Y-class does not mean full-fare coach on all airlines. On LH for example Y is used for "Discover Europe" tickets available for travellers from overseas to Europe, flying into Europe on non-Staralliance carriers.
On *alliance it is booked in G-class.
Easy, isn't it ?!?
And by the way, unrestricted full-fare coach on LH is booked in H-class.
[This message has been edited by cesco.g (edited 10-13-2000).]