Originally Posted by paperwastage

Do you have united/star alliance status?

Don't believe there's a RDU-FRA nonstop flight, so you're connecting somewhere in CONUSA first, the trans-atlantic business class leg is operated by LH? If LH, then no access at RDU unless you have status (you have access to UC/Polaris at the airport where the transatlantic business class LH flight departs)