In this fifth book of the Airplane Boys, Jim and Bob risk their lives to help a worthy family out of their difficulties.

Originally published in 1931.

In this third book about the Airplane Boys, they get a marvelous new plane, which they name the "Lark" and which takes them to new adventures and serves them to good purpose in many a narrow escape.

The Airplane Boys accidentally bump into a new mystery which is only solved after many pages of excitement in this seventh book of air adventures.

Originally published 1930.

This is the first book of the Sky Buddies, Jim Austin and Bob Caldwell and their plane, properly christened "HER HIGHNESS" in which they encounter many thrilling and exciting adventures.

In this fifth book of the Airplane Boys, Jim and Bob risk their lives to help a worthy family out of their difficulties.

Originally published in 1931.

In this third book about the Airplane Boys, they get a marvelous new plane, which they name the "Lark" and which takes them to new adventures and serves them to good purpose in many a narrow escape.

The Airplane Boys accidentally bump into a new mystery which is only solved after many pages of excitement in this seventh book of air adventures.

Originally published 1930.

This is the first book of the Sky Buddies, Jim Austin and Bob Caldwell and their plane, properly christened "HER HIGHNESS" in which they encounter many thrilling and exciting adventures.