PLANES WITHOUT PILOTS: “Mounting evidence that the co-pilot crashed a Germanwings plane into a French mountain has prompted a global debate about how to better screen crewmembers for mental illness and how to ensure that no one is left alone in the cockpit. But among many aviation experts, the discussion has taken a different turn. How many human pilots, some wonder, are really necessary aboard commercial planes? One? None?” Maybe we should go the other direction, and bring back flight engineers.