If I split the PNR, then I think the following is most likely:
- I get upgraded.
- He gets bumped to E-.
- I can't call and get his E+ seat back as I'm now in C.
16AB are
nice seats on the 767, so I think I'm going to leave us on one PNR (SWUs applied and we're now waitlisted).
- If we both clear ahead of time or at the gate, great.
- If we both don't clear ahead of time or at the gate, fine.
- If I clear at the gate and he doesn't, he's OK in 16A.
Life ain't perfect.

Thanks for the input.
Originally Posted by
1KChinito
If you two are not in the same PNR, when the computer does a sweep, yes, your son may lose his E+ seat. All you have to do is call UA and get his E+ seat back.
The key here is what is more important to you:
1. Sit together with your son in E+ or
2. Upgrade from Y to C
Of course, most of us want both. If you have to choose one of the two, which one will you choose?
If you choose #1, then leave everything alone and stay in one PNR. If you choose #2, then split your PNR.