Boom (YC W16) – Supersonic Passenger Airplanes
Very interesting and relevant article about the American Concordes which never flew:
<a href="http://www.bbc.com/future/story/20160321-the-american-concordes-that-never-flew" rel="nofollow">http://www.bbc.com/future/story/20160321-the-american-concor...</a>