Simple Flying
Which US Carrier Operates The Most Aircraft Types In Its Mainline Fleet In 2026?
xCruzo Brief
As of October 2026, United Airlines has the largest mainline fleet among the three largest US legacy carriers, with 1,147 aircraft, followed by American Airlines at 1,037 and Delta Air Lines at 1,006. The fleets differ sharply in mix, not just size. American currently runs the most streamlined mainline roster, with four aircraft families: Airbus A320, Boeing 737, 777 and 787. Delta has the widest variety with eight types, while United sits in between with six. Variant counts also diverge: American has 11, Delta 17, and United 20. United operates more 737, 777 and 787 variants, while Delta lacks 777 and 787—and doesn’t fly the 737 MAX.
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