It recently went hypersonic during a recent test off the Southern California coast, where it managed to fly at over five times the speed of sound. This air-breathing engine managed to defy conventional wisdom as it smashed its previous time in flight record by remaining in the air at hypersonic speeds for three minutes, allowing it to travel coast to coast in under 40 minutes with the possibility of making deep-space exploration a possibility. Defense agency DARPA is definitely going to see how such technology can be further advanced in the coming years, with one of the goals being the capability to achieve global-range, maneuverable, hypersonic flight at Mach 20.