Boeing 777X

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Boeing 777X
Role Wide-body jet airliner
National origin United States
Manufacturer Boeing Commercial Airplanes
Status Under development
Unit cost
777-8X: US$360.5 million[1]
777-9X: US$388.7 million[1]
Developed from Boeing 777

The Boeing 777X is a new series of the Boeing 777 family under development. The 777X will have two variants; the 777-8X and the 777-9X. Boeing states that the aircraft will be "the largest and most-efficient twin engine jet in the world".[2] The 777X will feature new engines, new composite wings, and technologies from the Boeing 787. It is intended to compete with the Airbus A350.


777X proposal[edit]

In September 2011, Boeing released more details on proposed new 777 versions, tentatively designated 777-8X and 777-9X, and collectively referred to as 777X.[3] The 777-9X would feature extended horizontal stabilizers compared to the -300ER and a fuselage stretch of 7.0 ft (2.13 m) to a total length of 250 ft 11 in (76.5 m) to accommodate 407 passengers.[4][5] The 777-9X's planned length exceeds the 250 ft 2 in (76.3 m) length of the Boeing 747-8, currently the world's longest airliner. Wingspan was expected to increase from the current 212 ft 7 in (64.8 m) to 234 ft (71.3 m), and incorporate the use of carbon-fiber-reinforced polymer in its construction.[3][6] In addition, gross weight was tentatively slated to decrease slightly from the current 775,000 lb (352,000 kg) to approximately 759,000 lb (344,000 kg) for the −9X model.[4] Boeing was also studying an ultra long-range replacement for the 777-200LR, conceptually dubbed the 777-8LX, which would share the –9X's fuel capacity and gross weight. Its range will be 9,480 nmi (10,910 mi; 17,560 km) compared to 9,395 nmi (10,812 mi; 17,400 km) for the −200LR.[4] The 777-8LX's fuselage length would match that of the proposed −8X at 228.17 ft (69.5 m).[3] Preliminary estimates placed entry into service for the first 777X variants at around 2019.[7][8]

In February 2012, General Electric disclosed studies on a slightly smaller engine, dubbed the General Electric GE9X, to power the 777X. It was to feature the same fan diameter from the GE90-115B (128 in or 325 cm) and a thrust decrease to new ratings of 99,500 lbf (443 kN) per engine for the –9X and –8XL, and 88,000 lbf (390 kN) for the –8X.[9][10][11] Rolls-Royce and Pratt & Whitney also proposed powerplants for the 777X, including the RB3025 concept, based off the Trent 1000 and Trent XWB engines, and an adaptation of PW1000G engine architecture to produce up to 100,000 lbf (440 kN) of thrust.[3] However, in March 2013, the GE9X was selected as the exclusive engine to power the 777X.[12] GE subsequently updated the GE9X specifications to reflect growing concerns that the 777X would be underpowered. Design changes included an increase of thrust to 102,000 lbf (450 kN), and then up to 105,000 lbf (470 kN)[13] with a new fan diameter of 132 in (335 cm), giving the new engine the largest fan GE has ever produced.[14][15][16] In August 2012, a report in the Seattle Times stated that Boeing had slowed 777X development, but still planned for it to begin service by about 2019.[17]

The decision to offer the aircraft with only one engine is somewhat controversial. But the airlines bemoan the loss of competition among engine makers; Steven Udvar-Hazy, CEO of Air Lease Corp., said that he wants a choice of engines. Airbus has pointed out that equipping a commercial aircraft to handle more than one type of engine adds millions of dollars to the purchase price. A Pratt & Whitney executive told the Wall Street Journal, "Engines are no longer commodities...the optimization of the engine and the aircraft becomes more relevant."[18]

777X program[edit]

In May 2013, Boeing's board of directors gave formal permission for its Commercial Airplanes division to start offering the 777X to customers.[19] On September 18, 2013, Lufthansa's supervisory board gave approval to order 34 Boeing 777-9X aircraft to replace its 747-400s. At the time, Boeing was reportedly planning to launch the 777X series later in 2013.[20][21][22] In October 2013, Boeing announced that its U.S. facilities in Charleston, Huntsville, Long Beach, Philadelphia, and St. Louis as well as Russian facilities in Moscow would support the 777X design effort.[23]

View of airport tarmac with terminal building and multiple airliners parked adjacent to it.
A row of Emirates 777s at Dubai International Airport. The carrier is one of the launch customers of the 777X.

Boeing officially launched the 777X at the 2013 Dubai Airshow in November 2013, announcing a total of 259 orders and commitments worth more than US$95 billion.[24][25] According to Boeing, this was the largest product launch by dollar value in the history of commercial aviation.[26] The 777X program includes two models: the 777-9X, which is stretched beyond the length of the 777-300ER, and the 777-8X, which is sized close to the 777-300ER but with ultra-long range capability.[27] In addition to the 34 aircraft commitment from Lufthansa in September 2013, Boeing received orders and commitments at the Dubai Airshow for 150 aircraft from Emirates, 25 aircraft from Etihad Airways and 50 aircraft from Qatar Airways.[24][27][28] In December 2013, Cathay Pacific ordered 21 777-9X airliners with deliveries in 2021-2024.[29] Emirates finalized its order for 150 777X aircraft, consisting of 115 777-9Xs and 35 777-8Xs in July 2014.[30]

Because deliveries of the 777X are not expected to begin until 2020, Boeing faces the challenge of maintaining an efficient production line for its existing 777 models. With 380 777s on order as of the end of 2013, and no orders booked at the most recent air show, in Singapore in February 2014, Boeing was trying to support a production rate of 100 aircraft per year on that line. To stimulate additional orders and bridge the gap until 777X models roll off the assembly line, Boeing vice president of sales John Wojick proposed pairing 777X sales with sales of current generation models, and providing opportunities for passenger airlines to sell its used 777 aircraft for conversion to freighter aircraft. The airlines could then purchase new 777 passenger aircraft.[31] By April 2014, with cumulative sales surpassing those of the 747, the 777 became the best-selling wide-body airliner; at existing production rates, the aircraft was on track to become the most-delivered wide-body aircraft by mid-2016.[32]


Design plans call for the 777X to feature cabin design details that were originally introduced on the Boeing 787 Dreamliner. These include larger windows than prior commercial aircraft, increased cabin pressure equivalent to 6,000 feet (1,800 m) altitude, higher ceilings and more humidity.[33] Structural changes are required versus the original 777 fuselage design in order to incorporate these design improvements.[33]



The 777-8X is similar in length as the 777-300ER with seating for about 350 passengers in a three-class configuration and has a range of 9,300 nmi (17,200 km) or more. It is to take the place of the -200LR and be a direct competitor to the Airbus A350-1000.[13][27][34] The internal cabin width will be greater to make a 10 abreast configuration in economy more comfortable at 19 ft 7 in (5.97 m) versus the 5.86 m width of previous 777 models.[13] Boeing has just released a configuration that will allow for 45.72 cm (18.0 in) wide seats at 10 abreast economy.[35]


The 777-9X is a further stretched variant with seating for about 407 passengers in a three-class configuration and a range of more than 8,200 nmi (15,200 km). Boeing states that it will have "no competitor in its market segment".[13][21] The 777-9X is to begin production in 2017 and enter service in 2020.[27] The 777-8X's more spacious cabin interior width of 19 ft 7 in (5.97 m) is shared by the 777-9X.[13] As with the 8X version, Boeing has just released a configuration that will allow for 45.72 cm (18.0 in) wide seats at 10 abreast economy.[35]



Orders and deliveries summary[edit]

Boeing 777X orders and deliveries by type
Total orders[40] Total deliveries
777-8X 42 –-
777-9X 244 –-
Total 286 -
Boeing 777X orders and deliveries by year
2013 2014 Total
Orders 66 220 286
Deliveries -


Specifications by model
Model 777-8X[27][34][41] 777-9X[27][34][41]
Cockpit crew Two
Seating capacity,
353 (3-class) 407 (3-class)
Length 228 ft 2 in (69.5 m) 250 ft 11 in (76.5 m)
Wingspan Unfolded: 235 ft 6 in (71.8 m)[42]
Folded: 212 ft 8 in (64.8 m)
Wing sweepback TBA
Tail height 64 ft 6 in (19.7 m)[43]
Cabin width 19 ft 7 in (5.97 m)[13]
Seat width 18 in (45.7 cm) in 10 abreast economy[35]
Fuselage width 20 ft 4 in (6.20 m)
Maximum cargo capacity 40× LD3 48× LD3
Operating empty weight TBA
Maximum landing weight TBA
Maximum takeoff weight 775,000 lb
(351,500 kg)[44]
Typical cruise speed TBA
Maximum speed TBA
Maximum range
> 9,300 nmi
(17,224 km, 10,702 mi)
> 8,200 nmi
(15,186 km, 9,436 mi)
Takeoff distance at MTOW
(sea level, ISA)
Maximum fuel capacity TBA
Service ceiling 43,100 ft (13,140 m)
Engine (×2) General Electric GE9X
Thrust (×2) 105,000 lbf (470 kN)[13]

Notes: Data for the 777X are preliminary.

See also[edit]

Related development
Aircraft of comparable role, configuration and era
Related lists


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  2. ^ "Boeing 777X fact sheet" Boeing, June 2013.
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External links[edit]