In May 2004 Boeing delivered the first 777-300ER, which carries 386 passengers with a range of 7,825 nautical miles (14,490 km).
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The extended-range 777-300ER, with a MTOW of 700,000–775,000 lb (318–352 t), entered service in 2004, the longer-range 777-200LR in 2006, and the 777F freighter in 2009.
Unsurpassed Reliability. The 777-300ER is the most reliable twin aisle flying today. It has the highest schedule reliability of any twin aisle airplane at 99.5 percent – the airplane is on time, nearly all the time.
Which Seats to Avoid. First, I'd avoid any seats up against a bulkhead wall (typically in the last row of a cabin), since recline will be limited. That includes seats 51A and B (pictured above), along with 51K and L. In this category, you'll also want to skip 22DEFG, 37ABC, 37DEFG, 37JKL and the four seats in row 52.
The Boeing 777 is larger than the 787 and thus can carry more passengers. Even comparing the largest 787-10 to the 777-200ER puts it ahead only by 17 seats while shedding significant range. The 777-300ER leads the Dreamliners with 396 seats and almost the same range as the 787-9.
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.
The Boeing 777–300 was released after the 777–200ER variant. Now with the era of quad-jets coming to an end, airlines were looking for airliners that could replace the range, without a sacrifice in capacity. The -300 sacrificed range for capacity, which made the 777–200ER a better replacement for a340's and 747's.
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 777-8 is slightly smaller than the 777-300ER, and the 777-9 is slightly bigger. The main differences are in the design, technologies, and efficiencies. They are not things many passengers will necessarily note, but it's something the airlines will. The smaller of the 777Xs, the 777-8 is just under 70 meters long.
The Boeing 787 has similar safety features to the 777, but also features improvements such as a wider and longer aisle space for passengers and smoother engine takeoff capability which can reduce air turbulence and improve safety during takeoffs.