. . . . . . . . "Juvenile works" . "How do airplanes fly? : a book about airplanes" . . . "Covers the history of flight, from Leonardo da Vinci to modern jumbo jets." . "History" . . . . . . "A simple introduction to the history of flying machines and the process by which propellers and jet engines allow planes to fly." . . . "How do airplanes fly?" . .