The Boeing 787 Dreamliner's cabin configuration varies significantly by airline, but it typically features a three-class or four-class layout designed for long-haul comfort. The most common classes are First Class (offering fully enclosed suites with doors on select premium carriers), Business Class (usually featuring "lie-flat" seats in a 1-2-1 configuration for direct aisle access), Premium Economy (which offers wider seats and extra legroom), and Standard Economy (typically in a 3-3-3 configuration). Some airlines, like United, use specific branding such as United Polaris for Business Class and United Premium Plus for their premium economy offering. The Dreamliner is famous for its passenger-centric design, including much larger, electronically dimmable windows, higher cabin humidity to reduce "jet lag" symptoms, and a lower cabin altitude pressure that makes the flight feel less taxing on the body. In 2026, many carriers are also introducing "Smart Seats" in economy that feature larger 18.5-inch touchscreens and USB-C charging ports at every seat, making the Dreamliner one of the most technologically advanced and comfortable aircraft in modern commercial aviation fleets.