On AA Platinum and higher flying intl (even in Y) get access to Flagship Lounges but NOT Admirals Clubs. When DL opens FC lounges I wonder what the rules will be?
And
At this point, DL has made no indications they are going to open any Flagship style lounges. DL Gold and higher (Skyteam Elite Plus) get access to DL Sky Clubs when flying intl (except Caribbean) even in Y, so situation is somewhat similar on DL.