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A Delta One upgrade means upgrading to one of the most exclusive cabins in the world (and Delta). Entitles you to the airline's top-of-the-line premium service on international flights and select long-haul domestic flights. Delta One cabins offer spacious lie-flat seats with direct aisle access, high-quality cuisine, complimentary access to Delta Sky Club lounges and use of Sky Priority services. Among other things, you'll receive priority check-in and boarding, expedited security checks, and exclusive baggage handling services.