Within Columbia, one may make one connection, outbound and again on the return, between the primary carrier (e.g. AA) and any of these airlines: AA/G3/JJ/LA/LP/4M without any charge.

Within the United States, one can may up to 3 connections in each direction (outbound and return) wholly on AA (e.g. one can't connect from UA to AA on this fare).

One cannot fly nonstop from Chicago to New York and have the ticket priced as if you were flying from Chicago to Cleveland to New York.

Your entire itinerary, under this fare, must be via air; you may not - for example - fly from Chicago to Cleveland, drive from Cleveland to NYC, and resume your flying between JFK and Columbia. If you were to do that, you would have to purchase ORD-CLE as a separate domestic trip.