Having re-qualified for ExecPlat weeks ago, I have a few revenue flights before year end. I'd like to put those miles into my BA and QF accounts for redemption purposes, though keep at least one segment for my AA account. Is this possible by asking the lounge agent to change the FF number after I fly the AA credited segment? I've done this will UA and AC with no issue, but US refused to do it saying it wasn't possible. Never tried with AA.