The Daily Mail (UK) reports that “the US Defense Advanced Research Projects Agency (Darpa) is now entering the second and third phases of its ambitious program, which aims to make launching satellites a daily occurrence.”  

“The XS-1 will be an airplane-like vehicle that can fly to the edge of Earth’s atmosphere and quickly boost small satellites into orbit.”  

“After this, it will land, refuel, load up another satellite and take off again within 24 hours. The goal of the next phases is to take the program beyond studies to flight tests.”