the present disclosure relates to a door for a transport means , which structurally provides the largest possible door width . using a movable carrier arm device , the width of the door aperture can be reduced with little complexity from about 42 inches as an additional equipment option to about 34 inches . to this end , the movable , for example , foldable , carrier arm device is provided which , when the door opens , automatically moves from a retracted position to an extended position in order to reduce the door aperture width to a value which has been predetermined for evacuation . afterwards , the extended carrier arm device can be folded in again . in this manner , it may be possible to increase the comfort for the passengers and the crew when the aircraft is in the normal operating state since the carrier arm device provides a greater aperture width in the retracted position .