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It will have a range of 9,500 nautical miles

Boeing has started selling a new aircraft family – codenamed 777X – which will feature the world’s longest-range jet for passengers.
The new family will be upgraded versions of Boeing’s popular 777 wide-body jet. Its most popular (and profitable) plane is the 777-300ER, which is a 365-seat jet that launched in 2004.
As for the new 777X family, Boeing has been showing off two members to airlines – the 400-seat 777-9X, and the long-distance 777-8X.
While the 777-9X is meant to be the competitor to the Airbus A350-1000, the 777-8X would be the king of distance with a range of 9,500 nautical miles.
The 777-8X would be the successor to Boeing’s current winner of distance, the 777-200LR.
While long-distance jets are considered a niche (mainly due to the fact that the first few hours of long flights are spent burning fuel to carry even more fuel needed for the remainder of the flight), Boeing plans to offer the plane as an option for long trips from places like the Middle East to South America.
Sales of long-distance jets haven’t been too impressive. For instance, Boeing has only sold 59 777-200LRs since its debut in 2007. However, it has sold 687 short-range 777-300ER planes.
Because of this, Boeing expects to sell more 777-9X jets than 777-8Xs, but the two could go hand-in-hand as the 777-9X’s extra powerful engines and larger wings could give airlines more efficient use of the 777-8X.
The main model of the 777-9X is expected to be in service toward the end of the decade. There’s no word on when the 777-8X will be available.

Source: Yahoo News

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RE: why different?
By Solandri on 5/6/2013 5:03:24 AM , Rating: 4
Typically they shorten the plane (and reduce passenger capacity) to lower the weight. Cargo capacity can also be reduced for an additional center fuel tank. Sometimes they'll enlarge the bulge in the fuselage underneath the wing to store additional fuel. They can also add pods underneath the wings for storing additional fuel, though the name escapes me at the moment.

The idea is to hit a passenger capacity which matches the traffic on a given range. e.g. if about 250 people a day want to fly from New York to Hong Kong, and the only plane you have with that range can carry just 200, then you're stuck either flying two planes or having to give up 50 passengers' worth of revenue. A bigger plane which can seat 300 can be more economical for the route despite flying with 50 empty seats.

RE: why different?
By Jeffk464 on 5/6/2013 9:20:29 AM , Rating: 2
What if next year the average is 270 passengers?

RE: why different?
By amanojaku on 5/6/2013 2:10:46 PM , Rating: 3
pods underneath the wings for storing additional fuel
Drop tanks.

I'd avoid enlarging the fuselage bulge, though. Might give other planes storage envy. ;)

RE: why different?
By e36Jeff on 5/6/2013 4:58:54 PM , Rating: 2
Oddly, in this case the plane is actually longer than the 777-200LR by 19ft. I'd guess they used this extra length to stuff more fuel under the passenger deck. The 777-200LR already has 3 extra fuel tanks compared to other 777's, so it's a safe bet the -8X will keep that. No word on what they did with the wings on the -8X, but the -200LR already has the largest wings in the 777 family(the -200LR shares its wings with the 777f and the -300ER). Its a safe bet they are the same/larger than the -200LR.

RE: why different?
By lwatcdr on 5/7/2013 12:40:43 AM , Rating: 2
They are called area rule bodies and are not often used anymore. Same for bulging the center section because that can mess up your area rule,
Everything else you said is correct. The of the time they take the wing from the stretched model and use the fuselage of the smaller model.

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