If there are program-related associated Web pages, a TV receiver 1000 acquires the content information of the associated Web pages from a Web server 2000 and stores it in a Web page storage unit 1006. Hardware keys are configured to input numbers and characters, and are selectively operable in a first mode to input a destination number to the communication section in order to communicate with the destination, and in a second mode to input data to the input field. In some of these embodiments, the passenger aircraft further includes input devices. A file system checker may validate one node at a time or a group of nodes contemporaneously. A back seat vent door is configured to open and close the back set vent opening.