With decades of aircraft evolution, we can now look back at several features that were once considered important for safe flight operations but gradually faded away as technology advanced. Aircraft wings have seen several changes and engines have become far more powerful with better fuel economics. The material with which the fuselage is built has also become lighter and stronger, and the cockpit, too, has become highly automated over the decades. Among the things that are now no longer present on an aircraft are eyebrow windows. There was a time when these could be seen on some Boeing planes –...