We won't get our first real idea as to what caused Sunday's crash until the plane's black box is analyzed.
But airlines shouldn't wait until then to ground their fleets of Boeing 737 MAX 8 aircraft, according to Mary Schiavo, a CNN aviation analyst and the former Inspector General of the U.S. Transportation Department.
"Absolutely, everybody should" ground the jets, Schiavo told CNN Monday. "I think Boeing should take the lead -- Boeing should do it," she added.
The MAX 8 jet, unveiled just two years ago, has been involved in two crashes in less than six months, following October's Lion Air disaster which killed all 189 people on board.
The 737 MAX series is Boeing's fastest-selling jet; Southwest, United and American Airlines have all ordered 100 or more of the series, according to Boeing's most recent figures, with each airline already operating several MAX 8s.