Most other forums include a fare class directory, which shows the relevant "families", i.e. groups of fare which have the same kind of service, earning etc.

As far as AB/HG in Europe is concerned, I understand that there are three economy class fare families:

- semi-flex (rebookable for a fee, non-refundable) low mileage earning: 250 miles intra european/125 miles domestic
- semi-flex (rebookable for a fee, non-refundable) high mileage earning: 1000 miles intra european/500 miles domestic
- full flex (rebookable/refundable for free): 1500 miles intra european/750 miles domestic

However, I have no clue what booking classes relate to these groups.

Can somebody help with this? Thanks.