Nasa decided that it would not take even a small risk in bringing back Butch and Suni on Starliner, when they had the option of returning them on SpaceX's Dragon capsule. Nasa decided the best option was to do this during a scheduled crew rotation, even though it would mean keeping the astronauts on the space station for several months.

The Crew-10 mission will send four astronauts to the space station to take over for Butch Wilmore and Suni Williams’ crew, finally allowing their return home.

SpaceX launched the Crew-10 mission to the ISS today (March 14) to relieve the 'stuck' Starliner astronauts and two other crewmembers aboard the orbiting lab.