Spacecraft is set to make its first trip to the International Space Station (ISS)
To do so when it launched two years ago and experiencing malfunctions since.
The Test Is Uncrewed
But if successful, it will mark an important step in expanding the capability for sending astronauts to orbit from US soil – something only SpaceX can do at the moment.
NASA And Boeing
Are aiming for the launch to take place at 22.54 GMT on Thursday 19 May from Cape Canaveral in Florida.
The Starliner, A Reusable Spacecraft
Designed for crewed trips to low Earth orbit, will launch without a crew on top of a United Launch Alliance Atlas V rocket
It will eventually make its way to dock with the ISS.