United Airlines is suspending service on two major international routes. United will suspend daily service from Chicago’s O’Hare International Airport (ORD) to Hong Kong (HKG) on Sept. 8, and suspend daily service between Newark Liberty International Airport (EWR) and Buenos Aires, Argentina (EZE) on Oct. 26, sources said. The reasons for suspending service on both routes has to do with notable drop-offs in traffic on the routes, sources said. In the case of Hong Kong, a route United has…