Topline SpaceX canceled a ship launch Wednesday that is part of a mission to bring back two astronauts who have been on the International Space Station for nine months after the Boeing spacecraft they arrived in was deemed unsafe over helium leaks and thruster issues.

The replacements for NASA’s two stuck astronauts launched to the International Space Station on Friday night, paving the way for the pair’s return after nine long months. Butch Wilmore and Suni Williams need SpaceX to get this relief team to the space station before they can check out.

SpaceX's Crew-10 mission has successfully launched from NASA's Kennedy Space Center in Florida at 7:03PM Eastern on March 14. NASA astronauts Anne McClain and Nichole Ayers, Japan Aerospace Exploration Agency's Takuya Onishi and Roscosmos cosmonaut Kirill Peskov are onboard and will join the ISS crew after the spacecraft docks with the orbiting lab at 11:30PM Eastern time on March 15.