Airlines are companies that provide air transportation services for passengers and freight. The majority of airlines are used for transporting passengers and important goods. The number of airlines’ fleets is determined by passenger demand, and because the United States is the largest and richest country, most civilians and travelers connect places via planes, so the top four largest airlines are from the United States: Delta Airlines, SkyWest, Southwest Airlines, and United Airlines. The largest airlines listed below are based on their total airline fleet size.
The list of the top ten largest airlines is based on the total fleet held by the airline company, and it includes information such as the number of fleet, new orders, opening dates, and head quarters.
| Rank | Name of the Airlines | No. of Fleet | New Order | Founded | Head Quarters |
| 1 | Delta Airlines | 744 | 121 | 1929 | Atlanta, Georgia, USA |
| 2 | SkyWest | 727 | 74 | 2005 | St. George, Utah, USA |
| 3 | Southwest Airlines | 710 | 403 | 1967 | Guangzhou, Guangdong, China |
| 4 | United Airlines | 703 | 340 | 1926 | Chicago, Illinois, USA |
| 5 | Lufthansa | 635 | 155 | 1953 | Cologne, Germany |
| 6 | American Airlines | 611 | 410 | 1930 | Fort Worth, Texas, USA |
| 7 | Air France-KLM | 616 | 80 | 1933, 1919 | Roissypole, Paris-Charles de Gaulle Airport Tremblay-en-France, France |
| 8 | International Airlines Group | 435 | 134 | 2011 | London, United Kingdom |
| 9 | Air Canada | 362 | 37 | 1936 | Montreal, Quebec, Canada |
| 10 | China Southern Airlines | 362 | 13 | 1981 | Guangzhou, Guangdong, China |
Note: Above is a list of the largest airlines based on the total number of Fleet owned by the Airline Companies.
