what are they hiding?

http://uk.news.yahoo.com/london-sydney-spaceflight-edges-closer-162046726.html

commercial airliner with the potential to fly at 8'493.76ms^-1 (19000mph)
at the moment a commercial airlines maximum altitude is 12'192 meters,
the speed of sound at this altitude  is 295.1ms^-1, (anyone who doesn't know, speed of sound depends on the mediums ability to transmit vibrations, higher up = less densely pact air molecules = slower transmission)  this is constant up till 20000 meters
This means that the planned airliner will be flying at 28.78 times the speed of sound (possibly  more, the article says "upper atmosphere" (clearly written for morons who have no idea about the different levels of atmosphere, but i assume it means the upper troposphere  (max altitude of 17000m))

if this technology is becoming commercially available, and it is well known that military technology leads commercial technology, and the fastest (official) horizontal military flight was an UNMANNED jet flying at 5'811.52 ms^-1, what sort of aircraft do the military have that they're not sharing?

and what would they need to move that fast?