If Boeing Needs Uncrewed Success for a Crewed Flight One Year After SpaceX

The Boeing Starliner crew capsule will fly a second time without astronauts after software problems and other issues caused the first test flight on 20 December 2019 to fail to reach the International Space Station. If the November, 2020 uncrewed Starliner flight is successful then there would be a first crewed flight around April 2021.

Boeing is building the core stage of the super heavy Space Launch System (SLS). SLS is years behind schedule. The first flight of SLS has slipped multiple times and now is targeting a launch date of November 2021.

SOURCES- Wikipedia