The story
The Tarifverbund Passepartout was founded in 1986 and offered cross-cantonal seasonal tickets from 1988. From 2002, single tickets for the so-called core zone around Lucerne were also introduced under the name Integraler Tarifverbund in der Agglomeration Luzern. From 13 December 2009, the single ticket service was extended to the entirety of the cantons of Lucerne, Obwalden and Nidwalden. This meant that zone tickets could now be purchased instead of the previously standard route tickets and the Tarifverbund Passepartout fare network became an integral fare network. At the same time, the management of the fare network was transferred to the newly founded Verkehrsverbund Luzern from 2010. The division of the network area into 78 zones for single tickets and 36 zones for season tickets, which was introduced in 2009, was replaced by a new zone map with 29 fare zones that apply to both ticket types as of the timetable change on 14 December 2014.
From Wikipedia’s article on Tarifverbund Passepartout, shared under CC BY-SA 4.0.4