Delta is a member of the SkyTeam alliance and the provide many of their own benefits to elite members of partner frequent flyer programs.
SkyTeam member China Southern is offering U.S. frequent flyers a status match — all you need to be is “an elite member of any other airline” (emphasis mine).
Email China Southern if you want a status match. Provide your China Southern frequent flyer account number (you’ll need to open one) and proof of your current airline status. Your matched status will be valid through February 2019.
United Golds and above, and American Platinums and above, will receive China Southern’s Sky Pearl Gold which is SkyTeam Elite Plus status. They’ll match even first-tier elite status (like United Silver) with their own Silver (SkyTeam Elite). And they’ll even match status from other SkyTeam programs.
SkyTeam Elite Plus status gets priority check-in and boarding, extra baggage allowance, and lounge access when flying international economy. If you’re in business class you have lounge access anyway and unlike Star Alliance and oneworld status flying their respective U.S. airlines with SkyTeam you don’t get lounge access on Delta domestic flights.
However this is useful to have for boarding and checked bags if you’re an elite with a competing airline but sometimes fly Delta economy.
(HT: Loyalty Lobby)