Perhaps it will be of interest that the trend toward elimination of airline system timetables began with Republic Airlines in 1984. They noticed that the thick system timetable was primarily used by airline employees and passengers already in flight who wanted to recheck a connection. Not really worth the cost, which was about $1 a copy even back then. So they substituted a very basic folder showing only city codes and no constructed connections. It was labeled "employee timetable" just to ward off public complaints, but frequent fliers adapted to it very quickly. The "employee" term was then dropped. When Northwest acquired Republic, they soon adopted the same format. Although the paper version disappeared a few year ago, the format survives as a PDF download in the very last Northwest timetables currently in effect. United tried to make the same transition in 1986 but employees raised a ruckus and the big thick book was restored. Isn't it ironic that economical WN held on to this costly luxury for another 23 years!
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