http://news.yahoo.com/hypersonic-rocket-...44494.html
EXCERPT: Oxfordshire-based Reaction Engines are developing a new aerospace engine class that combines both jet and rocket technologies. They call it the greatest advance in propulsion since the jet engine; potentially revolutionizing hypersonic flight and dramatically reducing the cost of space access. [...] SABRE, which stands for Synergetic Air-Breathing Rocket Engine, is designed to enable aircraft to operate from a standstill on the runway to hypersonic flight in the atmosphere, and then transition to rocket mode for spaceflight....
EXCERPT: Oxfordshire-based Reaction Engines are developing a new aerospace engine class that combines both jet and rocket technologies. They call it the greatest advance in propulsion since the jet engine; potentially revolutionizing hypersonic flight and dramatically reducing the cost of space access. [...] SABRE, which stands for Synergetic Air-Breathing Rocket Engine, is designed to enable aircraft to operate from a standstill on the runway to hypersonic flight in the atmosphere, and then transition to rocket mode for spaceflight....