In a vast postal airport, the employees are busy all day long, yet filled with joy. They sort mail, pack it uniformly, and have specialized pilots deliver it to all corners of the world. Mickey Mouse is one of the many postal pilots, and he is busy tuning up his beloved plane, all while taking a moment to kiss a photo of his dearest girlfriend, Minnie. Just then, a fully armored truck arrives at the airport, carrying a large sum of cash that needs to be transported by plane to another location. Mickey is assigned this tough and dangerous mission, as he will encounter the notorious postal thief along the way. However, Mickey is full of confidence, undeterred by the danger, and bravely takes to the skies in his plane. 　　During the flight, he encounters fierce storms, lightning and thunder, freezing snow and ice, and, inevitably, engages in a thrilling showdown with the postal thief...