The return of two Boeing Starliner astronauts to the International Space Station is being delayed again, NASA says. Butch Wilmore and Suni Williams traveled to the space station aboard Boeing’s Starliner in June for a trip that was expected to last eight to 10 days. They are supposed to return to Earth in a SpaceX capsule, but that capsule needs more work, which is why the astronauts’ return date is being pushed back.