This week we visit Kentucky! U.S. aviation—both civil and military— progressed after World War I thanks to the airmail industry. This sector developed new aircraft, increasingly sophisticated means of navigation, and the economic model necessary to advance flight in those pioneer years. Bowman Field of Louisville, Kentucky was a key airmail hub and later served as an important base in World War II. On the space front, we highlight space leaders from the Blue Grass State like Chief of Space Operations General Chance Saltzman as well as G. Scott Hubbard, known as the “Mars Czar” within NASA, and astronaut legend Story Musgrave.