• DARPA's concept follows decades of reusability dreams by space advocates. The space shuttle is the most famous operational attempt at reusability, but that system could only be partially recycled. For example, new external tanks were manufactured for every mission, and a certain number of tiles on the re-entry protection system had to be replaced after each flight.
  • The XS-1 (Experimental Spaceplane 1) is envisioned to heft payloads for less than $5 million a flight, each weighing between 3,000 and 5,000 lbs.
  • The aircraft-like craft is also supposed to fly faster than Mach 10, or 10 times the speed of sound.

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