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 revenue during a fiscal year, grouped accordingly as "Group III". Airlines According to FY2020 revenues, there were 18 major carriers who meet the requirement for Group III status. Mainline passenger Alaska Airlines Allegiant Air American Airlines* Delta Air Lines* Frontier Airlines Hawaiian Airlines JetBlue Southwest Airlines* Spirit Airlines United Airlines* (*) - considered as one of the "Big 4" major U.S. national airlines Regional passenger Envoy Air (subsidiary of American Airlines Group) Republic Airways SkyWest Airlines Freight Atlas Air FedEx Express Kalitta Air Polar Air Cargo (subsidiary of Atlas Air Worldwide Holdings) UPS Airlines See also Largest airlines in the world List of largest airlines in North America List of airlines of the United States Legacy carrier References Civil aviation in the United States United States Department of Transportation