With Turkish Airlines, Interflug had signed an agreement, by which the two airlines were established as the only ones to offer dedicated flights for Turkish "Gastarbeiter" to and from West Germany and West Berlin. With KLM, Interflug set up a partnership for a joint operation on the East Berlin-Amsterdam route during the 1980s. Of the six weekly flights, two were operated by KLM's Fokker F28 Fellowships, and four by Interflug's Tu-134s and Il-62s. As neither airline was entitled to cross the intra-German border, the KLM flights were routed via Denmark, and Interflug chose a southern routing over Czechoslovakia.