According to Hartsfield-Jackson’s own factsheet, their airport has a direct economic impact of more than about $32.5 billion for the metro Atlanta area economy annually, and there are over 58,000 airline, ground transportation, concessionaire, security, federal government, City of Atlanta and Airport tenant employees. On average, there are almost 2,500 arrivals and departures daily, or on average, 912,500 flights annually.
http://www.atlanta-airport.com/Airport/ATL/ATL_Factsheet.aspx
That comes up to for each individual employee, they bring an average of $560,344 each to the economy.