International airlines are preparing to inspect their Boeing fleets after a preliminary investigation into last month’s fatal Air India crash identified flaws linked to the plane’s fuel cutoff switche...

Boeing’s engine fuel control switches, now the center of the investigation into the fatal Air India crash in June, have been scrutinized before.

A preliminary report into the Air India crash that killed 260 people in the northwestern city of Ahmedabad found that the switches shifted positions within one second, cutting off fuel supply to both...