germanwings (4U, Cologne/Bonn) will expand its operations in Dortmund and add several other new routes: Cologne/Bonn-Sarmellek: 2x weekly A319-100 service starting on June 18 Dortmund-Munich: 3x daily A319-100 service starting on October 28 Dortmund-Split: 2x weekly A319-100 service starting on October 30 Dortmund-Zagreb: 4x weekly A319-100 service starting on October 28 Stuttgart-Belgrade: 3x weekly A319-100 service starting on May 24