Dear All,

I hope all is well.
I am currently on my way to gain XPs on flying blue to get to Gold (thanks to a multitude of NYC-PAR flights). Also, i am flying a significant amount of US domestic flights on Delta.
Here is the thing I cannot answer though (and i apologize if this has been answered before):
What is the process to gain XP when booking flights on Delta ? The FB website says to use my FB number when booking a flight on Delta but it auto-populates my Delta Skymiles, even having saving a partner program in the delta system.

thank you for the help.

S