Hrmm... are you changing the "Departure City Code" or the "Depart" in the "Destinations code". For any changes in this tool, make them in the Depature City Code. Also, it's not necessarily the airport code for some reason. For example, if you want Chicago, enter CHI, not ORD. If you need to find a city code, type the airport code in the Depart box that I refer to above and the city code should pop up just underneath it. Hope that helps!