I purchased tickets for a trip to Seattle a couple months in advance. Then the **airline** changed the flight number, and I was charged a $25 change fee. I called the travel agency, but was told, "nope, doesn't matter who makes the change." Just wow! I will never book another flight through these guys. :(
Tip for consumers: It is entirely inappropriate for a travel agency to charge its customers for changes made that are out of the control of the customer.