I live in the Atlanta, GA area and I picked up a previously owned Eton Elite Executive and while putting it through its paces I came across aircraft on 135.375. I could not find this frequency in my notes and a search of the RR database listed only three locaations, one in minnesota and two in Texas. I did hear a Delta flight that was from Savannah, GA to Atlanta, so I guess it's a new Atlanta Center frequency.