Aircraft cabin

An aircraft cabin comprising:

• an aisle defining an aisle axis,
• a plurality of aircraft passenger seats arranged in a seat column adjacent the aisle, and accessible from the aisle, each aircraft passenger seat comprising a seat pan and a backrest with a front face defining a seat facing direction and a rear face, and each aircraft passenger seat being convertible between a seat configuration and a bed configuration, wherein the rear face of the backrest faces towards the aisle,
• wherein each aircraft passenger seat in the seat column is able to be angled away from the aisle such that the seat facing direction is at an angle of at least 30 degrees from the aisle axis, wherein each aircraft passenger seat can be in the bed configuration when at that angle, and wherein each of the plurality of aircraft passenger seats is part of an aircraft passenger accommodation unit, the unit further comprising a shell, the shell comprising a main shell portion and a rear shell portion at least partially surrounding the rear face of the backrest, wherein the rear shell portion is moveable with respect to the main shell portion between a closed position, in which the rear shell portion blocks an access path between the aisle and the seat, and an open position, in which the rear shell portion does not block the access path between the aisle and the seat, wherein, when the rear shell portion is in the closed position, the rear shell portion is adjacent the rear face of the backrest, and wherein, when the rear shell portion is in the open position, the rear shell portion is pivotally moved from the closed position in a direction away from the rear face of the backrest.