Boeing's Starliner launch was postponed due to an issue with the oxygen relief valve on the Atlas V rocket's upper stage.
The CST-100 Starliner mission, Boeing's first attempt to transport astronauts to the ISS, faces delays after years of setbacks and cost overruns.
If successful, Boeing can certify its Starliner for human transportation, fulfilling its $4.2 billion NASA contract, alongside SpaceX's Crew Dragon missions.
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