There is this $35,000 Japanese helicopter, which is said to be the world's smallest helicopter, able to carry one person. At that price, and considering there are millions of potential buyers, congestion in the skies cannot be ruled out.
However, before this becomes a reality, global warming and oil scarcity will make sure it does not happen.
Link:
http://www.gen-corp.jp/product/categories/p1.html
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