According to an official statement, the updated launch window gives NASA additional time to assess the functioning of the International Space Station following recent repair work in the aft section of the Russian Zvezda service module, where a leak had been detected.
No new target time has been announced for the Falcon 9 launch, which will carry a four-person crew aboard the Dragon capsule.
This means that Sunday remains the earliest possible date for the astronauts to board the spacecraft - though that too could still change.
The Ax-4 crew has been in pre-mission quarantine for nearly three weeks. NASA says the mission can still lift off before the end of June, depending on the outcome of ongoing safety evaluations.
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Source: Space X/Axiom Space/IAR