Private companies in China and America are achieving hypersonic speed in aircraft — speeds categorized as those which exceed five on the mach scale, which equates to 3,835 miles per hour or above. At this speed, an aircraft could travel the circumference of the Earth in approximately 6 and a half hours.
We could see this speed attained and made commonplace within the next few years, with estimates stretching from 2020 to 2030. Alan Bond, a co-founder of Reaction Engines, said that this could be "a revolution in transportation equivalent to the jet engine."
It is only now that we really have the technology required to overcome the extreme heat (surface temperatures exceed 1,000 degrees Celsius) and changes in air that occur at these ludicrous speeds. as well as developing ways to introduce them into common usage by tackling factors like the deafening boom caused by breaking the sound barrier.
Among the most prominent companies working on this is Lockheed Martin, whose SR-72 will reportedly be used to carry out surveillance missions as a successor to the SR-71 blackbird. The company announced earlier this month that it would begin production.