NTSB Chair Jennifer Homendy provided an update into the investigation of the Sunday crash of an Air Canada plane and a Port Authority fire truck that left both pilots dead. Addressing reports that air traffic controllers were distracted, Homendy said, “We rarely, if ever, investigate a major accident where it was one failure. Our aviation system is incredibly safe because there are multiple layers of defence built in to prevent an accident. So when something goes wrong, that means many, many things went wrong.”