The largest airlines in the world can be measured in several ways. As of 2026, United Airlines was the largest in terms of available seat miles, revenue seat miles, mainline fleet size, the number of
Delta Air Lines ranks first by revenue, net income, total assets, market capitalization and brand value.
United Airlines ranks first in ASM, RPM, fleet size and number of both destinations and employees.
American Airlines Group ranks first by number of passengers carried.
FedEx Express is the largest by freight tonne-kilometers.
International Airlines Group
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International Consolidated Airlines Group S.A., trading as International Airlines Group and usually shortened to IAG, is a British-Spanish multinational airline holding company with its registered off
Largest airlines in the world
…Delta Air Lines United States 63.3 2 United Airlines United States 59.0 3 American Airlines Group United States 54.6 4 Lufthansa Group Germany 45.7 5 International Airlines Group United Kingdom / Spain 38.3 6 Air France–KLM France / Netherlands 35.5 7 Southwest Airlines United States 28.0 8 China Southern Airlines China 24.4 9…
International Airlines Group's Airlines
Iberia and British Airways aircraft tails, early 2010s
Vueling Airbus A320-200
Aer Lingus Airbus A330-200