HartsfieldJackson Atlanta International Airport (ATL) is the busiest airport in the United States, home to Delta Air Lines and its largest catering facility in North America. Headquartered in Atlanta, Georgia, Delta Air Lines is the world’s largest airline by revenue and one of the world’s oldest airlines. The SkyTeam airline alliance founder and its subsidiaries operate over 5,400 flights daily. Delta Air Lines has nine hubs in the United States, of which HartsfieldJackson Atlanta International Airport (ATL) is the largest.