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Beside the Pegasus rocket, owned by Northrop Grumman, aimed for first flight in 2020, Stratolaunch will build a medium and medium-heavy rockets, with the former set for a 2022 flight, as well as a fully reusable space plane, now in early development.
The space plane concept would apparently be capable of taking payloads up and down from orbit, and could therefore become the first totally reusable launch capability.
Overall, it does appear that the company, unable to find someone else to design its upper stage, has been forced to do it itself.