German airline Lufthansa CityLine, a subsidiary of the nations flag carrier operator Lufthansa, served as the launch customer for the CRJ100. Throughout the type's production life, it continued to be a major customer of the CRJ series. During 2001, following Lufthansa's acquisition of 25 per cent of regional airliner Eurowings, the airline ordered 15 CRJ200s with options for 30 more as part of a strategic move towards fleet commonality with Lufthansa Skyline.[17][18]