Katherine Stinson and Biplane before Transcontinental Flight, "It's a Long, Long Way To 'Frisco," 1912

Petite Katherine Stinson looked younger than her 21 years when she earned her pilot's license in 1912. The press dubbed her the "Flying Schoolgirl." But Stinson was among the best exhibition flyers of the pre-World War I era. The "tractor" mentioned in the caption is her airplane. Planes with propellers in front of their engines are called tractors, as opposed to rear-propeller pushers.