As noted here and here, it is already been in use for decades by the US and Russian military. The civilian airplane makers and the US tax payer that developed it are not using it. There are fuel savings of 10-30%, which would also lower the cost of airplane tickets.
Brian Wang is a Futurist Thought Leader and a popular Science blogger with 1 million readers per month. His blog Nextbigfuture.com is ranked #1 Science News Blog. It covers many disruptive technology and trends including Space, Robotics, Artificial Intelligence, Medicine, Anti-aging Biotechnology, and Nanotechnology.
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