Patent ID: 8770517

Claim:
An aircraft comprising: an aircraft body containing an aircraft cabin, the aircraft cabin having a longitudinal length between a front of the cabin and a rear of the cabin, and the aircraft cabin having a lateral width between opposite first and second interior sidewalls of the aircraft body, the first and second interior sidewalls extending upwardly and curving laterally toward each other to a roof of the aircraft cabin; a floor surface in the aircraft cabin; a stowage space in the aircraft cabin; a lavatory in the aircraft cabin, the lavatory being positioned in an area available between the stowage space and the first interior sidewall of the aircraft body, the lavatory including a front wall as part of an enclosure of the lavatory, the front wall having a doorway and a door secured to the front wall that can be manually operated to selectively open and close the doorway; the aircraft body first interior sidewall substantially conforming to an outboard portion of the enclosure of the lavatory; an aircraft aft pressure bulkhead substantially conforming to an aft portion of the enclosure of the lavatory; and, an internal inboard wall of the enclosure of the lavatory serving to separate the lavatory and the stowage space, the internal inboard wall having a lower section, an intermediate section and an upper section that are all interconnected, the lower section extending vertically upwardly from the floor surface between a lower area of the lavatory and a lower area of the stowage space to the intermediate section, the intermediate section extending horizontally over the lower area of the stowage space from the lower section to the upper section, and the upper section extending vertically upwardly from the intermediate section between an upper area of the lavatory and an upper area of the stowage space to a roof of the lavatory, whereby a lateral width dimension of the lavatory above the intermediate section is larger than a largest lateral width dimension of the lavatory below the intermediate section.