Upvote:3
According to user @Calchas:
Almost every network airline offers some kind of a bundle pass for its regular commuters. Off the top of my head, [the following airlines] sell these kind of bulk-purchase tickets. Some of them are not sold directly but only through specialist agents like OptionTown. Most of them are not stand-out deals if you are a bargain hunter but might save you a lot of money if you are the kind of person who often has to be at a certain place at a certain time.