United Airlines and American Airlines are the primary operators of the Boeing 777-300ER among US carriers, both maintaining substantial fleets of this long-range widebody aircraft. United’s fleet, numbering 22 aircraft, is more frequently deployed across a broader range of long-haul international routes, notably connecting hubs like San Francisco and Newark to destinations in Asia, Europe, and the Middle East. Meanwhile, American Airlines operates 20 aircraft used mainly on routes serving Europe, South America, and Oceania, with a focus on premium market segments.
Data from Cirium indicates that United flights cover more miles and operate in higher volume, with its 777-300ERs servicing the longest routes and executing around 10% more departures in November 2025. American’s fleet is also undergoing upgrades, including new Flagship Suites and premium economy cabins, emphasizing its strategy of combining high-capacity and high-yield service on key routes such as New York to London and Dallas to London.
Both airlines continue to see the Boeing 777-300ER as a vital part of their long-term fleets, expected to serve well into the 2040s due to its reliability, range, and ongoing modernization efforts. The post-pandemic travel landscape has accelerated investments in passenger comfort, with upgrades targeting premium leisure segments. Overall, while United maintains a flight and range advantage, American’s focus on premium experiences aims to maximize profitability on its most demanding routes.
