Concerns by operators over splits between different national regulators.
https://www.bbc.co.uk/news/business-48489082
It would seem if this has been "leaked", that the recent meeting of regulators over the issue was not conclusive.
If only Dennis Muilenburg was not so obviously beholden principally to Wall Street, leavened only by periodic "our first concern" statements which have all the hallmarks of being written by the legal and
PR teams, along with what seem to be somewhat inappropriate and "pushy" statements about the FAA. Come on, Boeing board, we can all see it.