If you're flying through Atlanta, knowing the layout of Hartsfield-Jackson Atlanta International Airport (ATL) can make your journey smoother. What Airlines fly out of Concourse B in Atlanta? As one of the world’s busiest airports, ATL is divided into multiple concourses, each serving different airlines and flights. Concourse B, located in the Domestic Terminal, is a central hub for both frequent travelers and those passing through. In this guide, we’ll explore which airlines operate out of Concourse B and what you can expect when navigating this bustling section of the airport.