Great question — answering as the UphillTech team:
Some airlines like Frontier or Volaris offer "all you can fly" passes with yearly or monthly subscriptions. Thre tend to be a lot of restrictions on routes and availability so often it's not that useful. Many airlines offer "prepaid" ticket for a specific route. Here is an example ( https://www.flytap.com/en-lt/flight-pass ). Again, there are complicated rules and many restrictions, so you need to study the exact terms in details and compare the pass to the "going rate" to figure out whether this makes sense or not. These almost never make sense if you don't live in a hub of the marketing airline. Even if you do, you need to check the conditions really carefully against your needs. By and...
Full answer by Hilmar: https://travel.stackexchange.com/a/184508 (CC BY-SA 4.0).
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