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His fuel tank and nozzle are used to refill planes and, on one occasion, Mayday the fire truck. He is good friends with Dottie and Sparky. He is also a friend and fan of Dusty Crophopper.
During Dusty's training, he also strikes up a friendship with Sparky, who is revealed to have the same kind of humor as he is alive to any kind of idea concerning merchandise for Dusty, even setting up a website together.
"Fuel truck Chug is a guy's guy. He works hard as co-owner of Chug and Dottie's Fill 'n Fly service station—and plays hard indulging in his own fuel from time to time. He has a big personality and is a bold supporter of Dusty's high-flying endeavors. Indeed, he's not only Dusty's buddy, he's his coach and biggest fan. And if Chug can't help Dusty reach new heights, he'll find someone who can."
For this subject's image gallery, see Chug/Gallery.
He is inspired by Bob Leaders' disused fuel truck that was found in a grove of evergreen trees when the filmmakers traveled to Leaders Clear Lake Airport in Minnesota while touring regional airports in the Midwest for inspiration for their Propwash Junction setting.
Chug appears to be some old late 1940s Chevrolet truck judging by the shape of his grille.