Blackcloud

I remember years ago after a meeting of the CEos of oneworld where they addressed how the alliance was being weakened by these out of alliance deals.
Besdies saying that there was nothing in the OW agreement prohibiting this the comment, IIRC CX CEO that the codeshares within the alliance did not really bring in extra business because the nature of the alliance where members give reciprocal benefits. Out of alliance codeshares increased the potential passenger base.
Of course with the way FFP have developed where travelling on other metal does not provide the same benefit as a codeshare flight this argument seems moot or very outdated.