Kev, it's mileage based. Lower for coach and increases for business and first. International is more as well. However, after 5 years, it is free coach domestic. After 25 years it is free coach international and discounted everywhere else. I.E. domestic first is like half price after 25 years. International first and business are also cheaper after 25 years. More or less, they take the coach charge and minus that from the first and business charge to get the 25 year price. It works, could be better. I don't travel much on AA since I live in an after thought city. I'm on other carriers which are free anyway. Seems like an ok system. People have choices of prices to pay and you get charged only for what you use. Also, everyone one of your eligible family members flies at the same rate as the employee.