http://www.flyertalk.com/forum/Forum1/HTML/001292.html
--you can see fares available in each class on each flight when you turn on expert mode (see above link for how) but can't specify the fare class to book in.
On the demise of EasySabre--the only place where you could specify your fare class, there were many threads:
http://talk.flyertalk.com/forum/Forum1/HTML/000995.html
http://talk.flyertalk.com/forum/Forum1/HTML/001132.html
http://talk.flyertalk.com/forum/Forum1/HTML/000742.html
http://talk.flyertalk.com/forum/Forum1/HTML/001322.html
http://talk.flyertalk.com/forum/Forum1/HTML/001543.html
[This message has been edited by BlondeBomber (edited 10-01-1999).]
[This message has been edited by BlondeBomber (edited 06-01-2000).]