An aircraft includes a plurality of control targets, avionics devices and a control switch unit. The control targets each includes a power line communication unit configured to perform communication via a power line. The avionics devices are respectively connected with the control targets via exclusive-use signal lines. The avionics devices are configured to control the control targets via the signal lines. The avionics devices each includes a PLC unit configured to perform communication via the power line. The control switch unit is configured to, when an abnormality occurs in any of the avionics devices, cause another one of the avionics devices to control the control target which has been controlled by the any of the avionics devices, via the power line.