NASA on Tuesday swapped out the astronaut capsule it plans to use for an upcoming routine flight to the International Space Station, a scheduling move that will allow a slightly earlier return for two Starliner astronauts who have been on the station far longer than expected.

The Crew-10 astronauts must arrive at the International Space Station before Williams and Wilmore, who are currently assigned to the Crew-9 mission, can complete their rotation on the orbiting laboratory and head back to Earth.