Hartsfield-Jackson Atlanta International Airport, the world's busiest airport, is divided into several concourses, each serving a variety of airlines. Concourse B, in particular, is a key hub for domestic flights, with Delta Air Lines dominating the scene due to its significant presence in Atlanta. What Airlines fly out of Concourse B in Atlanta? If you're planning a trip that departs from or connects through Atlanta, it's helpful to know which airlines operate out of Concourse B. Understanding this can save you time and improve your overall airport experience, making your journey more seamless.tent