Some of the most important parts in a vehicle are often overlooked and taken for granted. A good example is the side door latch, which has a spring-loaded mechanism that retracts to open the door and, upon release of the door handle, protrudes to keep the door closed.

It is rare for CEOs of competing airlines to be passengers on the same flight. But, that’s exactly what happened June 3, 2016, on SWISS Airlines’ flight BBA505, from Dublin to Zurich.