In a pinch, a car can just put on its hazards and pull over
The point is you can't just "stop" a plane and wait for someone to figure things out (https://support.google.com/waymo/answer/9449023?hl=en). Whatever the difficulties in dealing with an abnormal situation in a car, it is strictly much more difficult to deal with them in a vehicle constantly fighting the homicidal urge to fall out of the sky.
Also constant urge to fall out of the sky is a helicopter. A plane generally wants to glide.
The easy part is that it largely keeps itself moving, and that you have a thousand times fewer obstacles to avoid.
Both situations are very hard, and both have very hard aspects that only apply to that situation but not the other one. The plane is not "strictly more difficult".
As a car, finding a safe place to stop in an emergency is over a lot faster than in an airplane, but it's far more dangerous per second and per meter.