Lufthansa (LH/Frankfurt) will launch several new routes later this year:
Dusseldorf-Sarmellek: weekly seasonal CRJ-200 service starting on April 14

operated by Eurowings (EW/Dortmund)
Hamburg-Sarmellek: weekly seasonal CRJ-200 service starting on April 14

operated by Lufthansa CityLine

... (CH-Aviation)