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In page West Berlin:
"The West German airline Lufthansa and most other international airlines were not permitted to fly to West Berlin. Flights by Lufthansa or the East German airline Interflug servicing connections between East and West Germany (such as between Düsseldorf and Hamburg in West Germany and the East German city of Leipzig) began in August 1989, but these routes had to go through Czechoslovak or Danish airspace.[citation needed]
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