I am new to this forum and am interested in getting discount tixs, and/or upgrades. There is an article in the Washington Post about codeshare QUP and YUP but unclear of how to access them. Is there a site that defines all the different sharecodes, which ones are cheaper and how to access them, and how to find out the best ways to get the most frequent flyer miles? Looking through web sites it lists fare codes but they all look foreign to me and I don't have a code to decipher them with. I would appreciate any help.

Thanks!