American explorer Lincoln Ellsworth (1880 - 1951, left) with the flags of the USA, the National Geographic Society, Yale University, the Quiet Birdmen aviation club and the New York Athletic Club, November 1935. Ellsworth intended to take the flags on his third attempt at a transantarctic flight with co-pilot Herbert Hollick-Kenyon (right) in their specially-built,all-metal, Northrop monoplane the Polar Star. The pair took off on 23rd November 1935, almost immediately lost the use of their radio and were feared lost. They were, however, rescued in January 1936. (Photo by New York Times Co./Hulton Archive/Getty Images)