Takeoff was slated for Wednesday evening from Kennedy Space Center in Florida, but the company waived off the launch attempt because of an issue with the launchpad’s ground system. The problem stemmed from a hydraulics system used to control one of two clamps that hold on to the upper portion of the rocket as it sits vertically on the ground pad before launch.

The astronauts’ eventual arrival at the orbiting laboratory will clear the way for the return of NASA astronauts Barry Wilmore and Sunita Williams

The Crew-9 mission, consisting of NASA astronauts Nick Hague, Suni Williams and Butch Wilmore, along with Roscosmos cosmonaut Aleksandr Gorbunov, is set to return to Earth after a brief handover period with the newly arrived Crew-10 expedition crew, pending weather conditions at the splashdown sites off the coast of Florida.