At the moment, the biggest issue with automation is not 'complete' automation. It may well get there one day, but the software will need to be at the point where it is perfect and the programmers have thought of EVERYTHING, or come up with an AI that can handle EVERYTHING.... That is not negotiable and they've got quite some distance to go until things improve massively, or we could just simply decide to accept airliners biting the dust with a lot more regularity than they do now!
We are a long, long, long way from pilotless airliners and this is certainly not the environment for AI to learn as it goes.......!
There will only ever be the one crash of a pilotless airliner anyway - who in their right mind would set foot on one afterwards???