So what was the end result? Hopefully you didn't have to overnight in ATL, as there should have been five or six DL/AF/KL flights to AMS/CDG from ATL and then tons of options on AF/KL onward to MUC. With the joint venture, it wouldn't matter whose metal you're on. Definitely no chance that they'd send you over to LH in such a case, especially since LH would have to route you via FRA.