After two fatal crashes in five months involving its best-selling 737 Max jet, Boeing Co. sent a team to reassure airline bosses of its focus on safety at their annual gathering in Seoul. They faced a tough crowd.

The International Air Transport Association event began Sunday with an opening ceremony in which sobering news reports on the disasters were beamed onto super-sized screens as the industry group's head, Alexandre de Juniac, warned that the plane-approval process is damaged and the industry is under scrutiny.

Doubts about a speedy resolution to the Max crisis left a shadow over the two-day meeting, aviation's biggest gathering since the second crash in Ethiopia in March and a key annual forum for top-level discussions.