There are some storm clouds for some 737 MAXs in the future -- Certain versions of the MAX flight certifications expires at the end of the year
FAA says Boeing has not completed work needed for 737 MAX 7 approval
U.S. Senate defense bill does not extend Boeing 737 MAX certification -sources
Seems to be just an issue with 737 MAX 7 ( and MAX 10) certification, so UA's MAX 8s and MAX 9s will / may not be impacted but expect more MAX news / confusion in the future