US President Donald Trump, witnessing the launch Saturday of the SpaceX Falcon 9 rocket on a historic first private crewed flight into space, said of the event: "It's incredible".
But this is not the first time NASA astronauts will wear an Omega X-33 on a mission.
NASA astronauts Bob Behnken and Doug Hurley have successfully reached orbit aboard a SpaceX spacecraft, the culmination of the better part of a decade of work. The pair will stay at ISS for four months. They'll be joining NASA astronaut Christopher J. Cassidy and Russian cosmonauts Anatoly Ivanishin and Ivan Vagner.
The expedition by NASA's Doug Hurley and Bob Behnken marks almost a decade since the US last participated in space travel and Space X's first successful launch with humans. It's also the first private, commercially built manned spaceflight.
Aerospace company Boeing is also working on a spacecraft that would be used in the same way.
A SpaceX Falcon 9 rocket lifted off from the Kennedy Space Center at 3:22 p.m. EDT on Saturday for the journey to the space station.
SpaceX's Demo-2 mission will get another chance at a launch today, May 30.
Since ending its Space Shuttle programme in 2011, Nasa has depended on Russia's space agency Roscosmos to transport its astronauts to the space station.
SpaceX's Dragon aced all of its objectives, while Boeing's Starliner capsule ended up in the wrong orbit and was nearly destroyed because of software errors.