Those bus drivers from car washing bays
One of the major differences between air and road transport is security precautions taken by the former. Air transportation is a delicate business with trained and experienced crews a prerequisite not because it expensive to travel by air and many of those who fly are people of some class in society but the industry demands such standards. Road transport on the other hand kills more people every year and despite the efforts of the Traffic Police there are loops that need to be plugged.