Finding Which terminal is Delta at Atlanta Airport? Delta Air Lines operates out of Terminal S and provides a gateway to international locations. It is a gateway to a variety of experiences and first rate amenities not just a terminal. Terminal S combines luxury dining with business including amenities like the Delta Sky Club and private lounges. Travelers are guided through the terminal with ease by clear understandable signage. Traveling to a new destination or making a quick connection is made easier with Delta presence at Atlanta Airport. Every little thing about Terminal S makes traveling more enjoyable for passengers. It is a shining example of modern travel.