nasa:

Our Commercial Crew Program has worked with several American aerospace industry companies to facilitate the development of U.S. human spaceflight systems since 2010. The goal is to have safe, reliable and cost-effective access to and from the International Space Station and foster commercial access to other potential low-Earth orbit destinations.

We selected Boeing and SpaceX in September 2014 to transport crew to the International Space Station from the United States. These integrated spacecraft, rockets and associated systems will carry up to four astronauts on NASA missions, maintaining a space station crew of seven to maximize time dedicated to scientific research on the orbiting laboratory

We begin a new era of human spaceflight as American astronauts will once again launch on an American spacecraft and rocket from American soil to the International Space Station.

As part of our Commercial Crew Program, NASA astronauts Robert Behnken and Douglas Hurley will fly on SpaceX’s Crew Dragon spacecraft for an extended stay at the space station for the Demo-2 mission. Launch is scheduled for 4:33 p.m. EDT on Wednesday, May 27.

Demo-2 will be SpaceX’s final test flight to validate its crew transportation system, including the Crew Dragon spacecraft, Falcon 9 rocket, launch pad and operations capabilities. While docked to the space station, the crew will run tests to ensure the Crew Dragon is capable of remaining connected to the station for up to 210 days on future missions.

Our Commercial Crew Program is working with the American aerospace industry as companies develop and operate a new generation of spacecraft and launch systems capable of carrying crews to low-Earth orbit and the International Space Station. Commercial transportation to and from the station will provide expanded utility, additional research time and broader opportunities for discovery on the orbiting laboratory.

The station is a critical testbed for us to understand and overcome the challenges of long-duration spaceflight. As commercial companies focus on providing human transportation services to and from low-Earth orbit, we are freed up to focus on building spacecraft and rockets for deep space missions.

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