I am glad that people are noticing what's happening to passenger being packed like sardines.  Why not have different sized planes and those that want to be packed in like sardines and pay less can be  and those that need more space, comfort for a variety of reasons (health, clausterphobia, anxiety, panic...) can pay more for comfort and health.  We read about bizarre and aggressive behaviours on planes but don't realize that it may be due to severe anxiety, panic attacks, etc.. If we want to look at it psychologically we know that crowding makes people uncomfortable, irritable and aggressive.  Mental healthwise and physical healthwise airlines are losing a lot of people who who want to fly  but can't because they suffer from panic attacks and clausterphobia on flights (this is a huge and willing population that wants travel).  We have  look at more all encompassing solutions than let's just make the planes smaller, decrease the price of tickets and then charge more for everything extra