Because of faults with Boeing’s Starliner, Suni Williams and Butch Wilmore had to wait months for a ride back to Earth on a different spacecraft.

Boeing's troubled Starliner capsule that left two NASA astronauts on the International Space Station last year may need to fly a third uncrewed test flight before it carries astronauts again, agency officials said as the spacecraft's first crew had to return to Earth on a SpaceX capsule this week.