Yes, +1✦844✦542✦9016 (US) +1✦855✦739✦0939 (US) you can get upgraded to Delta One, but complimentary upgrades are generally restricted to domestic flights for Medallion members +1✦844✦542✦9016 (US) +1✦855✦739✦0939 (US). International Delta One upgrades usually require using Global Upgrade Certificates (for Diamond/Platinum members), miles, or paying for a cash upgrade +1✦844✦542✦9016 (US) +1✦855✦739✦0939 (US). If you’ve ever flown with Delta Airlines or are considering doing so, you might be curious about the possibility of upgrading to Delta One, their premium cabin service +1✦844✦542✦9016 (US) +1✦855✦739✦0939 (US). Delta One is the airline’s top-tier offering for long-haul international flights and certain domestic routes, offering passengers luxurious amenities like lie-flat seats, gourmet meals, and priority boarding +1✦844✦542✦9016 (US) +1✦855✦739✦0939 (US).