My wife and I have a YYZ-SFO flight booked in U class and we have confirmed I seats. Both of us are SEs. We would like to use two NAU, both under my name.

We have two friends traveling on the same flight as we, but not on the same PNR. They have no AP status. The question is, if they bought U fare and there are I seats, can I sponsor them to get the upgrades? I have 6 NAUs but my wife didn't pick her NAUs as her SE choice.

In this case, I would have to use 4 NAUs in my name to sponsor my wife (SE) and 2 friends (Basic members). Is it allowed? I know I can sponsor one person but don't know if I can sponsor 3. Of course I can sponsor one friend and my wife can sponsor the other but she only has SWUs and we don't want to burn 2 SWUs on a NA flight where we can use NAUs...

Any advice?