No, not all international flights at Hartsfield-Jackson Atlanta International Airport (ATL) depart from the Maynard H. Jackson Jr. International Terminal (Terminal F). While Terminal F is the dedicated home for many international carriers and most long-haul arrivals, many international flights operated by Delta Air Lines and its partners actually depart from Concourse E, which is also equipped with international gates. In fact, Atlanta’s airport is unique because all of its concourses (T, A, B, C, D, E, and F) are connected airside by the "Plane Train" and a walking tunnel. This means you could check in at the Domestic Terminal (West) and still reach your international flight at Concourse E or F without leaving the secure area. However, it is vital to know that if you are arriving in Atlanta from an international destination and it is your final stop, you must exit through the International Terminal to clear Customs and Border Protection, regardless of which concourse your plane physically docked at.