I have family members flying ORD-LHR-DME. The ORD-LHR segment is on AA, and I have used SWUs to upgrade them. LHR-DME is on BA - non-upgradeable and therefore in Y. I assume they can get into AC at ORD. Does anyone know if also they get any special treatment at LHR, e.g., lounge access in T5? Priority transfer and/or security? My guess is that the answer is no, but it never hurts to ask fellow travelers. Thanks!