Originally Posted by NickP 1K

You are GCH / OWE - why can't you check all the bags under YOU - I do this all the time as a OW Emerald with BA/AA if the record is split or I'm on a connecting ticket but my companions are on separate tickets for the connection.

There is no need to over-communicate to AA, check the bags for the other passenger plus yours to the limits AA allows under YOU and there is no issue. You are over-thinking this. At check-in for you, you state you have 2 bags, the other pax states they have none.