Chicago: M.A. Donohue & Company, (ca 1930, c 1912). Hardcover - The fourth and final book in this series featuring the adventures of "girl aviators" Peggy, Jess and Bess, and their brothers Roy and Jimsy - in this, they set off in a group of four planes to North Carolina. "The delicacy of flight suggested by the word 'butterfly,' the mechanical power implied by 'motor,' the ability to control assured by the title 'aviator,' all combined with the personality and enthusiasm of girls themselves, make this story one for any girl or other reader 'to go crazy over.'" (publisher's ad) Illustrated with a glossy frontispiece and three internal plain paper plates by Charles Wrenn. 307 pp plus 7 pp publisher's ad.