Boeing Experimental Spaceplane XS-1 (Phantom Express spaceplane)

DARPA has selected Boeing to complete advanced design work for the Experimental Spaceplane XS-1. The XS-1 program envisions a fully reusable unmanned vehicle, the Phantom Express spaceplane, which would take off vertically like a rocket and fly to hypersonic speeds to the edge of space. Upon reaching a high suborbital altitude, the booster would release an expendable upper stage able to deploy a 3,000-pound satellite to polar orbit at a cost of $5M. The reusable first stage would then bank and return to Ear
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