The largest airlines in the world can be defined in several ways. , Delta Air Lines is the largest by revenue, assets value and market capitalization, China Southern Air Holding by passengers carried, American Airlines Group by revenue passenger mile, fleet size and number of employees, FedEx Express by freight tonne-kilometers, Ryanair by number of routes, Turkish Airlines by number of countries served and UPS Airlines by number of destinations served. By company revenue Note that Emirates is a state-owned company and is thus not included in this list of public companies. Its 2021 revenue was estimated over 18 billion USD, which would place the company into 5th place. Its 2014-2015 revenue was billion ( billion), profit billion ( billion), and assets billion ( billion), with 56,725 employees. Qatar Airways Group is similarly privately held. By passengers carried Airline groups Airlines The IATA reports numbers for individual air operator's certificates and groups of multiple airlines can report larger numbers. By scheduled passenger-kilometers flown (millions) ‡ - marks a defunct airline. By scheduled freight tonne-kilometers (millions) By fleet size Aircraft Aircraft capacity By number of countries served By number of routes By number of destinations By brand value See also Flag carrier List of largest airlines in North America List of largest airlines in Europe List of largest airlines in Central America and the Caribbean List of largest airlines in Africa List of largest airlines in Asia List of largest airlines in South America List of largest airlines in Oceania List of airline holding companies List of the busiest airports in Africa List of the busiest airports in Asia List of the busiest airports in Europe List of the busiest airports in Latin America List of the busiest airports List of busiest airports by passenger traffic List of busiest airports by aircraft movements List of busiest passenger air routes References