I know that Wizz Air do something like that. You can pay some amount, and if the flight is delayed by more than 1 hour they will give you a voucher for the tick

I know that Wizz Air do something like that. You can pay some amount, and if the flight is delayed by more than 1 hour they will give you a voucher for the ticket price (I think just the base price) back. The thing is when do you ever just spend €10 on a flight? Once you add in checked luggage, the priority carry on so you can take more than a packet of crisps onboard, assigned seats so you can sit next to whoever else you are flying with, and extra legroom so you don't end up with leg injuries, you are paying closer to €100. These companies are making serious bank.