ByAlexander VolberdingOther than a fear of flying, why do people still ride the bus when airlines offer a cheaper, more efficient alternative? After all, buses are notorious for being foul smelling, cramped, and slow.Why, in the middle of the aviation age, does bus transportation still operate with an average of 18 million passengers annually? The trips last dozens of hours. Often they are overcrowded and delayed.Yet still, Americans still choose to ride them. Why?