books.google.pt - 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. Hundreds of carriers--both small and large, government...http://books.google.pt/books/about/Encyclopedia_of_African_Airlines.html?hl=pt-PT&id=KBmGpaD36cMC&utm_source=gb-gplus-shareEncyclopedia of African Airlines
