> This is the correct move. Airline crashes are so rare that two crashes of a new model within 6 months of each other must be cause for grounding flights.

I agree. It seemed like the FAA was taking a position best described as "innocent until proven guilty." I think that's great for the US criminal justice system. I think a better approach for air travel safety is "abundance of caution." I have no direct experience in this field but it seems to me that the plane should be grounded out of an abundance of caution until we know more.

Edit: FWIW I used the phrase "abundance of caution" before I read it in the article.