The 777- 200lr and 300er are different because not only are the ranges and general capabilites significantly different than their generic counterparts, but they are physically bigger as well (for example, a 14 foot longer wingspan on the 300er).
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As it is a twinjet, the aircraft is more economical to operate than some larger quadjets, like the Airbus A380 or the Boeing 747. The 777-300ER, despite being powered by only two engines, does not necessarily sacrifice capacity. Air Canada, for example, fits as many as 450 passengers onboard some of its 777-300ERs.
Largest Long-range Twin-engine JetlinerThe flagship of the world's elite airlines, the 777-300ER carries 396 passengers in a standard two-class configuration up to 7,370 nautical miles (13,650 km), on routes spanning, for example, New York to Hong Kong, Singapore to London and Sydney to Los Angeles.
The 777-300ER (ER for Extended Range) is the B-market version of the 777-300. 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 (tail assembly), and engine attachments.
The 777-9 measures 251 ft 8 in (76.72 m) in length, compared with 242 ft 1 in (73.78 m) for the A350-1000. With its folding wingtips, its wingspan is much larger too – at 238 ft 10 in (72.80 m), it has more than 20 feet on the A350.
B777-300ER (new 212 seats)These wide seats all come with a door and boast direct aisle access, alternating between forward- and rear-facing rows to provide the highest level of privacy and comfort available in Business Class.