CAPE CANAVERAL, Fla. (AP) NASA decided Saturday its too risky to bring two astronauts back to Earth in Boeings troubled new capsule, and theyll have to wait until next year for a ride home with SpaceX. What should have been a weeklong test flight for the pair will now last more than eight months.

The seasoned pilots have been stuck at the International Space Station since the beginning of June. A cascade of vexing thruster failures and helium leaks in the new capsule marred their trip to the space station, and they ended up in a holding pattern as engineers conducted tests and debated what to do about the trip back.

After almost three months, the decision finally came down from NASAs highest ranks on Saturday. Butch Wilmore and Suni Williams will come back in a SpaceX spacecraft in February. Their empty Starliner capsule will undock in a week or two and attempt to return on autopilot.

As Starliners test pilots, the pair should have overseen this critical last leg of the journey, with touchdown in the U.S. desert.

It was a blow to Boeing, adding to the safety concerns plaguing the company on its airplane side. Boeing had counted on Starliners first crew trip to revive the troubled program after years of delays and ballooning costs. The company had insisted Starliner was safe based on all the recent thruster tests both in space and on the ground.

Retired Navy captains with previous long-duration spaceflight experience, Wilmore, 61, and Williams, 58, anticipated surprises when they accepted the shakedown cruise of a new spacecraft, although not quite to this extent.

Before their June 5 launch from Cape Canaveral, Florida, they said their families bought into the uncertainty and stress of their professional careers decades ago. During their lone orbital news conference last month, they said they had trust in the thruster testing being conducted. They had no complaints, they added, and enjoyed pitching in with space station work.

Wilmores wife, Deanna, was equally stoic in an interview earlier this month with WVLT-TV in Knoxville, Tennessee, their home state. She was already bracing for a delay until next February: You just sort of have to roll with it.

There were few options.