Amelia Earhart
Planning

Early in 1936, Earhart started planning to fly around the world; if she succeeded, she would become the first woman to do so. Although others had flown around the world, Earhart's flight would be the longest at 29,000 miles (47,000 km) because it followed a roughly equatorial route. Earhart planned to court publicity along the route to increase interest in a planned book about the expedition.

Purdue University established the Amelia Earhart Fund for Aeronautical Research and gave $50,000 to fund the purchase of a Lockheed Electra 10E airplane. In July 1936, Lockheed Aircraft Company built the airplane, which was fitted with extra fuel tanks and other extensive modifications. Earhart dubbed the twin-engine monoplane her "flying laboratory". The plane was built at Lockheed's plant in Burbank, California, and after delivery, it was hangared at the nearby Mantz's United Air Services.

Earhart chose Harry Manning as her navigator; he had been the captain of the President Roosevelt, the ship that had transported Earhart from Europe in 1928. Manning was also a pilot and a skilled radio operator who knew Morse code.

The original plan was a two-person crew: Earhart would fly and Manning would navigate. During a flight across the US that included Earhart, Manning, and Putnam, Earhart flew using landmarks; she and Putnam knew where they were. Manning did a navigation fix that alarmed Putnam, because Manning made a minor navigational error that put them in the wrong state; they were flying close to the state line, but Putnam was still concerned. Sometime later, Putnam and Mantz arranged a night flight to test Manning's navigational skill. Under poor navigational conditions, Manning's position was off by 20 miles (32 km). Elgen M. and Marie K. Long considered Manning's performance reasonable, because it was within an acceptable error of 30 miles (48 km), but Mantz and Putnam wanted a better navigator.

Through contacts in the Los Angeles aviation community, Fred Noonan was chosen as a second navigator, because there were significant additional factors that had to be dealt with while using celestial navigation for aircraft. Noonan, a licensed ship's captain, was experienced in both marine and flight navigation; he had recently left Pan American World Airways (Pan Am), where he established most of the company's China Clipper seaplane routes across the Pacific. Noonan had also been responsible for training Pan American's navigators to fly the route between San Francisco and Manila. Under the original plans, Noonan would navigate from Hawaii to Howland Island—a difficult portion of the flight—then Manning would continue with Earhart to Australia, and she would proceed on her own for the remainder of the project.
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