It is one of the most enduring mysteries of the past century: What happened to Amelia Earhart, the daring young aviator who disappeared with her navigator, Fred Noonan, on July 2, 1937 as they attempted to fly around the world? They last radioed that they were about 100 miles from Howland Island, which is a tiny atoll southwest of Hawaii. Many expeditions to find the bodies, the plane, or even the slightest clues have proven fruitless. Saint John Naftel says he knows the answer. Naftel is an 81-year-old World War II veteran from Alabama, who says he has identified a...