What is the plot problem in FLYING by Reeve Lindbergh?

Reeve Lindbergh is the youngest child of world renowned Charles Lindbergh, the famous aviator who was first to fly over the Atlantic Ocean. The story discusses how Charles Lindbergh taught his children to fly on Saturday afternoons. They rented an Aeronica with room for two and he and each of his children would fly as he gave each a lesson. Reeve describes an event when the plane began to stall and Charles brought it in for a safe landing as "he was being the airplane".