Delta offers six tiers of onboard service: Basic Economy, Main Cabin, Delta Comfort +, First Class, Delta Premium Select and Delta One. Delta seat selection is available to all passengers, with the exception of those flying its cheapest airfare, Basic Economy.

Delta Air Lines offers six distinct cabin experiences, categorized by level of service and comfort. Starting from the most basic, there is Basic Economy, which is a value-driven seat with no flexibility. Next is Main Cabin, the standard economy experience with slightly more perks. Above that is Delta Comfort+, which provides extra legroom and dedicated overhead bin space. For medium and long-haul flights, Delta offers Delta Premium Select, a true premium economy cabin with wider seats and deeper recline. For domestic and short-haul international business, there is First Class. Finally, the pinnacle of their service is Delta One, which features full lie-flat beds, chef-curated meals, and individual suites with privacy doors on most wide-body aircraft. It is worth noting that not every flight features all six classes; for example, smaller regional jets may only have First Class and Main Cabin, while the newest Airbus A350s are the primary vessels for the full suite of Delta One and Premium Select options for international travel.