Originally Posted by
MrJBoy
My FB account number is already attached to my air tickets, and I don't want to lose lounge access and other benefits if I want to earn DL miles because I don't have an elite status with DL.
What is the best way to swap my accounts?
AFAIK you would get a DL FFP account, and then call them and ask them to change the number in the booking. Regarding the benefits, I would say it is sufficient if you just show your Plat card whenever relevant (check-in, lounge) and, if necessary, explain that the number in your booking is DL's FFP.
Of course, this approach comes with the risk that someone will not honour your FB status, but I would say this is a pretty small risk if you are friendly and polite. In any case, once you have checked in with your FB number in the booking, chances are basically zero that FB will transfer your miles to DL's FFP.