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).
In numerous scenarios, variables such as fares and valid routes often require manual verification at the time of ticket booking, typically using printed manuals and guidebooks. (AJENTS keeps a basic database of the "Top 50" fares for the most common origin-destination combinations, nonetheless).