Moving on into the 4th month of grounding now, it's notable there is no positive, straightforward announcement of what is going on. You would expect statements about things being tested from both sides, etc. But nothing. One can only presume there is some deep, unacceptable issue that the parties just cannot agree on.
Regarding announcements about service re-entry, Boeing's various statements about dates which have subsequently proved not to be achieved, and to have had no foundation, must surely now come to the attention of the Securities & Exchange Commission for any impact on their share price. Do many expect it back before 2020 now ?