While many aircraft are described as fly-by-wire that does not mean that there is a software interface you can use. Older FBW aircraft are composed of many inde

While many aircraft are described as fly-by-wire that does not mean that there is a software interface you can use. Older FBW aircraft are composed of many independent computers using poorly documented interfaces -- it was never anticipated that someone would later want to add a 3rd party autopilot. The point of the robot pilot is that the only documented interface is the physical one in the cockpit.