United Launch Alliance delays the first crewed Boeing Starliner launch TESLARATIBoeing’s historic Starliner mission now expected to launch no sooner than May 17 after valve issue CNNBoeing's Starliner rolled off launch pad to replace 'buzzing' rocket valve (photo) Space.comElon Musk bashes historic Boeing astronaut flight, SpaceX did it first Business InsiderBoeing's first astronaut launch is off until late next week to replace a bad rocket valve The Associated Press