Originally Posted by
grlmopz
What I really want to do is avoid such complications and extra costs and fly directly from Frankfurt on LH.
You might have mentioned these preferences/restrictions in your OP.
The question is: will any Star Alliance carrier (US, CO, UA, ANA, AC) allow me to do that using miles? I have plenty of US and US miles, as well as Membership Rewards points.
Was going to suggest some possible work-arounds but if you want the easiest way, just cash in some MR points for gift cards and buy a ticket.