While I fly WN frequently, my son doesn't rack up the RR credits like I do. He is however, sitting at 13 credits, and we have a roundtrip booked where he will earn credits 14 and 15 in the near future.

I am an Amex member, and have used Membership Rewards to top off my account in the past. Would it be possible to transfer to his account? He is is not an additional card user (as he is a younger child).

Alternatively, is there an easy way to get 1 RR credit through an existing promotion or partner for him?