http://aviationweek.com/defense/amid-sr-72-rumors-skunk-works-ramps-hypersonics?NL=AW-05&Issue=AW-05_20170928_AW-05_558&sfvc4enews=42&cl=article_2&utm_rid=CPEN [login to see] 94&utm_campaign=11913&utm_medium=email&elq2=fdeba775645444ea8710e [login to see] 8
Hypersonic transport. How long until we figure out the tech to break the next travel barrier - speed of light?