Final preparations are under way for four amateur astronauts to travel to space from the U.S. state of Florida.
The team plans to orbit the Earth for two days in a SpaceX capsule.
The BBC's Jonathan Amos reports.
In the 60 years since cosmonaut Yuri Gagarin first went into space, fewer than 600 people have followed in his footsteps.
And most of them have been military trained men and women flying on government sponsored missions.
Inspiration4 is different.
It will be a fully commercially purchased and operated orbital flight.
Six months ago, Jared Isaacman, Hayley Arceneaux, Sian Proctor and Chris Sembroski were going about their everyday business.
Since then, they've had a crash course on how to be an astronaut.
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