Because NASA rotates space station crews approximately every six months, this newly launched flight with two empty seats reserved for Wilmore and Williams won’t return until late February. Officials said there wasn’t a way to bring them back earlier on SpaceX without interrupting other scheduled missions.

Col. Nick Hague, a Space Force Guardian and NASA astronaut, launched Saturday from Cape Canaveral Space Force Station in Florida alongside Roscosmos cosmonaut Aleksandr Gorbunov as part of the SpaceX Dragon Crew-9 mission.

NASA and SpaceX cleared their Crew-9 astronaut flight to the International Space Station for launch, a Sept. 28 liftoff that will help return two Boeing Starliner astronauts home.