United has received its 1,000th mainline jet, claiming the title of the world’s largest mainline fleet. The aircraft ‒ a 737 MAX 9 with registration N77584 ‒ was delivered by Boeing on Monday.

With this latest delivery, the Chicago-based carrier not only has 1,000 aircraft in its mainline fleet but also has the most airplanes of any airline globally. Data from aviation analytics company Cirium shows that United took delivery of 57 total aircraft last year. //

The airline now trumps the mainline fleets of both Delta and American, which were the previous titleholders. According to planespotters.net data, Delta has 985 aircraft, while American has 978.