27L and 9R are the same runway, always. 27R and 9L are the same runway. In Atlanta, besides 27L/9R and 27R/9L, there's also 26L/8R and 26R/8L, as well as the 28

27L and 9R are the same runway, always. 27R and 9L are the same runway. In Atlanta, besides 27L/9R and 27R/9L, there's also 26L/8R and 26R/8L, as well as the 28/10 you mention. See https://aeronav.faa.gov/d-tpp/2213/00026AD.PDF https://aeronav.faa.gov/d-tpp/2213/00026AD.PDF