Wheels are really awesome at fighting gravity when the engine dies so I’m not sure I ever see a time people are flying around in personal aircraft en masse. I’ve seen enough try to drive on the ground.
Additionally, autonomous flight is fairly common right now. There's less going on in the air than on the ground (or rather less surprises with small response time and high consequences). Planes even land and take off by themselves. The first plane to actually be certified to autoland was in 1968[0]. The tech has been around for awhile and been making serious development this entire time.
Autonomous flight is still quite rare. And even when it is used, there are still human pilots standing by to take over in case anything goes wrong.
FTFY.
I'm just saying that comparing autonomous flight to autonomous driving isn't fair. Flying is a lot easier for a machine. You already have tons of data streaming in from airports, other planes, and lots of equipment on the vehicle itself.
All your NNs are entirely completely utterly pointless when faced with inputs they have never been trained on. They always suck at extrapolating, and almost always suck at interpolating as well. So when an unexpected emergency happens, what exactly are they going to do?
And outside of NNs, The only thing we have are autopilots. They sometimes fail, and that is why real pilots mainly just babysit them as their main job.