not a single mention of American Airlines anywhere in the airport - maybe you get a mumble from the flight attendant in the boarding briefing
If one is American, "Ya gotta say ya have lotsa flights, all ya can legitimately claim alliance with." I'm sure AA claim all the frequency they can from their BA partnership in OneWorld.
I'm certain the wonderfully spoken and politically correct BA flight attendants welcome all the OneWorld flyers - even Aussies - on board all the BA flights, even those from London City! All those AA miles add up ya know, for all the qualifying flights!