Roughly two-thirds of the Boeing 737 Max 8 aircraft in the world have been pulled from use by airlines and aviation regulators after the deadly crash of a 737 MAX passenger plane in Ethiopia on Sunday. The swift actions by authorities around the world were driven in part by concerns about a connection to a similar disaster involving a Max 8 in Indonesia last October, when a Lion Air flight plunged into the Java Sea shortly after takeoff, killing all 189 people aboard. The cause of Sunday's crash, which followed another disaster with a 737 MAX five months ago in