Several days after a Boeing 737 MAX flown by Lion Air plunged into the sea off Java, Indonesia, family members of those killed scattered flowers on the water, their faces contorted in grief. Some wept quietly.

Five months later, mourners gathered in Addis Ababa, the Ethiopian capital, for a memorial service after a Boeing MAX flown by Ethiopian Airlines slammed into the ground at about 885 kilometers per hour shortly after takeoff.

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