The contingency plan means that NASA astronauts Barry “Butch” Wilmore and Sunita “Suni” Williams will hitch a ride home on SpaceX’s rival Crew Dragon capsule during a mission slated to launch in late September. That would put them back on US soil in February, when that capsule is slated to return and months later than originally planned. Their empty Starliner capsule will undock in a week or two and attempt to return on autopilot.

NASA went into its commercial crew program a decade ago wanting two competing U.S. companies ferrying astronauts in the post-shuttle era. Boeing won the bigger contract: more than $4 billion, compared with SpaceX’s $2.6 billion.

With station supply runs already under its belt, SpaceX aced its first of now nine astronaut flights in 2020, while Boeing got bogged down in design flaws that set the company back more than $1 billion. NASA officials still hold out hope that Starliner’s problems can be corrected in time for another crew flight in another year or so.