Vintage Krug, kudos, I believe you are right in principle according to One World policy. Having done some research I believe AA staff are trained on the AAdvantage policy based on AAdvantage membership rules which are not the same as One World rules. This would suggest that technically you would be correct however my experience is you are fairly likely to get bounced as was the original poster. Maybe Stevescootes could try printing out
http://www.oneworld.com/ow/ffp/lounge-access#the-oneworld-lounge-access-policy and see if it helps. Being an AAdvantage EXP it does not help me though.
MartynSinclair, I would not argue with your logic and indeed Hawaiian do give you access when flying first even if only Inter Island.