a computerized system containing information about, inter alia, air carriers' schedules, availability, fares and related services, with or without facilities through which reservations can be made or tickets may be issued, to the extent that some or all of these services are made available to subscribers

a document which contains a certification confirming that the maintenance work to which it relates has been completed in a satisfactory manner, either in accordance with the approved data and the procedures described in the maintenance organization’s procedures manual or under an equivalent system

a document which contains a certification confirming that the maintenance work to which it relates has been completed in a satisfactory manner, either in accordance with the approved data and the procedures described in the maintenance organization’s procedures manual or under an equivalent system