News Analysis: Longest Airbus A380 Route In The World Is Dubai To Los Angeles (Daily) a route of approximately 7,234 Nm (13,397 Km) (8,324Sm). The Wisdom of using the A380 is based on: the increased Passenger Capacity vis-à-vis a smaller aircraft; Aircraft Fuel Efficiency per Passenger (or Freight) per Mile; Increased Passenger Comfort in flying a much more Spacious Aircraft; Passenger “Perceived” Aircraft Safety (Four Aircraft Engines are Safer than Two), some would Aver.
Emirates Airline has won Professional Acclaim during its life for making some Wise business decisions (such as this, people might Opine).
Reference: http://gulfnews.com/business/aviation/emirates-increases-capacity-on-los-angeles-route-1.1262880