No software will set it up for you. But, there are several utilities that will assist you in creating the required text files and then compile them and place them into your FSX/Scenery/World folder.
Essentially, you create three files. One is a flightplan of scheduled takeoffs from one airport and flights at a set altitude to another airport, with times for takeoff and landing. A second is a list of airports that the AI will use. A third is a list of the AI aircraft's configuration file entires.
There are several utility programs out there to ease the burden of creating and compiling these files. However, none are truly automatic and do require a small degree of study to learn exactly how they work. But, it is not particularly difficult either, and once you learn how to do it, then creating your own AI traffic at your chosen airports really becomes a lot of fun. Just remember that for an AI to function, it needs to have a parking spot and a properly set up taxi routing to the runway. FSX did not do this for the military airfields -- something that I wish had been done but it seems that Aces wanted a military-free zone in FS.
So, if you want AI at military airports, you are also going to have to use any one of several utilities to layout parking spots and also ensure taxi routes are properly laid out. Then, you take the modified airport and either add it to your FSX/Scenery/World folder, or put it in your FSX/Addon folder and then add it to your FSX Library. You add scenery to the library by starting FSX, clicking the Scenery button, and then pathing to the folder and putting it into the list of scenery in the library.
Ken