Atlas 5 valve repair will delay Starliner’s first crewed mission to May 17 at the earliest

Boeing’s Starliner spacecraft is going to have a wait a bit longer before its first astronaut mission can take place. Following the decision to scrub the Crew Flight Test mission about two hours prior to liftoff, teams with United Launch Alliance (ULA), Boeing and NASA concluded that more work was needed to prepare the Atlas 5 to launch. In order to do that, the rocket will need to be rolled back to the Vertical Integration Facility (VIF) at Space Launch Complex 41. The anticipated timeline for the work will push the launch back to no earlier than May 17, according to NASA. The new liftoff time is now 6:16 p.m. EDT (2016 UTC). More

(Source: SpaceFlight Now - May 8)