Major airlines of the United States
The "Big 4" U.S. airlines. Clockwise from top left: American Airlines, Delta Air Lines, United Airlines, and Southwest Airlines[1]
The United States Department of Transportation defines a major carrier or major airline carrier as a U.S.-based airline that posts more than $1 billion in operating revenue during a fiscal year, grouped accordingly as "Group III".[2]
Airlines
The Bureau of Transportation Statistics updates the listing of major airlines once per year.[2] According to FY2025 operating revenues, 19 carriers meet the requirement for Group III status:[3][a]
Mainline passenger
- Alaska Airlines(subsidiary of Alaska Air Group)
- Allegiant Air(subsidiary of Allegiant Travel Company)
- American Airlines[b](subsidiary of American Airlines Group)
- Delta Air Lines[b]
- Frontier Airlines
- Hawaiian Airlines(subsidiary of Alaska Air Group)
- JetBlue
- Southwest Airlines[b]
- Sun Country Airlines(subsidiary of Allegiant Travel Company)
- United Airlines[b]
Regional passenger
- Envoy Air(subsidiary of American Airlines Group)
- PSA Airlines(subsidiary of American Airlines Group)
- Republic Airways
- SkyWest Airlines