An aircraft includes interchangeable, wirelessly controllable electrical or electronic functional units provided for use by passengers and associated with a seat or group of seats. The aircraft further includes installation sites for the functional units, each installation site being associated with one seat or a group of seats. The functional units are removable such that they can be installed and uninstalled in the installation sites or replaced during maintenance work without forfeiting the operational approval of the aircraft. Each functional unit includes an RFID reader operating in a contactless manner to identify the installation site of the functional unit and a device for the wireless transmission of the identified installation site to a database of the aircraft. An RFID tag is associated with each installation site and contains information readable by the RFID reader to identify the associated seat or group of seats.