I recently came across this series of articles online that is an Airline Fare basic primer. The information was written between July 2009 and January 2010 so some of the details of the information may be dated but the general overview is quite informative. For those who are new to the business of Airline Fares, there is great information related to one-ways vs round trips, stop-overs, open jaws, circle trips, researching fares and a host of other information. It has been beneficial to me and I believe will help anyone who needs an introduction to the foreign language of Airline Fares and Mileage Runs. http://www.planestrainsandrunning.com/p/old-posts-airline-fare-school.html FYI: I do not know the person behind this website and gain nothing from anyone visiting. I just wanted to pass along what I thought may be a beneficial resource for many.