Again with the drone thing... It either MUST have AI or it MUST have a remote pilot via datalink; perhaps a little bit of both, but I cannot see one that does not ultimately rely on data linking for at least SOME functionality. That means a radio, with all of the associated issues. What if the aircraft flies into thick WX? We've all heard radios crap themselves in a TRW.

AI suitable for complete autonomy isn't available, won't be for a long time.

Imagine even a simple problem like a flap/slat issue. Combine that with a bit of nasty WX, or maybe an ill passenger, or ATC issues, and the decision tree is going to become very complex, very quickly.

It is easy to program a simple drone to go from A to B, and it works when everything works perfectly. It doesn't do so well when there are problems. A LOT of drones have gone down in the lat 15 years.