What pioneer aviators helped make airmail possible?

Pioneer aviators such as Charles Lindbergh, who completed the first solo nonstop transatlantic flight, and Walter Varney, who established the first scheduled airmail service in the United States, played crucial roles in making airmail possible. Additionally, pilots like Richard Byrd and airmail advocates such as William S. Hinton contributed to the development and promotion of airmail routes. Their innovations and daring flights demonstrated the viability of air travel for mail delivery, paving the way for the expansion of airmail services globally.