Sparky the Firefly (1953)

A Terrytoon that runs a couple of minutes longer than the average finds Sparky a firefly who loses is light and is ostracized by his own kind His friend the bookworm advises him to replace his light with a flashlight bulb His light is even more powerful than ever but his fellow fireflies now consider him a freak But ol Sparky saves the day when he acts as the guiding light at an airport