A wearable device for operating one or more aircraft related systems, a device system comprising a plurality of such wearable devices, a system comprising such a wearable device and one or more aircraft related systems, and an aircraft comprising such a device system. The wearable device comprises: a user interface configured to receive a user input and to output information corresponding to the received user input; a system interface to connect the wearable device to the aircraft related systems; and a control unit configured to communicate with the aircraft related systems via the system interface to operate at least one of the aircraft related systems and to receive information from at least one of the aircraft related systems. The user interface is further configured to output the information received from the at least one of the aircraft related systems.