Hypersonic jet WaveRider is to bear other assessment flight on top of the Pacific Ocean aiming to attain Mach 6.
At this speed - more than 4,300mph (6,900km/h) - it could journey from London to New York in about an hour.
The plan is saved by the Pentagon and Nasa, and is segment of skeleton to rise faster missiles.
During a assessment in June 2011, WaveRider journeyed at Mach 5, but unsuccessful to attain the aim speed.
It is a of a few projects now beneath way to emanate a hypersonic aircraft.
The investigate could moreover be used to erect a blurb plane, able to attain ample aloft speeds than today's jets, after Concorde was decommissioned in 2003.
A B-52 bomber will lift the wingless unmanned jet from US Edwards Air Force Base in California to 50,000 feet (15,250m).
The qualification will then be dropped, and after a giveaway drop of about 4 seconds, its engine is ostensible to ignite.
X-51A WaveRider should then ascend to 70,000ft (21,300m) and finally attain Mach 6.
The Mach number is the proportion of the speed of an intent to the speed of sound. Mach 1 is the speed of sound - roughly 768mph, depending on assorted factors inclusive heat and altitude.
So Mach 6 is 6 times the speed of sound. Concorde's cruising speed was Mach 2 - it flew from London to New York in only over 3 hours.
The WaveRider assessment flight is approaching to final for about 5 minutes. At the finish of it, the plane will break in to pieces and drop in to the Pacific.
The assessment is basically a repeat of final summer's attempt, when the hypersonic plane reached Mach 5, but the engine unsuccessful to attain full power.
European aerospace and counterclaim hulk EADS believes that hypersonic newcomer flights are likely to be present in the nearby future. In 2011, EADS presented its own idea of a blurb high-speed plane written to fly at Mach 4.
"The business residents who longed for to be in New York in 3 hours done Concorde rarely viable, and now there's fascination on both sides of the Atlantic to burst a era and go from supersonic flight to hypersonic flight," EADS' vice-president of business development, Peter Robbie, told the BBC.
"Such an plane will be really expensive, of course, since the massive amounts of appetite that is compulsory to obtain to such speeds.
"But the idea of going from Tokyo to Paris in two-and-a-half hours is really popular is to business and diplomatic residents - and we regard that by about 2050, there might be a viable blurb aircraft."
In Aug 2011, US army scientists attempted to obtain other unmanned hypersonic initial plane to attain Mach 20 - 20 times the speed of sound.
However, they mislaid meeting with the Falcon Hypersonic Test Vehicle 2 (HTV-2) after it had distant from its rocket.
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