Originally Posted by
drewguy
It's been a while, but my recollection from splitting is that if you initiate the split you tend to get the new PNR, meaning the companion keeps the first-in-time priority based on original booking date.
I can confirm that exactly this happened to me a couple weeks ago. I had a 4 pax reservation that I split into two pairs; my pair got a new confirmation code while the other pair retained the original, and was placed higher on the list.
Interestingly, neither PNR was further split at check-in for either flight. Is this phenomenon dead?