This means that, in most cases, variables such as fares and valid routes have to be checked manually at the time the ticket is booked, usually by using printed manuals and guidebooks. (AJENTS does hold a simple database of the "Top 50" fares for the most popular combinations of origin and destination, however).
This implies that, in most instances, variables such as fares and valid routes must be manually verified at the time a ticket is booked, typically through printed manuals and guidebooks. (AJENTS maintains a basic database of the "Top 50" fares for the most common combinations of departure and arrival points, nonetheless).