Delta already had separate joint ventures with AF/KL and VS. It sounds like this will now be a single joint venture for all four airlines. I think those most likely to benefit are VS/AF/KL customers, particularly elites, who will have more trans-Atlantic options based on this statement. "Enhanced customer benefits starting Feb. 13 mean that loyalty program members will be able to earn and use miles or enjoy elite benefits for flights on any of the four airlines’ worldwide operations..." I could see this being especially useful for VS elites in the UK for travel to mainland Europe.