The replay version of this game is Gottlieb's 1974 'Sky Jump'. The Add-a-ball version for export to Italy is Gottlieb's 1974 'Sky Dive'. 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.