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Chicago-based United Airlines is among the largest carriers in the United States, boasting a fleet of over 1,000 aircraft. It operates an extensive domestic network and continues to expand internationally. As a founding member of the Star Alliance, United collaborates with approximately 25 airlines, facilitating over 19,000 daily flights across 1,300 global airports.
United's fleet comprises both Airbus and Boeing aircraft. The airline has more widebody planes than any other major U.S. carrier. The average age of its fleet is 15.6 years. Narrowbody operations are supported by Airbus A319-100, A320-200, and A321neo models alongside several Boeing variants like the 737 MAX series.
The airline's most popular route in 2025 is between Chicago O'Hare International Airport (ORD) and New York LaGuardia Airport (LGA), operating an average of 13 flights per day according to Cirium data. This service offers around 2,100 seats daily over a distance of 733 miles.
