March is Women’s History Month. Throughout the decades, women’s achievements have enriched the history of the Postal Service.

Kathrine Stinson, the “Flying Schoolgirl,” helped the Postal Service expand its delivery network into aviation. At age 21, Stinson was the fourth woman in the U.S. to earn her pilot’s license. When she dropped mailbags from her plane at the Montana State Fair in 1913, she became the first woman pilot to deliver mail by air.

Four years later, Stinson set a non-stop, long-distance endurance record by flying from San Diego to San Francisco in 9 hours, 10 minutes. She became the first woman to fly an experimental mail route from Chicago to New York in 1918.

Stinson also was the first woman to fly the regular route from New York to Washington, DC.