The SpaceX capsule will eventually bring home Butch Wilmore and Suni Williams, the NASA astronauts who piloted the Boeing Starliner test flight.

The Crew-9 incident was the second Falcon 9 upper-stage issue to crop up in less than three months. On July 11, the rocket experienced a leak of liquid oxygen in its upper stage during the launch of 20 of SpaceX's Starlink internet satellites. As a result, the spacecraft were deployed too low and ended up being lost.

It’s not a rescue mission, but the two astronauts left behind by Boeing’s Starliner at the International Space Station will soon welcome their new ride home with the arrival of a SpaceX Crew Dragon that made a historic launch from Cape Canaveral Space Force Base on Saturday.