Originally Posted by
aster
Since it's a return flight then no problemo, just make sure you have the check-in agent change the FFP details before the second flight.
It might be an entirely different story with a connecting flight though, where I'm not sure it's possible to credit one leg to one FFP and the next one to a different FFP.

Thanks for the info. I think I'll do that because I'm lacking 6100 miles for my KF, so 1 way should get my approx. that.