The ZED program works like this: instead of trying to figure out 90% of which fare, what airlines is using it is based on the mileage instead. For example, 1-499 is $19, 500-999, $29, 1,000-3,000 and so on up to 5,000 and above. You pay a flat rate based on mileage. BUT - before we all go thinking this is a terrific deal, the flat rate is EXCLUSIVE of applicable taxes. Which means that you still pay US tax, PFC's, segment taxes, departure taxes (up tax, down tax, thumb tax, tic tax). I priced a flight from JFK to ATH (Athens, Greece) on Olympic AT $257 RT. But Alitalia flies the route as well. So you're not stuck with a ticket you can't use on another carrier, as the fares are all the same based on the mileage.
There IS a ZED website, but it's about as useful as a trap door on a life raft. The only things it gives you is a schedule of who flies the route and little smiley faces that indicate your chances of getting on the flight (but they all look identical, so it's not much help). No fare info and very little in the way of help. (Hmmm...a friend of mine had a python named "ZED." I wonder if there's a connection...).