As a OW Emerald customer connecting on an all American Airlines flight from the US to Germany (DFW-BOS-LHR-TXL), will I have access to the BA lounge in Boston or will I have to spend 4 hrs in the Admirals Club? I searched but could not find relevant material, apart from what the OW guide says, according to which I should be able to do so--just want to make sure. Thanks.