I wasn't aware of any BA ban on giving miles in other oneworld programs for these segments. I recall flying BA between SCL and EZE a few years ago when that service was offered, and had the flight credited to my CP account in one direction, and my AA account on the return. [This was during one of those wonderful100K promos for flying 5 or 6 oneworld partners.] I thought the prohibition was only on transAtlantic flights, not their "stumps"?