wide-body

A wide-body aircraft has a fuselage diameter wide enough to accommodate two rows of seats side-by-side in the main deck, typically with six to ten seats across economy class. The cabin width is generally 6.1 to 6.5 meters inside, compared to 3.5 to 3.8 meters on narrow-body jets. This single structural feature defines the category: the airframe itself must be engineered and certified for that diameter, which affects everything from pressurization loads to door placement and emergency evacuation requirements.

Common wide-bodies in service include the Boeing 777 (three-three-three in economy), the Airbus A350 (nine across), and the Boeing 787 Dreamliner (nine or ten across depending on configuration). The Airbus A380 is a double-deck wide-body, with independent upper and lower main decks, seating up to 853 passengers in an all-economy layout. All of these aircraft are built around that fundamental fuselage diameter that allows side-by-side dual-aisle cabins, or upper and lower decks on the A380.

For maintenance, wide-body designation matters because structural inspection intervals, repair patch sizing, and pressurization test procedures all scale with fuselage diameter. Service bulletins and airworthiness directives often distinguish between narrow and wide-body aircraft. Access panels are larger and more frequent on wide-bodies, and the greater internal volume means longer water and waste system runs, more complex environmental control ducting, and more extensive wiring looms. Fatigue crack propagation also behaves differently in larger-diameter cylinders under the same pressure cycling.

The term originated simply from the visible difference: when a Boeing 747 first flew in 1969, its 6.5-meter cabin was dramatically wider than the 3.76-meter fuselage of the 707. Airlines and engineers needed language to sort these aircraft by category, since payload, range, and operational economics differed radically. The narrow-body versus wide-body split became the industry standard for aircraft classification, and the terminology persists even though modern designs have blurred some boundaries.

Wide-body aircraft typically operate on long-haul international routes where passenger volume and cargo capacity justify higher fuel burn and airport fees. Maintenance bases must stock different tooling, spare parts inventories, and qualified technicians for wide-body and narrow-body fleets; cross-training exists but structural work is often type-specific. Hangar infrastructure also differs: a wide-body needs more ground width for sustained maintenance, and elevated work platforms must extend farther out.