Adding flight plans to airport in FSX

I want to simply add some flight plans to an airport in FSX using the World of AI models. Alliance airport in Ft. Worth is a maintenance base for American Airlines and I want to have some flights in and out of the airport for AAL aircraft.It is also a FedEX hub and I want to add some 727s there since there are only MD-10s and 11s scheduled right now.How can I either edit the flightplans that came with the World of AI aircraft to add some flights or how can I make a separate file. I'm possibly going to design and update this airport along with the AFCAD so I'm thinking a stand alone traffic file will be better?If someone could just point me in the direction of editing the flightplans text file that would probably help.Brandon