Cool. I've never done this before.

Is there a website that explains how the codes work? I understand that the letters F Y B Q ... are the fare types, but what are the numbers after those letters for? Q9 doesn't mean there are only NINE available seats at this fare, does it?

Anyways, where can I go to learn more about availability codes, or anything else that a travel agent might see?

Thanks!
Darq