This game is the version of Gottlieb's 1974 'Free Fall' made for export to Italy. The replay version of this game is Gottlieb's 1974 'Sky Jump'. Wayne Neyens told us that the N188PA on the backglass airplane is the registration number of the plane that his son owned around the time of this game. Wayne told the artist to put this number on the backglass airplane as a lark.