My senior friends will be flying in Sept from SFO to VCE via FRA. They have enough UA FF mileage to bump up to BC. She called UA to make arrangements to fly LH to FRA (for the bed seats in Business), and UA stated that LH will not accept the UA FF mileage! I was under the impression that LH was part of the Star Alliance, and that there was cooperative mileage exchange between members of all the Airline Alliances. Can someone please enlighten me, as I do not my friends to have to basically "sit up" for the long flight. Thank you.