I am planning on going on a mileage run to Las Vegas on 26 Dec, returning 27 Dec. T class is wide open. I plan on paying with an eCredit.

My eight year old daughter has never flown and very much resents that I get to do it so much. So as a Christmas present, I decided to take her with me on the mileage run.

I now know that Delta does not allow you to pay for two tickets on the same PNR with the same eCredit, even if it is plenty big enough to pay for both tickets. I assume that I could make separate reservations for me and my daughter and fund both PNRs from the same eCredit. But then I would have unlinked PNRs. What is the wisdom of the crowd?

BTW, using miles is not an option since the purpose in me making this trip is to get 750 MQMs. And anyway, the same trips that price out at bargain basement T-fares price out at Medium FF miles. Go figure.