Originally Posted by Kiwi Flyer
Also try searching the airline alliance forums. Eg Star Alliance has a sticky thread on the fare classes for all *A (that's star alliance!) carriers.
You might also try various websites that were created by other Flyertalkers. Generally, an airlines' fare class definitions are listed on those pages. A list of links can be found here:
http://www.flyertalk.com/talklinks.shtml
aloha