Delta Air Lines differs from its US ‘big three’ rivals, American Airlines and United Airlines, in that its widebody fleet does not feature only Boeing designs. Indeed, while the Atlanta-based SkyTeam member does fly both the 767-300ER and 767-400ER, the A330neo and A350 families represent the future of its twin-aisle operations. While earmarked for long-haul flights, the A330neo does also see domestic use.