Ruth Plumly Thompson 
Ozoplaning with the Wizard of Oz 

Ozoplaning with the Wizard of Oz (1939) is the thirty-third in the series of Oz books created by L. Frank Baum and his successors, and the nineteenth and last written by Ruth Plumly Thompson. It was illustrated by John R. Neill. The story opens with a dinner party, attended by seven of the characters from Baum’s inaugural book, including the castle-housemaid Jellia Jam. After the dinner, the Wizard takes his guests to a glass-domed building that contains two gleaming silver aircraft, the newly created ozoplanes.