Leading airlines in the U.S. by domestic market share 2021

The statistic represents the U.S. domestic market share of leading airlines from January to December 2021. During this time period, American Airlines was the leading airline in the U.S., with a domestic market share of 19.5 percent, closely followed by Southwest Airlines, which had a 17.4 percent market share.

U.S. airlines' domestic market share

The passenger air transportation market is a thriving industry, taking individuals to locations around the globe. American Airlines was the second largest airline in the world based on sales, reaching 44.9 billion U.S. dollars in sales revenue in 2019. Passenger airlines can face much scrutiny for their passenger satisfaction and comfort. A 2019 North American Airline Satisfaction Study by J.D. Power & Associates listed low-cost airlines and JetBlue Airways as the best long-haul and short-haul carriers.

United Airlines, Delta Air Lines, American Airlines and Southwest Airlines are the top ranked airlines based on 2020 domestic market share. Delta operates out of Atlanta, and Hartsfield-Jackson Atlanta International Airport, Delta’s hub, sees the most passenger traffic in the United States. At 330.58 billion, American Airlines boasted the most passenger kilometers flown in 2018. Chicago-headquartered United Airlines is a subsidiary of United Continental Holdings. United has flights to 238 domestic destinations and 60 different countries, the George Bush Intercontinental Airport in Houston being its largest passenger hub with over 40 million passengers every year.