Delta Air Lines, Inc. ( ) is a United States airline . Delta operates an expansive domestic and international network, spanning North America, South America, Europe, Asia, Africa, the Middle East and the Caribbean. Delta flies to over 332 destinations in 57 countries (excluding codeshare), across 5 continents. Delta is the only major U.S. carrier that flies to Africa.

Delta operates hubs at Hartsfield-Jackson Atlanta International Airport, Salt Lake City International Airport, Cincinnati/Northern Kentucky International Airport, and New York's John F. Kennedy International Airport; Delta's Atlanta hub is the largest/busiest airline hub in the world. Delta also has large operations in many other cities, including Boston, Cancun, Fort Lauderdale, Los Angeles, New York-LaGuardia, Orlando, Tampa, and Columbus. Delta is the leading carrier in Florida, and carries more passengers across the Atlantic than any other carrier worldwide. Its major transatlantic gateways are Atlanta, Cincinnati, and New York-JFK. Transatlantic service is scheduled to start in 2008 from Salt Lake City to Paris. Its major Latin American gateways are Atlanta and its rapidly developing hub in Los Angeles.

In terms of passengers carried (approximately 119 million in 2005), Delta is the second-largest airline in the world (behind American Airlines). In terms of revenue passenger miles, Delta Air Lines is the third largest airline, after American Airlines and United Airlines. Delta Air Lines serves more destinations than any other airline in the world. In terms of total operating revenues, Delta is the sixth-largest airline in the world.