The first successful construction that was built in any number (141 aircraft) was the Vega first built in 1927, best known for its several first- and record-setting flights by, among others, Amelia Earhart, Wiley Post, and George Hubert Wilkins. In the 1930s, Lockheed spent $139,400 ($) to develop the Model 10 Electra, a small twin-engined transport. The company sold 40 in the first year of production. Amelia Earhart and her navigator, Fred Noonan, flew it in their failed attempt to circumnavigate the world in 1937. Subsequent designs, the Lockheed Model 12 Electra Junior and the Lockheed Model 14 Super Electra expanded their market.