Originally Posted by
rwoman
Is it possible VS and DL could agree to using DL GUCs/miles to fly VS metal? Yes.
Also important to keep in mind VS premium economy seats (at least the ones I've seen) are similiar to domestic F, although I'd probably only book PE if I knew I was in a window or aisle since layouts include middle seats.
Given VS don't offer their own top tier FF's certificates like this I can't see them allowing DL FF'rs to use them...