The SkyTeam carrier is one of the world's largest operators of the Airbus A350 family.
Delta's Dreamliners will serve long-haul routes across the globe.
Delta has owned every major variant of the 767 series and currently maintains the largest existing fleet of the jet family.
Delta's 717 fleet is soon to be retired, and the airline will be replacing the type's operations with the Airbus A220 family.