Delta has a decent sale for travel between Atlanta and Munich over the Christmas period both for non-stop travel and via Atlanta. These fares can be booked with Air France/KLM codes that increase significantly the earnings in terms of MQDs and RDMs.
Christmastime in Austria and Germany is a magical time of the year with plenty of markets across the country with modern versions such as Tollwood in Munich (Review here) or Salzburg and the town where Silent Night was first sung 200 years ago... In Munich you can also explore the Munich Airport Visitors Park while in Bavaria you can find Schloss Linderhof , Oberammergau and Schloss Neuschwanstein (Sleeping Beauty Castle)
ATL-MUC would earn 14391 MQMs 3838 MQDs 2.25 MQD Ratio
Delta Diamond members would obtain 42214 RDMs, Platinum 34538 RDMs, Gold 30701 RDMs, Silver 26863 RDMs, Base 19188 RDMs