Space.com By Mike Wall 4/19/2019
NASA officials attributed the delay to constraints imposed by the ISS and orbital mechanics.SpaceX has pushed back the launch of its next robotic resupply mission to the International Space Station (ISS) by four days, to April 30.
The California-based company's Dragon cargo capsule is now scheduled to lift off atop a Falcon 9 rocket at 4:22 a.m. EDT (0822 GMT) on April 30 from Florida's Cape Canaveral Air Force Station, NASA officials announced today (April 19).
"SpaceX will take advantage of the additional time to perform a static fire test and pre-flight checkouts," NASA officials wrote in an update. "Falcon 9 and Dragon are on track to be flight-ready for an earlier launch attempt; however, April 30 is the most viable date for both NASA and SpaceX due to station and orbital mechanics constraints."
More:
https://www.space.com/spacex-dragon-cargo-launch-delayed.html
