A method, user equipment and application server for adding media stream of multimedia session. A plurality of devices disposed in the rack are identified, wherein each device receives power from one of the PDUs, and wherein the plurality of devices are server nodes, network switches or external data storage devices. A biometric template of the passenger is acquired by the reading device at the check-in station and forwarded to the departure area station. The power distribution manager provides one or more operating voltages and, in response to the processing demand, switches between a first set of voltages and a second set of voltages without halting the processing system.