United Airlines focuses rare widebody operations at two key hubs

From Washington Dulles Airport, which serves Washington D.C., United holds a significant market share of about 70%. Flights from this hub include daily services to São Paulo in Brazil; Paris-Charles de Gaulle; Madrid; Lisbon; Zurich; and Honolulu.

Interestingly, United's domestic flights using the Boeing 767-400ER are among its longest and shortest scheduled routes for June. The flight from Washington Dulles to Honolulu spans an average distance of 4,817 miles—longer than any European destination—while the shortest route is between Newark Liberty and San Juan at just over 1,600 miles.

United's fleet configuration for the Boeing 767-400ER includes seating for business class (34 seats), premium economy (24 seats), and economy class (173 seats). The airline plans to phase out its aging fleets of both Boeing 767-300ERs and -400ERs by the end of this decade.

Delta Air Lines also operates a fleet of Boeing 767s but has more examples than United. Delta is gradually replacing its older models with newer Airbus widebody aircraft while continuing to operate their full complement of -400ERs alongside United.

Boeing's production focus has shifted away from passenger versions of certain models like the Boeing 767 due to newer options like the Boeing 787 Dreamliner offering better efficiency and range capabilities. The remaining orders for freighter versions are expected to be fulfilled by around mid-decade before production concludes entirely.