Delta Air Lines, Inc. is a major airline

Major carrier

Major carrier or major airline carrier is a designation given by the United States Department of Transportation to U.S.-based airlines that post more than $1 billion in revenue during a fiscal year.As of 2010, there were 19 major carriers....

 based in the United States and headquartered in Atlanta, Georgia. The airline operates an extensive domestic and international network serving all continents except Antarctica. Delta and its subsidiaries operate over 4,000 flights every day. The airline's hub

Airline hub

An airline hub is an airport that an airline uses as a transfer point to get passengers to their intended destination. It is part of a hub and spoke model, where travelers moving between airports not served by direct flights change planes en route to their destinations...

 at Hartsfield-Jackson Atlanta International Airport

Hartsfield-Jackson Atlanta International Airport

Hartsfield–Jackson Atlanta International Airport , known locally as Atlanta Airport, Hartsfield Airport, and Hartsfield–Jackson, is located seven miles south of the central business district of Atlanta, Georgia, United States...

 is the world's largest, and since 1999 the world's busiest airport by passenger traffic (88 million passengers per year) and number of landings and take-offs.