The first attempt to launch NASA astronauts Butch Wilmore and Suni Williams in early May ended in a scrub after a faulty liquid oxygen valve on the United Launch Alliance Atlas V rocket required replacing. ULA replaced the valve, and the rocket is in the hangar at Cape Canaveral Space Force Station in Florida ready for the next launch attempt.However, during the rocket repair, Boeing said it began working on an issue with the spacecraft.
"As that work proceeds, NASA’s Commercial Crew Program and the International Space Station Program will take the next few days to review the data and procedures to make a final determination before proceeding to flight countdown."Due to the delay, the astronauts returned to Houston to spend time with their families. If the issue is resolved, they will return to Kennedy Space Center about a week before the next launch date.