The split is a hassle I usually have to deal with on family travel (I do revenue to get the miles + bonus, do award for some of the family). But seems no way around it. Some agents will "link" the records but I don't really know what that means, and it seems that by the time the list is handed off to the airport the link is no longer there? Not clear on the last part, would be curious if anyone who knows more cares to comment.