1940 - Superman Radio Show
If radio is the "theater of the mind", then the original voice of Superman truly made so many believe a man could fly. And Bud Collyer did it largely with just the sound of his voice. Special sound effects of the time gave Superman's adventures a lush soundtrack to play out against, so whether Clark Kent was getting the scoop aboard a small plane caught in a storm or struggling to catch a collapsing roof at the last moment as the "Man of Tomorrow", his escapades on the radio were accompanied by a vivid auditory landscape for countless imaginations to play upon. But it was Collyer who brought the man to life in Superman, not only making the two alter egos differing characters, but also giving Clark and Kal-El two separate, distinct voices, by dropping the bass in the higher-pitched Kent when he declares, "this looks like a job for Superman!".
Superman's flight was adapted for radio, it's first time in audio, with a sharp whistling sound when he leapt from Earth. This bomb-drop-like noise sometimes was so loud it made for difficult understanding of Superman's lines or dialogue over it, but nevertheless it worked. It gave the immediate impression of being airborne and was a sound adapted again and again for future flights in other media.