On a day when thousands mourned the 157 victims of last Sunday’s Ethiopian Airlines crash, Transport Minister Dagmawit Moges said “clear similarities’’ were found between that accident and a fatal Lion Air crash Oct. 29, 2018, in Indonesia. Both doomed flights involved the new Boeing 737 MAX 8 aircraft, putting the onus on the American manufacturer to find the source of the catastrophic failure of its now-grounded plane.