Privately-designed space capsule ready for another test launch
16 May 2012 Last updated at 18:38 BST
Since Nasa's shuttle fleet retired in July 2011, Russia's Soyuz spacecraft has been the only way to get crew and supplies to and from the International Space Station.
But California-based company SpaceX hopes to change that with the successful launch of their rocket Falcon 9 and their unmanned Dragon Capsule later this month.
Tom Santorelli reports.