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  Encyclopedia of African Airlines - Ben R. Guttery - Google Books

  https://books.google.de/books?id=vVr8AAAAQBAJ

  The rainy season, terrain, and financial hardships have made the construction of highways and railroads nearly impossible in many parts of Africa. This lack of modern infrastructure has been overcome in some part by the development of air transportation.…

• 

  Encyclopedia of African Airlines - Ben R. Guttery - Google Books

  https://books.google.de/books?id=KBmGpaD36cMC

  The rainy season, terrain, and financial hardships have made the construction of highways and railroads nearly impossible in many parts of Africa. This lack of modern infrastructure has been overcome in some part by the development of air transportation.…

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