Lufthansa Cityline was originally Lufthansa's regional brand— not unlike what United Express is to United. But, in a more recent effort to circumvent union issues, LH management started flying some longhaul flights on the Lufthansa Cityline certificate with Cityline crew. The planes have a lot more seats in them and are all painted in Star Alliance livery instead of the usual LH colors, and the crew are paid less than LH mainline, but otherwise, it should be the same LH service and not much of a noticeable difference from any other flight.