Originally Posted by
drewguy
Solution you may be able to use - book both your outbound flights from your miles and your return from her Chase URs. Then you'll both be on the same PNR in each direction, though you'll have different PNRs for outbound and return. That's of small consequence though, because at least for UA points you can refund them to your account for free. Chase URs you're at risk any way you do it.
Well if the Chase ticket is an underlying cash ticket, you likely won't be able to do that as two one-ways without a significant cost penalty.
98% of the time there will be no issue being on separate reservations. I think UA is generally good about extending elite benefits to companions on separate reservations, if that's of concern here.