Alaska Airlines 737-900 MAX loses a door in-flight out of PDX

[DIBO]

I think it gives a pretty good indication on where, how and what they were up to, given the roof-top mounted wifi dome was part of their mission. And at first sight, that does not include any plug door activity.
So that is why I included in my original post

I think, for now, better not call the NTSB...