Interesting.
The US has been working with hypersonic designs for a long time...and testing several of them.
I know China has tested Hypersonic aircraft over the last few years as well.
On 2004, the US successfully tested the experimental X-43 ramjet/scramjet aircraft developed with NASA. The aircraft was attached to a Pegasus booster and then attached to a B-52 fro flight tests.
In the fall of 2004, three test flights were conducted.
First pic is of the B-52 taking off with the Pegasus booster under one wing and the X-43 there on the end of the booster:
The second pic is of the B-52 in flight with the Pegasus and X-43
3rd picture shows the B-52 dropping the Booster and X-43 away from the aircraft.
4th picture is the Pegasus booster igniting with the X-43 on the end.
5th picture is the Pegasus booster accelerating away from the B-52
Ultimately, the Pegasus booster releases the X-43 and falls away and the ramjet/scramjet activates, powering the aircraft into Hypersonic flight.
In these tests the X-43 achieved Mach 8.63
Here's how the X-43 looks alone:
See my
.