"The program intends to build and fly a novel class of hypersonic aircraft to reinforce national security by offering short-notice and low-cost access to space."

"The program intends to build and fly a novel class of hypersonic aircraft to reinforce national security by offering short-notice and low-cost access to space." - DARPA and Boeing are working on the XS-1 program, a next-generation spaceplane that can potentially fly towards the edge of space.