Buenos Aires BUE to Washington, DC WAS flight with Avianca

United Airlines, established in 1926, is a major U.S. airline headquartered in Chicago, Illinois. Operating an extensive domestic and international network, United serves more destinations than any other airline, connecting travelers across six continents. The airline's eight hubs include Chicago–O'Hare, Denver, Houston–Intercontinental, Los Angeles, Newark, San Francisco, Washington–Dulles, and Guam. As a founding member of the Star Alliance, United offers a comprehensive range of services, including regional flights through United Express, catering to both leisure and business travelers. The airline is committed to sustainability, investing in sustainable aviation fuel and innovative technologies to reduce its environmental impact.

Avianca is the national and largest airline of Colombia, and one of the oldest airlines in the world, tracing its origins back to 1919. It serves as the flagship of a group of airlines across the Americas, operating under a codesharing system. Avianca boasts an extensive network of destinations throughout the Americas, with its main hub located at El Dorado International Airport in Bogotá. The airline is a member of the Star Alliance, offering various classes of service from economy to business and first-class. Its fleet includes modern aircraft such as the Airbus A320 family, Airbus A330, and Boeing 787 Dreamliner.