Originally Posted by
findark
It's murky, but if you all originate on the same PNR when you apply the instrument originally, the waitlist priority should be inherited if you subsequently split the PNR.
But it often fails. Post-split, companion may be listed based on own status, which is of course not supposed to happen. This happened to me last week. Didn't matter, as there was only one open seat (I was #2, companion was #16).