The two astronauts onboard Boeing‘s first manned spaceship were supposed to be home already but have had their push date pushed back yet again, this time without a new date proposed.

Boeing’s Starliner launched on June 5 after many delays, and when it reached the International Space Station, 28 thrusters went out, causing docking difficulties. Since then, flight commander Butch Wilmore and pilot Suni Williams have been putting out various fires, including helium leaks. Now, all but one thruster is back online.

NASA said they are delaying the return to ensure they’ve thoroughly inspected the propulsion system.

“We are taking our time and following our standard mission management team process,” Steve Stich, manager of NASA’s Commercial Crew Program, said in a statement. “We are letting the data drive our decision making relative to managing the small helium system leaks and thruster performance we observed during rendezvous and docking.”

This is Boeing’s first manned mission and has been long in the making. Ten years ago, NASA hired Boeing along with Elon Musk’s SpaceX to bring astronauts to and from the space station. The contract with Boeing ran the space agency $4.2 billion.

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The capsule can safely remain docked at the orbiting laboratory for 45 days, which would be mid-to-late July. A spacewalk is scheduled for July 2, so a return won’t happen before then.

Still, the program manager of the program, Mark Nappi, said Wilmore and Williams’s feedback about the Starliner has been “overwhelmingly positive.”