Four astronauts are on their way to the International Space Station after being sidelined by Boeing's Starliner trouble and other issues. SpaceX launched the U.S.

The four U.S., Russian and Japanese astronauts pulled up in their SpaceX capsule after launching from NASA's Kennedy Space Center in Florida. They will spend at least six months at the orbiting lab, swapping places with colleagues up there since March. SpaceX will bring those four back as early as Wednesday.

After a scrubbed launch on Thursday, four astronauts lifted off from Florida and will dock at the International Space Station on Saturday.