FREEDOM/FUN etc. were AC's (ex) proprietary names for different types of fare. This was their "simplified" system. However, beneath that level, each of those fares contained a number of different fare buckets with different prices and slightly different rules. For the average customer it didn't make too much difference, but for the folks around here it could be important. So Freedom was synonomous with Y. Check the sticky at the top for more info.