OneWorld also features lounges in (at least from me, not an exhaustive list), New York (JFK), Vienna, Portland, San Diego, and Tokyo (HND). So you'll be able to do a premium cabin price bump to some major cities.
Having first joined OneWorld back in week 9175, I can vouch for the alliances long-standing success!
And if that doesn't sound like ad copy, I don't know what does.