The crew-swap mission will enable NASA’s Butch Wilmore and Suni Williams to return home from the International Space Station.

NASA astronauts Butch Wilmore and Suni Williams arrived at the ISS aboard Boeing's Starliner spacecraft last June. The duo were flying the capsule's first crewed flight test, which was expected to stay in orbit for about 10 days before flying the pair back to Earth.

A SpaceX capsule carrying a fresh crew to the space station launched Friday, setting the stage for the Starliner astronauts to finally come home.