In 2025, Delta Air Lines and United Airlines were the leading airlines in the U.S., with a domestic market share of and percent respectivelly. That year, American Airlines had the second-largest market share of percent.
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 third largest airline in the North America based on operating revenue, reaching nearly billion U.S. dollars in 2025. Passenger airlines can face much scrutiny for their passenger satisfaction and comfort. A 2025 North American Airline Satisfaction Study by J.D. Power & Associates listed Southwest Airlines as the best long-haul, closely followed by low-cost carrier JetBlue Airways.
Delta Airlines, American Air Lines, Southwest Airlines and United Airlines are the top-ranked airlines based on 2025 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. Chicago-headquartered United Airlines is a subsidiary of United Continental Holdings. United has flights to domestic destinations and destinations internationally.
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