The first Space Launch System flight will probably be delayed

It's looking likely that the first flight of NASA's new heavy lift rocket, the Space Launch System, will slip beyond its November 2018 launch date. The space agency has yet to announce any official schedule changes. But a recent report by NASA's Office of Inspector General, along with dates provided by internal sources, an agency-wide schedule review currently in progress, and welding challenges involving the core stage liquid oxygen tank, all point to a probable delay. More

(Source: The Planetary Society - Apr 27)