Enlarge / Boeing's Starliner spacecraft atop its Atlas V rocket on the launch pad earlier this month. (credit: NASA/Joel Kowsky) Senior managers from NASA and Boeing told reporters on Friday that they plan to launch the first crew test flight of the Starliner spacecraft as soon as June 1, following several weeks of detailed analysis of a helium leak and a "design vulnerability" with the ship's propulsion system. Extensive data reviews over the last two-and-a-half weeks settled on a likely cause of the leak, which officials described as small and stable.