Originally Posted by
ieChicago
PointsPlus priority does not require you to be on the same flight. If you request an upgrade using your PP, your companion will be on the upgrade list at the end of other 1Ks. Slightly different to being on the same booking, where they will appear immediately after you, but still ahead of other members.
I would not recommend your suggested approach for the return trip - your companion has a good chance of losing the E+ seat assignment.
The PP upgrade waitlist is based on status, fare class and time of request. The OP’s companion will be behind all Silvers and higher with instrument supported (PP and miles/copay) upgrades, but ahead of CPU of 1K, Platinum, Gold and Silver.