Boeing is aiming a test flight of its unmanned CST-100 Starliner capsule next year.
And, a potential launch of its crewed spacecraft at the end of 2022.
The CST-100 had been scheduled to fly to the ISS from Cape Canaveral, Florida, on August 3.
It was aborted hours before the launch because of issues with propulsion system valves.
Boeing officials said they were still conducting testing of the valves.
They may have become stuck because of moisture or condensation.
Boeing was forced to remove the spacecraft from the Atlas V rocket.
It was sent to a factory at the Kennedy Space Center for troubleshooting of the valves.
Boeing built the Starliner under contract with NASA to ferry astronauts to low Earth orbit.
