Qatar Airways has ordered a total of 27 777 Airplane Model with options for five additional airplanes. Qatar also has ordered 30 787 model Dreamliners and holds 30 options.
The 777-300ER ("ER" for Extended Range) is the B-market version of the -300. It features raked and extended wingtips, a new main landing gear, reinforced nose gear, and extra fuel tanks. The -300ER also has a strengthened fuselage, wings, empennage, and engine attachments. The standard GE90-115B turbofans are the world's most powerful jet engines in service, with a maximum thrust of 115,300 lbf (513 kN). The maximum range is 7,930 nautical miles (14,690 km),[138] made possible due to a higher MTOW along with the increased fuel capacity. The -300ER can fly approximately 34 percent farther than the -300 with a full load of passengers and cargo. Following flight testing, the implementation of engine, wing, and weight modifications produced an added 1.4 percent reduction in fuel consumption.
The first -300ER was delivered to Air France on April 29, 2004. The -300ER ranks as the best-selling 777 Airplane Models variant, having surpassed the -200ER in July 2010, and since its launch the model has been a primary driver of the twinjet's sales past the rival A340. Using only two engines produces a typical operating cost advantage of around 8-9 percent for the -300ER over the A340-600, along with a 20 percent fuel burn advantage over the 747-400. Several airlines have acquired the -300ER as a 747-400 replacement amid rising fuel prices. As of July 2010, -300ER deliveries to 21 different customers were 246, with 186 unfilled orders. Operators had 237 aircraft in service as of July 2010. The -300ER's direct Airbus competitor is the A340-600 model HGW.
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