E+ is the answer for me. LH is not very good in economy. The seats are too close and it is impossible to book a good seat ahead of time. I use to fly LH DEN-FRA roundtrip every month when I was buying C, but I will not fly them in coach.

I was told by a United exec that DEN-NRT is the most profitable United flight operating out of Denver. I think there is a market for a TATL flight.