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.

Butch Wilmore and Suni Williams will not leave the ISS before Wednesday, NASA reported, pending weather conditions at splashdown sites near Florida.

Four SpaceX astronauts blasted off in a SpaceX Falcon 9 rocket Friday afternoon to the International Space Station to rescue two stuck NASA astronauts.