I thought this was obvious. The complexity that cars deal with during travel is many orders of magnitude higher than the complexity aircraft deal with, and cars

I thought this was obvious. The complexity that cars deal with during travel is many orders of magnitude higher than the complexity aircraft deal with, and cars actually have an effect on the complexity of the environment they travel in, unlike aircraft. For the most part, aircraft one have ONE object that they have to avoid hitting, and it's the size of a planet, and engages in zero direction changes. Aircraft are simple.