A Japanese organisation is working on a hypersonic jet that could travel two and a half times as fast as Concorde.

In a test carried out by the Japan Aerospace Exploration Agency (JAXA), researchers installed an experimental aircraft inside a ramjet engine testing facility at JAXA's Kakuda Space Center in Miyagi Prefecture, Interesting Engineering reports.

They simulated flight conditions at Mach 5, which is roughly five times the speed of sound.

The trial was a big success, validating the aircraft's thermal protection system, control surfaces, and ramjet combustion performance under extreme hypersonic conditions.

Such tests are crucial for the legitimacy of such an aircraft, as temperatures surrounding the aircraft can soar close to 1,000 °C at that speed.

The next phase of the program might involve mounting the experimental aircraft onto a sounding rocket or similar launch vehicle for a real-world Mach 5 flight demonstration, it has been reported.

Japan's hypersonic research efforts are part of a bigger global race to develop ultra-high-speed transportation systems. If the JAXA plane makes it into the air, it could cut the flight time from Tokyo to the US down to two hours. Currently, it takes around half a day to make the journey on a typical commercial aircraft.

The aircraft would do this, in part, by rising to very high altitudes of around 17 miles, more than double that of a conventional aircraft.

A Mach 5 hypersonic passenger plane would fly at about 3,300 mph, roughly six times faster than a normal plane.

The supersonic Concorde passenger jet operated until 2003, but its speed topped out at about Mach 2. It's maximum recorded speed was 1,400mph.

As exciting as the aircraft is, it'll be a long time before it's up in the air, and even longer before anyone is flying in it.

Hideyuki Taguchi, a professor at the Tokyo University of Science, told Mainichi: "Developing a conventional aircraft typically takes about 10 years. Since the development of hypersonic passenger aircraft requires two stages of demonstration -- an experimental aircraft followed by a passenger aircraft -- we hope development can be completed in about 20 years."

Tetsuya Sato, a professor at Waseda University, added: "This result is still only a first step. Our dream is to connect it to a flight demonstration."