Boeing Interiors............

The 787 will seat 240 in two-class domestic configuration, with a 46-in (116.8 cm) pitch for first class and a 34-in (86.4 cm) pitch for coach class. 

296 passengers can be seated in a high-density 3+2+3 coach arrangement with 36-in (91.4 cm) Business and 32-in (81.3 cm) Coach pitch.

Up to 234 passengers may be seated in a three-class setup that uses 61-in (154.9 cm) pitch in First Class (2+2+2 or 1+2+1), 39-in (99 cm) pitch for Business (2+3+2 or 2+2+2) and 32-in (81.3 cm) for Coach (2+4+2). 

Cabin interior width is approximately 18 feet (547 cm) at armrest, and was increased by 1 inch (2.5 cm) over what was originally planned.

The 787's interior cabin width is a full 15 in (38 cm) greater than that of the Airbus A330 and A340, but 5 in (13 cm) narrower than the proposed A350-800 XWB. 

For economy class in 2+4+2 or 3+2+3 arrangements, seat-bottom widths will be 18.5 in (47 cm), comparable to that found on the Boeing 777. For 3+3+3 seating, the seat widths would be approximately 17.2 in (43.7 cm), the same as those found on the Boeing 737. 

The vast majority of airlines are expected to select the 3+3+3 configuration on the 787.

The cabin windows are larger than others currently on in-service civil air transport (27 cm by 47 cm), with a higher eye level, so passengers can see the horizon, with Electrochromism-based ";auto-dimming" to reduce cabin glare and maintain transparency. 

The Dreamliner cabin is equipped with LED lighting and electronic window shades. 

These are to be supplied by PPG. Light-emitting diode (LED) cabin lighting (three colour) will be used instead of fluorescent tubes, allowing the aircraft to be entirely 'bulbless' and have 128 colour combinations.

A version of Ethernet—Avionics Full-Duplex Switched Ethernet (AFDX) / ARINC 664—will be used to transmit data between the flight deck and aircraft systems. 

The flight deck features LCD multi-function displays, all of which will use an industry standard GUI widget toolkit (Cockpit Display System Interfaces to User Systems / ARINC 661). 

The Lockheed Martin Orion spacecraft will use a glass cockpit derived from Rockwell Collins's 787 flight deck.

Like other Boeing airliners, the 787 will use a yoke instead of a sidestick. The internal pressure will be increased to the equivalent of 6000 feet (1800m) altitude instead of the 8000 feet (2400m) on conventional aircraft. 

According to Boeing, in a joint study with Oklahoma State University, this will significantly improve passenger comfort. 

Higher humidity in the passenger cabin is possible because of the use of composites (which do not corrode). Cabin air is provided by electrically driven compressors using no engine bleed air. 

An advanced cabin air-conditioning system provides better air quality: Ozone is removed from outside air; HEPA filters remove bacteria, viruses and fungi; and a gaseous filtration system removes odours, irritants and gaseous contaminants.

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