The science fiction-like speed of Mach 6 is equivalent to an aircraft to flying from New York to London in less than an hour, CNN reported Tuesday.
If all goes as planned, the latest test of the platypus-nosed X-51A Waverider will end with a dive into the Pacific Ocean Tuesday.
X-51A sports an engine with virtually no moving parts and uses oxygen from the atmosphere for fuel.
Dan Wasserbly of the military analysis publication IHS/Jane's said the military could use such an aircraft in two realms.
"They could use it to develop cruise missile-like weapons that could reach a target on the other side of the plant in minutes instead of hours, as well as developing aircraft which could put a quick-reaction force on a far-off battleground within hours instead of days," Wasserbly said.
The Air Force and the Pentagon aren't saying much about the X-51A except that it was conceived in 2004.
The kind of speeds X-51A is able to reach cannot be achieved with current jet-powered technology.