What contribution is William B. Hartsfield known for in Atlanta?

William B. Hartsfield is primarily known for his significant contributions to the development of aviation in Atlanta, particularly through the establishment of the city's first airport. Under his leadership as mayor during various terms in the mid-20th century, Hartsfield was instrumental in transforming the airport into a major hub that would eventually become the busiest airport in the world, Hartsfield-Jackson Atlanta International Airport. His vision for an effective transportation system not only bolstered the local economy but also positioned Atlanta as a pivotal center for air travel in the southeastern United States. This legacy continues to influence the city's growth and connectivity on both a national and international scale.