Unfortunately, Admirals Club one day passes are only usable at Admirals Clubs, not other airlines' lounges. (The good part is if one is connecting in MIA from somewhere with Admirals Clubs, one can use the same pass - e.g. STL-DFW-MIA-BCN, one could access Clubs at STL, DFW and MIA.)
AENA (the airport operator) does provide for access to their lounges at BCN for €25.00, but these may be only for departure and not arrivals - so if you are arriving at BCN from MIA and going on in six hours, or you are seeking a lounge for your AA departure, and have no oneworld Sapphire or Emerald status and are departing on a oneworld flight or/and are not in Business class, paid access in the AENA lounge in your departure terminal would be the best bet.
Originally Posted by
anngi
Is it possible to buy a MIA AA one day lounge pass and then also use it in BCN since BCN would be the first overnight destination? I have a 6 hour layover in BCN and it would be nice to spend it in a lounge. If not, is it possible to buy a BCN pass once I arrive for any club nearby.