Floca (The Frightful Story of Harry Walfish, 1997, etc.) offers a great explication of the small trucks that airline passengers see scurrying around jets on the runways. In brightly painted illustrations and simple descriptions, he introduces each vehicle, explains what it does, and shows it in action, e.g., the truck called the baggage conveyor is shown hoisting suitcases into the belly of the plane. All five trucks’ duties point to a big finale when the plane takes off. Given preschoolers’ well-documented fascination with heavy machinery, this book will strike a chord with young air travelers, and answer the questions of older travelers as well. (Picture book. 6-10)