet above the ground and couldn't have been more than 15 miles South of Lunken airport and maybe 20 miles west of CVG. A fourth object appeared following a longer distance from the first 3. They were moving mostly in an East direction but a little towards the South. They all four moved slowly in from our left as we watched, which was in a more southerly direction but still heading a bit east. We watched this for approx. 5 minutes until they all went from sight. At the end of the event we all 3 talked of this odd thing that just happend. The 4 objects glowed of a redish color but never flashed/blinked at all. I did contact our local police and explained what we saw. I have never seen anything like this and I'm sure that what we saw not a normal flying object. I would have to believe that one of these 2 airports I mentioned should have picked this up on their radar. Please keep me posted. Ken