Lufthansa
Surprised Lufthansa haven't got a daily service to Munich. I have to drive regularly to Manchester where they have three flights a day often using A321 so big demand. Far more connections from MUC than DUS plus it's the gateway to the Alps and opens up so many ski resorts in Austria, Germany, Switzerland and Italy and very popular in summer too. A flag carrier will always have a much bigger chance of success than a loco on a route like this. EasyJet could work due to It's brand presence at both NCL/MUC and focus on business pax but Jet2 would would only generate outbound tourist pax.