https://wccftech.com/spacex-nasa-crew-1-flight-delayed/

SpaceX's Falcon 9 and Crew Dragon inside the Launch Complex 39A hangar prior to going vertical on the stand. Image: SpaceX

In a blog post and through the Twitter page of its Administrator, the National Aeronautics and Space Administration (NASA) confirmed that the agency and SpaceX were set to launch the first operational American launch to the International Space Station (ISS) this weekend. The pair, whose first manned launch from U.S. soil earlier this year broke a dry spell of nine years, had planned to launch four astronauts under the 'NASA SpaceX Crew-1' mission tomorrow at 19:49 ET. However, NASA also revealed that following the mission's Launch Readiness Review (LRR) the launch is now targeting its backup window of 19:27 ET on Sunday.