I know I've seen a number of articles on this, but I can't seem to get the right search to find them via google. I won't bother you with details because I don't want someone to do my homework for me. I'm just looking for a primer (MP or FT posts, blogs), since I can't get it to work. It would be on AA from Europe to DFW, ideally adding a leg to Costa Rica or Belize. Business Saaver. At this point the flights aren't available (for June 2013), but I want to be informed if we choose to do it. If I can get some references, and I still can't figure it out, then I'll come back and ask some (hopefully) informed questions. Thanks!