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In page West Berlin:
"Air traffic was the only connection between West Berlin and the Western world that was not directly under East German control. On 4 July 1948, British European Airways opened the first regular service for civilians between West Berlin and Hamburg.[1] Tickets were originally sold for pounds sterling only.[citation needed] West Berliners and West Germans who had earlier fled East Germany or East Berlin, and thus could face imprisonment on entering East Germany or East Berlin, could only take flights for travel to and from West Berlin.[2] To enable individuals threatened by East German imprisonment to fly to and from West Berlin the West German government subsidised the flights.[citation needed]
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