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.

NASA’s two stuck astronauts may end up back on Earth a little sooner than planned. The space agency announced Tuesday that SpaceX will switch capsules for upcoming astronaut flights in order to bring Butch Wilmore and Suni Williams home in mid-March instead of late March or April.