> Aircraft typically carry hundreds of people and can crash to the ground. Cars are more numerous and could spontaneously either plow into pedestrians, or rear

> Aircraft typically carry hundreds of people and can crash to the ground. Cars are more numerous and could spontaneously either plow into pedestrians, or rear-end someone, causing chain damage and, quite often, a spillage of toxic chemicals (e.g., a cistern carrying acid/fuel/pesticide). Plus, you have a problem of hostile actors having easier access to cars compared to planes.