Concourse B is one of seven concourses (A, B, C, D, E, F, and T) at Hartsfield-Jackson, each of which connects passengers to different airlines and destinations. Located centrally in the airport’s layout, Concourse B primarily caters to domestic flights and serves as one of the critical nodes for Delta Air Lines, the dominant carrier at ATL. https://allairportsoffices.com..../what-airlines-fly-o