Delta Air Lines, Inc. (IATA: DL, ICAO: DAL, Callsign: DELTA) (NYSE: DAL) is a United States airline based and headquartered in Atlanta, Georgia. Delta operates an extensive domestic and international network, spanning North America, South America, Europe, Asia, Africa, the Middle East, the Caribbean, and Australia. Delta began service to Sydney, Australia in July 2009, which made it the only current American carrier to serve every continent except Antarctica. Delta and its subsidiaries fly to over 375 destinations in 88 countries (excluding codeshare), across 6 continents. Delta is the only major U.S. carrier that flies to Africa and operates the two longest non-stop routes of all U.S. carriers from Atlanta to Mumbai and from Atlanta to Johannesburg on the Boeing 777-200LR.
Delta operates its largest hub at Hartsfield-Jackson Atlanta International Airport and also maintains hubs at Cincinnati/Northern Kentucky International Airport, John F. Kennedy International Airport in New York City and Salt Lake City International Airport. Delta's Atlanta hub is the busiest airline hub in the world.
On October 29, 2008, Delta completed its merger with Northwest Airlines to form the world's largest commercial carrier. In February 2009, the airline began consolidating gates and ticket counters at airports where both Delta and Northwest operate. The consolidation will be completed by early 2010. Delta carries more passengers across the Atlantic than any other carrier worldwide.