Published by the Royal Aeronautical Society on January 15th, 2016:
“Large global areas such as Alaska, the Canadian Arctic and Siberia have isolated northern areas lacking road or rail access. Other nations with infrastructure gaps include Brazil, sub-Saharan Africa and parts of Asia where torrential rains wash out bridges and make roads impassable. Air transport offers the only year-round connections to many of these remote areas.” by Barry E Prentice and Robert Knotts
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