https://phys.org/news/2019-03-grounding-boeing-touchy-subject-authorities.html > American officials face a difficult task in reassuring the flying public, as passengers take to social media, saying they are afraid to board a 737. > The Federal Aviation Administration said it has a team on-site working with investigators on the cause of the crash, and pledged to take "immediate" action if it finds any issues with the aircraft.