NASA announced on Tuesday the postponement of the SpaceX mission set to transport astronauts to the International Space Station (ISS) due to unresolved issues with Boeing's Starliner spacecraft. The decision comes as Boeing's Starliner remains docked at the ISS since early June, following the detection of propulsion system anomalies during its flight.

The SpaceX flight, originally scheduled for mid-August, was intended to deliver the Crew-9 team, comprising four astronauts, to relieve the current Crew-8 members on the ISS. However, with the two additional astronauts aboard the Starliner still stranded due to the spacecraft's technical problems, NASA has had to adjust its plans.

The new tentative launch date for the Crew-9 mission is September 24. This flight might include bringing back the two stranded astronauts along with two Crew-8 members, allowing Boeing more time to address and resolve the Starliner’s issues.

"This adjustment allows more time...to finalize return planning for the agency's Boeing Crew Flight Test currently docked to the orbiting laboratory," NASA stated in a blog post. The Starliner, which also encountered helium leaks, could return without a crew if the safety issues are not mitigated.

NASA and Boeing are continuing to assess the spacecraft’s readiness, and no definitive return plan has been set for the Starliner yet. The space agency has scheduled a press conference on Wednesday to provide further updates on the Crew-9 mission and the status of the Starliner spacecraft.