DUS must be one of the routes with lowest load factors as it was one of the two remaining routes served regularly with Sun Air's 19seat Jetstream until a year or so ago (together with Bergen). I enjoyed quite a few nice rides in the Jetstream, earplugs included. It was always big fun to watch the faces of unsuspecting travellers with no prior experience on that route when the bus pulled up in front of the tiny prop in BA livery.