Imagine having a late breakfast in Europe and then dinner in Australia, all in the same day. (No time zone trickery involved.) And imagine, too, paying no more for that junket than you would for a current business class ticket. That's the kind of itinerary, and pricing, promised by Reaction Engines, a U.K. company working on the design of a hypersonic aircraft called the A2. It's an ambition that runs on liquid hydrogen fuel.

http://www.news.com/2300-11397_3-6229267-1.html?tag=ne.gall.pg