Boeing and Sierra Nevada Corp. are in the midst of key tests and final critical design reviews (CDR) as NASA prepares to award Commercial Crew Transportation Capability (CCtCap) contracts under the second phase of its plan to certify a U.S.-developed means of transporting astronauts to the International Space Station starting in 2017.
A s Lockheed Martin’s Atlas 5 rocket gains traction in the commercial launch market, Russia’s threat to restrict sales of its RD-180 engine could get in the way.