Interesting Things You Did Not Know About The Boeing 777X

The 777X is due to enter service in 2022. It is the highest capacity twin-engine aircraft yet developed and has already proved popular with airlines, with 350 orders as of July 2020.

This guide takes an in-depth look at the 777X. It will pick out some of the most interesting details about the model and the 777X development project, as well as highlighting why it stands out from other aircraft.

Boeing 777X Test Flight Getty Images
Thew new Boeing 777X has a lot to offer. Photo: Getty Images

The latest Boeing aircraft – the 777X

The Boeing 777 has been the best selling widebody aircraft to date. It first flew in 1994 and now, 25 years later, it is getting a replacement: the 777X.

The latest member of the 777 family, now its third generation, brings with it a lot of improvements. It will carry more people, and fly further than previous versions. And it still maintains much in common with the 777-200 and 777-300, both structurally and operationally.

If offers a lot, and should undoubtedly help Boeing refresh its image after the 737 MAX problems, and position it well going forward to compete with the A350 and A380.

Stay informed: Sign up for our daily aviation news digest

qatar airways boeing 777-300ER Getty Images
The 777 has been the best selling widebody to date. Photo: Getty Images

So, what are some of the most interesting details about the 777X and its development so far?

It has the highest capacity of any twin-engine aircraft

According to Boeing, the 777-9 will offer a typical two-class seating capacity of 426. This is the largest of any twin-engine aircraft to date. For comparison, the A350-900 offers 315 and the A350-1000 369. The 777-300 has a capacity of 368.

The 777-9 offers the highest capacity of any twin yet. Photo: Boeing

It is closer to the capacity of some four-engine aircraft. The A340-600 (the largest A340 variant) offers a two-class capacity of 440. And the 747-8 has a typical three-class capacity of 467. The gap between four and two engine aircraft has been narrowing for some time. With ETOPS improvements, there are limited areas that twins cannot fly. And with engine improvements, larger airframes are achieving higher capacities.

The 777 was a significant factor in the demise of the A340. Given the rate at which the other quadjets are being retired, it looks like the 777X will have a similar effect on the remaining four-engine models.

The 777X has folding wingtips

A first amongst commercial aircraft, the 777X will feature wingtips that fold when on the ground. This will bring several advantages. The longer wings allow for more efficient in-flight operations, and folding them on the ground means it can access more airports.

777X folding wing
The 777X folding wingtips. Photo: Dan Nevill via Wikimedia

Extended, the wings offer a span of 71.75 meters. Larger wings improve the aerodynamics and efficiency of the aircraft. But, when on the ground, they can be folded to 64.8 meters. This is the same as the 777’s wingspan and allows the 777X to use the same taxiway and gate facilities.

It is only the second time that Boeing has redesigned the wing on an existing aircraft. It first did this with the 737, introducing a new wing design for the Next Generation series.

Boeing 777X
The 777X with its folding wingtip. Photo: Jay Singh – Simple Flying

One of the difficulties faced by the Airbus A380 was its size and the limits this placed on airport operations. It is categorized in the largest of the six groups defined by FAA’s Airplane Design Group (ADG), severely limiting the airports where it can operate. The folding wings keep the 777X in the second largest group.

With a wingspan of almost 80 meters, the A380 faces restrictions on where it can operate. Photo: Getty Images

There are two versions of the 777X

Boeing is offering two versions of the 777X. The 777-9 is the larger variant and will launch first. This has started test flights and is due to enter service with Emirates in 2022.

The 777-8 is a shorter version (69.8 meters compared with 76.7 meters). It will have lower passenger capacity but a higher range. Its range of 16,170 kilometers will make it a suitable replacement for the 777-200LR and a strong competitor for the A350-1000 (with a range of 16,100 kilometers).

It should especially appeal to Middle Eastern operators wanting to fly to the US west coast. It has yet to start construction, with the start of development being pushed back to 2021.

Boeing 777X
The two versions of the 777X. Photo: Boeing

According to data from Boeing, this is how the two variants compare:

  • 777-8: 384 passengers to a range of 8,730 nm / 16,170 km
  • 777-9: 426 passengers to a range of 7,285 nm / 13,500 km

Boeing may develop a larger variant

Boeing has also proposed a larger version of the 777X. The 777-10 would be stretched by 3.5 meters over the 777-9, adding four more rows. This would be the world’s longest commercial aircraft.

It would compete well against the A380 or even a potential further stretch of the A350.

As yet, though, there is no confirmation it will go ahead. Boeing made some comments about it at the Farnborough Air Show in 2016. Boeing Commercial Airplanes chief executive Ray Conner told FlightGlobal:

“We have the ability to do it. If somebody wanted more capacity, that’s a pretty straightforward deal for us to do.”

The 777X has been purchased by eight airlines so far

As of July 2020, 350 aircraft have been ordered by eight airlines. These are:

  • Emirates (156 aircraft)
  • Qatar Airways (60 aircraft)
  • Etihad Airways (25 aircraft)
  • Cathay Pacific (21 aircraft)
  • Singapore Airlines (20 aircraft)
  • ANA (20 aircraft)
  • Lufthansa (20 aircraft)
  • British Airways (18 aircraft)
Qatar Boeing 777-300 Getty
Qatar Airways has confirmed it will retire its 777 aircraft by 2024, to replace it with the 777X.  Photo: Getty Images

Emirates ordered 150 aircraft

Middle Eastern airline Emirates placed the largest order for the 777X. It ordered 150 aircraft in July 2014 – 35 Boeing 777-8s and 115 Boeing 777-9s. This was not just the largest order for the 777X, but it is one of the largest ever single orders for commercial aircraft (based on value) at $76 billion list price.

Since then, Emirates has amended its order, switching 30 aircraft to Boeing 787-9 Dreamliners. There have also been discouraging comments from Emirates’ President Sir Tim Clark regarding its future needs. According to Executive Traveller, he said in June 2020:

“We are nowhere near confident enough that the economics, the cash flows, the bottom line will put us in a good position to be able to guess if we’ll buy a hundred of this or a hundred of that.”

Emirates 777X
An Emirates 777X under development. Photo: Jay Singh – Simple Flying

It has an aluminum, rather than a composite, fuselage

The 777X will retain an aluminum fuselage, rather than a lighter composite structure as used on the 787, and the competing A350.

Boeing has defended this choice (as reported by Bloomberg), explaining that its focus has been on improving the popular 777 and introducing a derivate rather than a brand new aircraft. This is a strategy it also follows for the 737 family. The metal fuselage of the 777X will be heavier, but this is compensated for by the new engines and wing design.

For a good discussion of the differences between aluminum and composure construction, see this article.

TUI 787 damaged
The Boeing 787 introduced a composite lighter fuselage, but the 777 series will retain an aluminum construction. Photo: Getty Images

It has a wider cabin than the 777

The cabin width is increased four inches over the 777 through thinner walls and more efficient insulation. This will be especially noticeable in economy and premium economy classes, where the extra width is not enough to add an extra seat, but should allow a bit of extra seat width. Airlines will most likely go with a 10 across economy layout but will have some extra space to use.

777-9 seating
The extra cabin width should allow for some seating updates (this is a 777-9 cabin mockup). Photo: Boeing

Any extra width will help achieve a spacious feeling for passengers. But Boeing hopes to go further with the 777X and improve on passenger feeling and comfort. As reported by CNN, Boeing cabin experience and revenue analysis regional director, Kent Craver explained:

“We’ve learned a lot since the 777 was first introduced in the 1990s, especially a lot into human psychology during travel… We use lighting and the architecture to create not only physical space, which is finite, but a sense of spaciousness – so on a psychological level.”

Large passenger windows

The 777X will feature larger passenger windows than the 777, giving more light in the cabin and better viewing for passengers. On the 777 windows are 140 square inches, and on the A350, they are 125 square inches. The 777X has 162 square inch windows.

The windows are also placed higher in the fuselage to increase viewing. They will also feature the same electronic dimming technology as used on the 787.

They will not be as large, though, as the 787 windows. These are the largest of any commercial aircraft, made possible by the composite fuselage which is more resistant to fatigue.

Boeing 787 windows
The 787 has the largest windows of any commercial aircraft. The 777X will be smaller than these, but larger than the average. Photo: Getty Images

It will be pressurized to a lower altitude

Raising the pressure inside the cabin has been one of the most significant developments for passengers in recent years. It leads to a more comfortable flight, with fewer jetlag effects. With a simulated lower altitude, the air is denser, and it is easier for the body to oxygenate itself.

Most aircraft cabins are pressurized to 8,000 feet. Boeing lowered that for the 787 to 6,000 feet. It will use similar pressurization for the 777X. This is despite the fact the 777X has an aluminum fuselage as opposed to the composite fuselage of the 787.

In theory, the increased air pressure in the cabin will place greater stress on the aluminum airframe and reduce its service life (which is why we have not typically seen this with other aircraft). Boeing believes though that they can achieve this with the 777X. In reporting by Business Insider, Boeing’s Kent Craver explained,

“We also understand the requirements of the lower cabin altitude in terms of cycles and pressures on the fuselage. As a result, we can achieve it with a few local reinforcements and change those loads out to accommodate lower cabin altitude.”

More luggage space in the cabin

And one more area that Boeing will aim to improve the passenger experience is with luggage storage. The 777X will add larger overhead bins, allowing luggage to be loaded on its side. This may sound like a small change, but with bags in the cabin increasing as airlines introduce new baggage pricing strategies, having more space, and easier access to luggage during the flight, will be an advantage.

777X Passenger Overhead Bins
Boeing is advertising larger overhead bins on the 777X designed to carry more bags in the cabin. Photo: Boeing

It will be the flagship offering for many airlines

One of the most exciting aspects for passengers will be the flagship status of the 777X with airlines. Many airlines will install their most up to date seating, and some are introducing new premium cabins for it. Some examples include:

  • British Airways has confirmed it will install its new Club Suite on the 777X. This is an excellent, upgraded business class that features suite-style seats with partial doors.
  • Lufthansa will launch a new business class product with the 777X, featuring open seats but in a more spacious layout than used on other aircraft.
777X Business
The 777-9 will get a brand new business class product. Photo: Lufthansa
  • Singapore Airlines already has some of the best business and first-class products, and there is a possibility that it will develop new ones for the 777X, although this is not yet confirmed.
  • Emirates will adopt a similar seat to that used in business class on its A380 aircraft. This is a distinct improvement from its offering on the 777, with 1-2-1 seating as opposed to 2-3-2. It will also debut a new premium economy seat and will use its new 777 first class.
Emirates first class suite
Emirates’ new first class suite will also appear on the 777X. Photo: Emirates
  • Qatar Airways is looking at installing an ultra-premium first class. This would only be on some of its 777-9 aircraft, and most likely serving European routes. The launch could coincide with the retirement of its A380s around 2028.

The 777X has the most powerful engines to date

The 777X uses new General Electric GE9X engines. General Electric designed the GE9X engine specifically for the 777X, derived from their GE90 engine used on the 777. It offers 134,300 pounds of thrust, a new world record for a commercial engine (according to General Electric’s report). The previous record was held by the GE90 engine, at 127,900 pounds.

Getty 777X GE9X
The GE9X engine on a 777X test aircraft. Photo: Getty Images

Changes with the GE9X engine include a larger diameter fan with fewer blades (16 instead of 22), use of lighter carbon fiber composite materials, and a higher bypass ratio (offering better propulsion efficiency). These changes help to reduce the weight of the engine and allow for its larger size.

These engines are enormous as well as powerful. At 13 feet in diameter, it is wider than the fuselage of the Boeing 737.

GE9X Lufthansa
The GE9X is the largest engine of any commercial aircraft. Photo: Lufthansa

It is more efficient than other aircraft

Despite the largest engines, highest capacity, and huge range, the 777X will be an extremely efficient aircraft. It offers a cost per seat 13% lower than the 777-300ER and 33% lower than the 747-400 (according to an analysis by The Air Current).

It is hard to compare efficiency with other aircraft until it is in service. Boeing, however, claims that the 777-8 will offer 4% lower operating costs than the A350-1000 and the 777-9 up to 11% lower costs. Forbes, in its analysis of this, points out that this becomes more significant if airlines adopt the higher capacity and higher cargo capacity model and think in terms of a carbon footprint per capita.

But Simple Flying did look at this previously and found (based on predicted range and fuel burn) the two aircraft would have similar fuel burn per seat. The real test of this, however, will come later.

It is expensive

All these features, however, come at a price. The 777-9 lists at $425.8 million, compared to $361.5 million for the 777-300ER, and $418 million for the 747-8. It is Boeing’s most expensive aircraft to date.

But Airbus takes top place for the most expensive aircraft, with the A380 list price of $445.6 million. More importantly, though, the A350-1000 comes in lower at $366 million.

Of course, most airlines negotiate prices lower than the list price. With Airbus, this is often around 50% lower, as Simple Flying looked at previously.

Early testing did not go too well

Testing of the 777X began in 2019, with the first test flights taking place in early 2020. These flights were delayed after problems with the GE9X engines, and issues with structural testing.

A number of test flights have taken place in 2020. Photo: Boeing

In September 2019, the fuselage was ripped apart during stress testing. This occurred close to the maximum stress levels (99% of the target), and the rapid depressurization of the fuselage caused the damage. The test aircraft was written off, but the test does not need to be repeated, and Boeing claims it did not have an impact on schedules.

Testing Lufthansa
Before flying, the fuselage is subject to rigorous testing Photo: Lufthansa

There could be a freighter version of the 777X

There are no official plans for a freighter version of the 777X as yet, just the two passenger versions. In a communication in 2015, however, Boeing discussed a possible freight version based on the 777-8 airframe, following 18-24 months after the passenger 777-8.

777X models
Boeing may base a freighter version on the shorter 777-8 version, but not until around 2025. Photo: Getty Images

There is support from airlines too. At the Paris Air Show in 2019, Qatar Airways expressed its desire for a 777X freighter to be made available, and the willingness to be the launch customer (as reported by FlightGlobal). Qatar Airways chief executive Akbar Al Baker explained his thinking:

“By 2025, our initial freighters will be getting about 10 years old, so we will need to replace them. Hopefully, Boeing will launch a 777X-based freighter.”

Qatar Paris Air show
Qatar Airways has offered to be the launch customer of a 777X freighter Photo: Getty Images.

Boeing already dominates the cargo market, with the 777 and 747 freighter versions. A logical expansion would be to do so for the 777X, with all of its engine and efficiency benefits.

There is certainly space in the market. In reporting in the cargo industry publication Cargo Forwarder, Boeing claims that an additional 1,040 widebody freighters will be needed in the coming 20 years.

And with the crisis in 2020, there has been an increased demand for cargo aircraft, with several airlines converting passenger aircraft for cargo use, and even possibly a cargo A380. Perhaps this could be the right time for Boeing to launch a cargo version of the 777X?

What do you think of the 777X? Are there any more details you would like to share or find out more about? Let us know in the comments.