--- title: "Boeing 777 and 787: how the two long-haul families compare — OnlyPlanes" description: "Boeing 777 and 787 dimensions, variants, engines and cabins: what matters when choosing a flight or assessing an airline network." canonical_url: "https://onlyplanes.ru/en/blog/boeing-777-vs-787-families" last_updated: 2026-10-27 locale: en meta: keywords: "Boeing 777 and 787: how the two long-haul families compare, Aircraft" "og:description": "Boeing 777 and 787 dimensions, variants, engines and cabins: what matters when choosing a flight or assessing an airline network." "og:image": "https://onlyplanes.ru/images/editorial/2026-10-26/boeing-787.webp" "og:image:alt": "British Airways Boeing 787-8 with landing gear extended" "og:title": "Boeing 777 and 787: how the two long-haul families compare" "twitter:description": "Boeing 777 and 787 dimensions, variants, engines and cabins: what matters when choosing a flight or assessing an airline network." "twitter:image": "https://onlyplanes.ru/images/editorial/2026-10-26/boeing-787.webp" "twitter:title": "Boeing 777 and 787: how the two long-haul families compare" --- > Index of every page on this site: [llms.txt](https://onlyplanes.ru/llms.txt) Aircraft # Boeing 777 and 787: how the two long-haul families compareBoeing 777 and 787: how the two long-haul families compare Boeing 777 and 787 dimensions, variants, engines and cabins: what matters when choosing a flight or assessing an airline network. ![British Airways Boeing 787-8 with landing gear extended](https://onlyplanes.ru/images/editorial/2026-10-26/boeing-787.webp) *British Airways Boeing 787-8 before landing at Heathrow.* Passengers choosing a long-haul flight often see either a Boeing 777 or a Boeing 787 on the schedule. Both are twin-engine, twin-aisle airliners used on intercontinental routes. Their similar roles nevertheless conceal differences in size, design generation and cabin layout. Deciding which is better starts with identifying the variant and what matters for the particular journey. An airline considers the number of seats it can sell, operating costs, belly cargo and the fit with demand. A passenger cares about seat width, legroom, noise, lighting and journey time. Those interests overlap, but do not always coincide. A structured comparison makes the differences clearer: start with the families and their dimensions, then consider the route and, finally, the cabin fitted by the chosen airline. ## Compare the individual variants The Boeing 777 designation combines several passenger variants as well as a cargo aircraft. There is a noticeable difference in size and capacity between the short 777-200 and the long 777-300ER. The additional letters ER and LR also have meaning: they refer to versions with certain range capabilities. The 777X family is being developed separately. It would be a mistake to transfer its features to all previously produced Boeing 777s. The Dreamliner has three main passenger variants: the 787-8, 787-9 and 787-10. Their different fuselage lengths suit different capacity requirements. A shorter variant may fly farther than a longer one because capacity and range depend on weight, fuel and payload. The number in the model name is therefore not a simple ranking in which each version improves on the previous one in every respect. ## Dimensions: why longer does not always mean roomier According to Boeing, the 787-8 is about 56.7 metres long, the 787-9 is 62.8 metres long, and the 787-10 is 68.3 metres long. For comparison, the 777-200LR is approximately 63.7 metres long and the 777-300ER is 73.9 metres long. These values already show why it is incorrect to represent any 777 as an equally large aircraft, and any 787 as its smaller copy: the sizes of the individual variants are partially converging. Fuselage length does not translate directly into seat count. Galleys, lavatories, partitions and service areas also occupy space. Business-class seats that convert into full-length beds take up much more room per passenger than economy seating. An airline may fit fewer seats to offer a more premium product, or increase seating density. Two aircraft of the same variant can therefore differ more in passenger capacity than neighbouring variants in the manufacturer’s catalogue. ## Range and loading form one task The maximum range is useful for an initial understanding of the aircraft class, but the actual flight is calculated taking into account specific conditions. Wind, flight direction, weight of passengers and luggage, fuel supply and selected airfields affect the result. An aircraft capable of completing a route at one load may require restrictions at another. The published distance should not be taken as a promise to transport any number of people and cargo within the drawn radius. It is especially important to consider the combination of passengers and commercial cargo. The space under the cabin floor is used for luggage and cargo items, and their weight is included in the overall calculation. On one route, additional cargo helps the economy of the flight, on the other, weight restrictions reduce this opportunity. For this reason, the airline considers the route as a whole: passenger demand, cargo market, seasonality and available schedule must add up to a sustainable operating model. ## Two engines and different generations of equipment Both families have two engines, but the type of power plant depends on the modification. The 787 offers engines from the General Electric GEnx and Rolls-Royce Trent 1000 families. The 777-200LR and 777-300ER use the GE90; earlier variants of the 777 have a different history of engine selection. The name of the aircraft manufacturer therefore does not automatically identify the installed engine, and externally similar aircraft may require different spare parts and maintenance procedures. For the carrier, this choice is related to the existing fleet, training of specialists, stock of units and support conditions. The economic effect occurs at the level of the entire operation. You cannot calculate it only by the advertising percentage of reduction in fuel consumption: you need to know the comparison base, the length of the flight, the number of seats and load. You should be especially careful with statements that compare the new family with the entire previous generation of airliners. ## Dreamliner composite construction One of the most famous features of the 787 is its extensive use of composite materials in its construction. In aviation, the material is selected taking into account weight, strength, behavior under load and maintenance technology. A composite part and a metal part require a different approach to production and repair. Therefore, the word “composite” describes an engineering solution, but does not in itself turn into an assessment of the condition of a particular aircraft or the quality of its operation. For the passenger, the design is noticeable through the conditions inside the cabin. Boeing specifies a design cabin altitude of about 6,000 feet for the 787, as well as large, electronically dimmable windows. Cabin altitude refers to the equivalent of atmospheric pressure maintained inside during flight. It differs from the actual altitude of the aircraft. At the same time, the sensations after a long flight also depend on sleep, the duration of the trip and the individual reaction of the person. ## The seats and interior layout are more important than the overall reputation of the model If comfort on a ten-hour flight is the priority, start with the seat map for the particular service. Check seat positions, the number of seats abreast, the location of lavatories and galleys, and the seat fitted in the chosen class. Even a very modern aircraft can have a cramped economy cabin. Conversely, an older design can offer a comfortable layout after an interior refurbishment and the installation of good passenger systems. A generic promotional cabin photograph may not show the interior used on the flight. An airline can operate several cabin configurations within a single aircraft type, and an aircraft substitution can change the seat map. When booking, the airline’s information about the specific layout and ticket conditions is therefore more useful. The aircraft name remains a valuable clue, but the manufacturer and operator together determine the final passenger experience. ## How families fit into the route network Let's imagine two directions of the same duration. The first one has many passengers flying every day, the second one has less demand, but people are willing to pay for a direct flight. A larger aircraft allows you to carry more people on a single flight, while a smaller capacity reduces the number of seats that need to be sold. The choice depends on schedules, airport slot availability and how confident the airline is in forecasting capacity throughout the year. Sometimes a carrier prefers multiple flights of lower capacity to provide convenient departure times. In another situation, the limited number of slots makes each flight of a large aircraft especially valuable. Added to this are connections, cargo transportation and the presence of reserve aircraft. The Boeing 777 and 787 can therefore complement each other in the same fleet. Their joint use is due to the variety of routes, and not necessarily the search for a single universal winner. ## What to check before your flight The passenger only needs to collect a few specific pieces of information: the exact modification, interior layout, seat type and route duration. If sleep and work are important, you should separately check the capabilities of the selected class, the availability of sockets and the conditions for access to the Internet. When traveling with a child or limited mobility, the location of suitable seats and accessible services are more important. These questions provide more practical value than a general rating of aircraft without specifying the airline. When comparing two tickets, it is useful to evaluate the entire trip: departure time, transfers, baggage and arrival at the desired airport. A comfortable direct flight on one type may be preferable to a complex route on another, even if the second aircraft is newer in design. The Boeing 777 and Boeing 787 offer different combinations of sizes and technologies. The best choice for a passenger appears where the specific cabin and schedule match his trip. 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