I think this is more true than not. But also underestimates the technical problem.
Airplanes are not fully autonomous, even in the instrument flight rules system which is highly standardized. You don't have non-standard or non-predictable things. In instrument conditions, only instrument planes and pilots exist. While portions of segments are automated, transitions between segments and phases of flight aren't. It's ripe for automation, yet isn't fully automated.
The automobile environment has more objects thus more density of complexity, more non-standard and non-predictable actors like non-autonomous vehicles along with bicycles, mopeds, pedestrians, etc.
Airplanes are not fully autonomous, even in the instrument flight rules system which is highly standardized. You don't have non-standard or non-predictable things. In instrument conditions, only instrument planes and pilots exist. While portions of segments are automated, transitions between segments and phases of flight aren't. It's ripe for automation, yet isn't fully automated.
The automobile environment has more objects thus more density of complexity, more non-standard and non-predictable actors like non-autonomous vehicles along with bicycles, mopeds, pedestrians, etc.