Two Nasa astronauts are due to head for the International Space Station aboard a new spacecraft.
Boeing’s Starliner will blast off from Cape Canaveral in Florida, in its first crewed test flight.
The mission has been delayed for several years because of setbacks in the spacecraft’s development.
If it is successful, it will become the second private firm able to provide crew transport to and from the ISS, alongside Elon Musk’s SpaceX.
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