The long-range, twin-aisle 777 holds about 365 passengers, making it Boeing's second-biggest plane. Since its first flight in 1994, it has been a best-seller for Boeing, which has sold more 777s than any of its other current large planes.
In May, it began offering the revamped 777X. Boeing is still finalizing plans for the plane -- aiming to deliver the first aircraft by the end of the decade -- but it has said it is expected to carry as many as 400 passengers and to be 20 percent more fuel efficient than the current 777.
Previously, Lufthansa had made a commitment for 34 of the 777X.
The air show is also giving Dubai a chance to display its huge new airport south of the city, which officially opened last month but is still under construction in some areas. Plans calls for some of the traffic from Dubai's current airport to be eventually shifted to the new Maktoum International facility, which officials say could one day handle 160 million passengers a year as part of the region's growing profile as a global aviation hub.In the Middle East, 40,000 pilots and 53,000 technicians will be needed in the next two decades to keep up with demand, according to a Boeing forecast.