Thanks for your reply bedelman. I actually called AA last night to confirm and that's exactly what they told me, that the ticket should have been reissued and that they thought it was in progress. I have been asked to call Meeting Services back this morning to see if there is any pending action on my end. They told me that indeed the bag allowance should apply on the whole JFKLHRCDG and that's probably what I'll see on the new ticket. They also confirmed that practically speaking I will check my bags all the way through and that the JFK-LHR allowance should then apply.