which airline maintains hubs at Berlin Tegel Airport and Düsseldorf Airport and continues to work with Kosovo Airlines?
Kosova Airlines:  The airline however continues to work with other airline companies flying into Pristina, such as Germanwings, LTU, Air Berlin and a few others. Air Berlin:  It maintains hubs at Berlin Tegel Airport and Düsseldorf Airport and serves 12 German cities as well as destinations in Europe, the Caribbean and the Americas.
Air Berlin