商業軌道輸送サービス
The proposal made with Constellation Services International for Commercial Orbital Transportation Services in 2006 was not selected.$150 million was the planned development cost, as part of a $700 million project (that included a space tug). 100 launches per year were needed to be profitable. One third of the launches were by design allowed to fail. Target costs were $1 million per launch or $1000/kg to LEO.