Rocketplane Kistler (RpK) was a reusable launch system firm originally based in Oklahoma.
NASA announced that Rocketplane Kistler had been chosen to develop crew and cargo launch services.
[2] Rocketplane Kistler's primary project was the K-1, a reusable launch vehicle which was intended to get as high as geosynchronous orbit, and was hoped to compete with relatively expensive, one-shot rockets for servicing of the International Space Station.
[5] In February 2006, Kistler was purchased by the majority owner of Rocketplane Limited, Inc, a competing reusable, private spacecraft firm.
[12] In February 2007 RpK renegotiated its COTS agreement, agreeing to raise the $500 million of required private financing before the end of May.
[13] On September 7, 2007, NASA notified Rocketplane Kistler that the COTS agreement would be terminated in 30 days due to continued inability to meet its financial milestones.