Just as Flaming Cliffs 3, the A-10C module is part of DCS: World, the component holding all of the different modules together. If you're using Flaming Cliffs 3 with DCS: World, it is possible to run the A-10C module along with it. If you are still using the standalone version of Flaming Cliffs 3, I don't think it is possible to play the A-10 in this.