Originally Posted by
Gig103
...bonus that the points from her business charges would be lumped in with our personal balances (she currently has no Amex/MR of her own)....
I expect that she uses a card that earns
some type of rewards?
If she opts for Delta Reserve she will earn Skymiles rather than Membership Rewards points. Is that where you want to go with your points? (I am finding Virgin Atlantic Flying Club miles better than Skymiles for domestic Delta flights.)
Adding her as an Additional Cardholder on your Platinum card opens up the ability to transfer to her frequent flyer accounts.