"Ozoplaning with the Wizard of Oz" by Ruth Plumly Thompson is a novel published in 1939. When the Wizard's experimental aircraft accidentally launch, carrying his dinner guests to unexplored sky-countries, adventure erupts. The Tin Woodman's diplomatic blunder sparks an invasion plot against Oz, while the Wizard and Dorothy must navigate treacherous aerial realms, confronting bizarre creatures and villainous rulers. With Ozma's kingdom under threat and their friends held hostage, the heroes race to harness Glinda's magic before conquest becomes reality. (This is an automatically generated summary.)