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From DARPA: "The objective of the XS-1 program is to design, build, and demonstrate a reusable Mach 10 aircraft capable of carrying and deploying an upper stage that inserts 3,000- 5,000 lb. payloads into low earth orbit (LEO) at a target cost of less than $5M per launch. The XS-1 program envisions that a reusable first stage would fly to hypersonic speeds at a suborbital altitude. At that point, one or more expendable upper stages would separate and deploy a satellite into Low Earth Orbit. The reusable hypersonic aircraft would then return to earth, land and be prepared for the next flight. Modular components, durable thermal protection systems and automatic launch, flight, and recovery systems should significantly reduce logistical needs, enabling rapid turnaround between flights."
DARPA said that the long-term intent is for XS-1 technologies to be transitioned to support not only next-generation launch for government and commercial customers, but also global reach hypersonic and space access aircraft.