I normally use flight controllers in quadcopters, but you can use them for airplanes too, there are a handful of benefits when using an fc in a fixed wing, like stabilization, osd in your fpv system, ...

Learn to fly r/c model airplanes with this realistic flight simulator! RC-AirSim has been used successfully by many r/c pilots to learn how to fly a model airplane. RC-AirSim has more realistic flight ...