Now slated for liftoff at 7:03 p.m. ET Friday (2330GMT), the Crew-10's arrival to the ISS on Saturday night will allow the return of Wilmore and Williams, two veteran NASA astronauts and U.S. Navy test pilots who in June 2024 were the first humans to test-fly Boeing's Starliner spacecraft to the ISS in June.
But problems with Starliner's propulsion system during its flight to the ISS delayed what was expected to be an eight-day stay. NASA deemed it too risky for the astronauts to fly home on the Boeing craft, which led to the current plan to bring them home in a SpaceX capsule.
It has also become entangled in politics as President Donald Trump and his adviser Elon Musk, SpaceX's CEO, claim without evidence President Joe Biden left "Butch and Suni" on the station for political reasons.