I looked and found a similar post, but didn't get my question answered, so here it is.
I am Onepass gold and Skymiles gold, and have already requalified for Onepass gold next year. I want to top off my DL account with a CO flight I'm taking this weekend, but don't want to sit in the back. The upgrade has already processed, and my questions is: Has anyone had success changing to a partner's FF # after getting their upgrade with their Onepass #, while at the same time retaining their seat up front?
If so, at what point and where should I change my FF #? Thanks FT!