As of January 2025[update], the United Airlines fleet consists of 994 mainline aircraft, making it the largest commercial airline in the world.[1][2] United Airlines operates a mix of Airbus and Boeing narrow-body and all Boeing wide-body aircraft. Additionally, United operates more widebody aircraft than any other U.S. carrier.[3]
With an average age of 19.4 years, United has the oldest fleet of all major US airlines. Their oldest planes are the Boeing 767-300ER from the early 1990s, which are around 33 years old.[4] However, United in 2022 and 2023 placed orders for over 700 new narrow-body and wide-body aircraft expected to be delivered by 2033.