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In page Mary Bailey (aviator):

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She then made the 8,000 mi (7,000 nmi; 13,000 km) journey back between September 1928 and 16 January 1929.[citation needed] The return journey involved flying across the Belgian Congo, then along the southern edge of the Sahara and up the west coast of Africa, then across Spain and France back home again.[6] It was the longest solo flight and longest flight accomplished by a woman that far.[7][8] This feat won her the 1929 Britannia Trophy.[9]