AHH yes ZED, my airline UAL just signed its first agreement for ZED fares with LH.

1) You need to know the mileage between the cities your are traveling.
2) You need to know what ZED fare you qualify for.
I.E. On LH I qualify for ZED LOW fares, YZL=Economy ZED Low and CZL Business ZED Low. My mother qualifies for YZH=Economy ZED High.
3) The ZED fare zone list.

An example for FRA-ATH follows

FRA-ATH= 1129 miles the chart reads


________________YZL_|_YZM_|_YZH__
600-1600 miles $21 | $30 | $42

So you get a fare of $21US for a one-way ticket from FRA-ATH this does not include taxes and fees. I was able to figure these out buy looking up the ID95 price and deducting the cost of the fare from the total.